In order to solve the problem of roof and rib controlling of large mining height and island working face in three-soft coal seam in Xiaokang mine, the difference of roof controlling between island and normal working face were analyzed and contrasted based on the method of theoretical analysis and numerical modeling. The hydraulic support parameters were optimized. The results show that the stress, displacement, failure zone in island working face were more than the normal working face due to the influence of the both sides of the gob, which leaded to the difficult controlling of roof and rib. Based on the curve of supporting intensity and roof subside displacement, the supporting intensity of hydraulic support should not less than 1.3MPa. The setting load of hydraulic support should more than 1.0MPa through analyzing the curve of the setting load and rib horizontal displacement. The hydraulic support’s type is ZY13500/31/65, which adopted the telescopic girder and face guard structure. The height of the face guard is 3m. The structure of raising the base was designed to improve the adaptation to the floor.

Based on the working face during the retreat, vulnerable to the effect of the roof caving and the coal wall help. Through introducing the technology of flexible mesh, which was applied to replace the steel mesh in pavement and mesh connection technique, to simplify the terminal process of the roof pavement and reduce the labor intensity of miners and the risk coefficient. The applying of the technology was improved the rate of the coal resources utilization and the efficiency of the mining terminal. The technology of flexible mesh for similar fully mechanized face under the condition of rapid retreat has good reference value.

Through the survey of 20 engineering projects of corrupted joint of shaft and shaft bottom, we found some problems such as the lack of geological conditions、unreasonable structure、design flaws、non-standard constructions exist in the process of design and construction. This paper summarized the engineering project’s damage form, and analyzed the damage characteristics, discussed the reasons of damage from the geological conditions、structure、design、and construction, the analysis showed that most of the damage of joint of shaft and shaft bottom can be prevented and avoided.

Aiming at the problem of narrow pillar design for roadway driving along goaf of short-distance coal seams group, using the methods of theoretical analysis and numerical simulation, the relationship among the rock deformation of roadway driving along goaf of short-distance coal seams group, the law of surrounding rock stress distribution, the stability of narrow coal pillar and the pillar width is studied. The study results show that the reasonable coal pillar width range is between five meters and eight meters under the condition of the project, The results have references to reasonable pillar design for roadway driving along goaf with similar conditions.

In order to realize the scientization , intelligentization and rapidity of equipments type selection in the geological conditions of complex working face, a set of mining equipment selection criterion was summarized according to field experience and statistical data, the equipment selection criteria was more quantitative, and the inference engine was programmed by LabVIEW tools, the equipment database was called by program to select the reasonable equipment to adapt to the working conditions

In mine industrial site such as deserts, the Gobi desert, grassland, as the natural terrain is too flat, local drainage direction is not clear, for industrial site vertical design brings a certain degree of difficulty.By surface model of the type of terrain, clear direction of the drainage of the site;Using different height projection surface of the terrain below, determine the site low control elevation; Finally taking the site General layout flat soil surface1 and flat-field gradients, optimized site vertical design and earthworks.

In order to study the design of the ground gas drainage borehole casing in the deep alluvium region ,this paper from the establishment of the model, the work load of the selected casing, the choose of casing stability calculation formula and other aspects to study. The results showed that: from the permanent use considerations, Casing force model is similar to the drilling shaft ,so it can refer to the drilling shaft design, consider its use phase loads suffered; according to the thin-walled cylinder theory, pointing out that gas drainage borehole casing using high-strength steel is unreasonable from the perspective of force analysis; from the aspect of force and construction considerations, the safety factor of the ground gas drainage borehole wall-casing and work-casing in the deep alluvium region should be different considerations.

Based on the selection of mining technology in a open-pit mine, do some calculation and analysis on the comprehensive energy consumption and the cost of fuel and dynamic of discontinuous mining system and semi-continuous mining system, according to general specification, quota and practical application of equipment. The study showed that the highest ratio of energy consumption and operation cost is the transport link, so it will be the point link on the energy-saving and benefit increase; The point of process optimization for semi-continuous mining system is to reduce or cancel the distance of truck transportation, improve the utilization efficiency of belt conveyor. Under the existing pricing system the operation cost of semi-continuous mining system is better than discontinuous mining system, so it should be extended.

By analyzing the work principle of the Hydraulic Coupler,and the advantages and disadvantages of Torque-limited Hydraulic Coupler,Velocity Modulated Hydraulic Coupler in controlling belt conveyor,comparing the cost-effective of Torque-limited Hydraulic Coupler with Velocity Modulated Hydraulic Coupler. Selecting of soft-start equipment in the coal preparation plant is depending on the character of belt conveyor is proposed.At last,the suggestions that Hydraulic Coupler is prior option when reducing the investment in the coal preparation.

Based on Sha La Ji Da coal industry area as an example, combined with sandy area unique natural landscape, according to the project construction requirements and construction conditions, on the industrial site layout and vertical design, expounds the sandy area layout design optimization ideas and the need to focus on problems; and the former factory district as the focus, deep analysis, to provide references for future desert and Gobi wind sand area the industrial site of the general layout design.

To study on the freezing wall temperature field by masonry concrete wall in deep soft rock strata within rich water, field test and regression analysis were combined to do the research. a mine shaft was choosen to monitor the temperature field in Mongolia and Shaanxi Provinces during excavation, the results show that: The freezing Well help in soft rock thawed largest range of between 400 ~ 600mm, occurring in the pouring of concrete 7d, freeze soft rock maximum melt distance S and well help temperature T presented a linear relationship;Well help soft rock all over again refreezed in the 12 ~ 52d, soft rock all over again refreezing time D and well help temperature T showed a linear relationship. Research that, to ensure the strength of concrete pouring 7d, the well help temperature should be controlled above the -4.9 ℃, the temperature into the mold of concrete higher than 16 ℃.

The roadway layout in eight mining area of Chensilou coal mine designs that through the large and medium-sized fault to decorate production system. In order to minimizing the rock tunnel construction quantities, ensuring the safety of tunnel construction at the same time, the paper using the advanced detection on longer distance, grouting reconstruction limestone aquifer, grouting seal rock fissure, the highest strength supporting methods on soft and broken surrounding rocks, to optimizing the design scheme, and enhancing the compressive strength of surrounding rock near the fault, blocked limestone aquifer water channel. The coal mine has obtained the good effect in the engineering practice later.

according to -702m for horizontal rail haulage wear seams Lot: rock crushing, to stress, work conditions and poor support problems, the analysis of the original support programs and the lack of surrounding rock deformation and failure characteristics based on the combination roadway actual occurrence situation, put forward the "anchor - Network - cable - spray - Note - shed" control scheme, pressure observation showed that: support Schemes effect is obvious, rock has been effectively controlled, supporting effect good research on the broken rock, unstable rock roadway project with a reference value.

With the increasing of mining depth in our country, the deformation control of deep soft rock roadway has become extremely difficult, and the repairing reinforcement problem of soft rock failed roadway is becoming increasingly serious. Aiming at the control problem that serious deformation and failure of the south soft rock roadway in Yangcheng coal mine, the characters of surrounding rock was revealed by field investigation and drilling TV detection in this paper. Based on the principle of bolting and grouting support, the bolt- grouting repairing reinforcement technology that high strength prestressed bolt active support around all the cross section, grouting pipe and long grouting anchor reinforcement, and backfill the overbreak floor base bolt- grouting support was raised. In addition, the support parameters and technology was designed reasonably. Finally practical engineering showed that this repairing reinforcement technology could control the surrounding rock deformation and failure effectively and ensured long-term stability of roadway. This repairing reinforcement technology can be popularized in similar failed roadway repairing project.

The old room and pillar mining methods were commonly used by the local medium and small coal mines in Yuyang district of northern Shaanxi province. There is bigger security hidden danger at coal pillar stability, which had affected later replacement mining of coal pillars. Based on the long time effect analysis of coal pillars, the paper pointed that the long-term stability of narrow coal pillar in “mining 12 remaining 8” was better than that of rectangular coal pillar in room and pillar mining. The good stability of strip coal pillar has given the basic condition under the premise of the later guaranteed mining technology and capital in strip mining. On this basis, the paper has given a working face ventilation method of replacement mining, a filling method, and a specific mining way of advancing filling and back coal pillar replacement. The study has provided a kind of mentality for coal pillar stability and increasing the rate of recovery in protecting water mining at northern Shaanxi province, and had a certain significance.

The view that the overlying key strata come into being long-span inverted cantilever structure with coal mining face advancing is proposed by analyzing the datum from the observation of coal mining stress of No.12314 fully mechanized coal mining face in Huojitu pit of Daliuta Mine and researching the hydraulic powered support jammed mechanism and process of elementary mining in the No.12314 face for guiding the production of the face in a shallow buried seam with ultra closed distance to the above seam safely and effectively. The cantilever structure of overlying key strata break up and then happen to be instable due to sliding reversely as a result of the instability of boundary coal pillar near the open-off cut of the above seam since the working face go beyond the boundary goaf coal pillar of above seam. The hydraulic powered support jammed accident occurred due to the upper load transferring to the brackets in the working face at a short time. Some targeted treatment measures are proposed from the aspects of technology, design, locale management and etc, which provides technical support and gathers experience for the production of the face in a shallow buried seam with ultra closed distance to the above seam safely and effectively.

In order to grasp the spontaneous combustion laws of 42 coal seam in Buertai Coal Mine. CO can be used as the index gas of 42 coal seam for early prediction of spontaneous combustion. The measurement of spontaneous combustion "three zones" of goaf for 42103 fully mechanized coal face was applied. The ranges of the oxidizing band of coal spontaneous combustion of 42 coal seam are 37-136 m for intake airways and 18-115 m for retrurn airways from working face to deep of goaf based on the standard of critical concentration of O2. According to the results of spontaneous combustion dangerous area analysis in the goaf, the paper put forward the pertinence measures for 42 coal seam in different exploitation periods.

Aiming at the control problem of consumption in heavy medium of heavy medium coal preparation plant, combined with the Huo-er-xin-he coal preparation plant mediated consumption control in practical experience, using a combination of theoretical analysis and production practice of severely the quality of medium, the medium consumption in preparation products, magnetic medium recovery medium consumption and integrated management of several means consumption aspects analysis the production system in the influence of dielectric loss of main factors and find out the control medium consumption of specific methods, and practical operation experience. Through the concrete implementation of the medium consumption control measures, heavy medium consumption can reduce the production cost and improve the production efficiency by reducing the coal consumption of 0.5kg/t coal.

Abstract: TinNan coalmine in order to control the roof caving and coal Wall caving of frequent accidents at the large mining depth and high cutting height fully mechanized mining face, We are Systematic furnished the strata pressure behavior law of Face and entry and the case of roof caving and coal Wall caving, and the effect of entry support. Data by analyzing the strata pressure behavior law and its distribution characteristics for roof, and analysis the adaptation of support, gives cave basic prevention measures to help the accident. Observations suggest that an intense strata pressure behavior at 205 large mining depth and high cutting height mining face, large deformation large convergence in the mining gateway and large sphere of influence of the lead abutment pressure. it provide a theoretical basis For mine safety and efficient production and a reference for other coalmine in the same mining area.

In order to explore the pressure law when fully mechanized mining workface going under slice pillar in close distance coal seams and study the method to control the roof which can prevent roof accidents, the method of field observation and theory analysis were studied in this paper. In two kinds of conditions which were the beginning of mining and common mining were studied in this paper. During the observation and Analysis on coal pillar of rock pressure, the pressure law of fully mechanized mining workface going under slice pillar showed out. The roof structure was also been studied and a lot of roof control methods were raised which successfully guided the field production. These results has enriched the roof control method of special fully mechanized working face geological special conditions.

In order to obtain the mining response characteristic of permeability of gas-filled coal, the paper studied the mining response mechanism of permeability deeply by using the combining methods of theoretical analysis, numerical simulation and field test. Starting from the basic definition of porosity, the paper established the mining response model of permeability based on volumetric strain by using Kozeny-Carman equation. The paper simulated variation of the permeability in the process of coal mining based on the mining response model of permeability by using COMSOL Multiphysics and studied the mining response of permeability in the field. The results show that mining is the key controlling factor affecting coal permeability, the variation of volumetric strain, permeability and gas flow is consistent affected by mining, the swelling deformation of coal and permeability increases gradually as the approaching of the working face and reaches a maximum near the working face. The permeability of the return airway side seam is greater than that of haulage roadway at the same location away from the face, and the closer the coal face the greater permeability.

Slurry water-hammer is a kind of unstable flow in the process of the pipeline，which will generate larger additional pressure, and has greatly effect of damage to the pipeline. The simulation by FLUENT software can dynamically and intuitively to express the slurry-water hammer pressure and the speed change process；Theoretical calculation has limitations, and can only make a static expression. According to the comparison of the two, the pressure wave velocity can better meet the situation, the pressure field has some gap to a certain extent. Studying on the slurry water-hammer has greatly significance to the pipeline transportation, and has strong reference value to put forward to alleviate the pulp strike and destruction in the future.

Probability integration method has extensive application in mining subsidence prediction, while the accuracy of result mostly depends on the reliability of the parameters. This paper has a discuss on the inversion method for getting the predicting parameters using the calculation software 1stOpt for mathematical optimization, and then this method is carried out by three examples. The result shows that this method ,with simple operation and high accuracy, need not the initial value and greatly reduces the difficulty in getting the parameters.

This paper proposes a K-means based algorithm to identify the interface of coal and rock. Firstly, we use wavelet transform to extract large-scale features in coal-rock images, which eliminates spurious textures and imaging noise and thus facilitates the subsequent clustering process. Then, the K-means algorithm is applied to complete the clustering of coal-rock interface distribution. Finally, image edges are extracted from the clustered binary image using the Canny operator, and two image morphological operators, erosion and dilation, are used to connect adjacent segments and smooth the boundaries. The experimental results of simulated and real images show that our algorithm is more accurate to extract the true coal-rock boundaries, compared with the direct K-means and Mean-shift image segmentation algorithms. The proposed algorithm is more promising to the autonomous long arm mining applications.

Papers of lifting wavelet transform on the coal bunker radar level meter signal noise reduction research, analyzes the various wavelet to threshold selection method.This paper proposes a new noise reduction method of threshold value, and the proposed method has carried on the simulation.The results show that the new method can effectively improve the SNR of signal, reduce the root mean square error signal.

In this paper, four kinds of collectors are used as a collector in the flotation of difficult floated coal slime with high content fine clay, and the related mechanism was analyzed. The progressive release experiment, contact goniometer, micro calorimeter and infrared spectroscopy were applied to study and compare the collector performance of the four different collectors，and the adsorption mechanism of coal and different collectors was discussed. The results indicate that the wetting heat , contact angle, combustible recovery and the flotation activity of the four collectors decrease in the order as follows:1#collector＞ 2#collector＞ 3#collector＞kerosene collector. The infrared spectroscopy demonstrated that the role between collectors and coal can be considered as physical adsorption，the radical group ＞C=O of collectors could increase its collector performance.

Abstract: The article summarizes the main reason causing the bottleneck of information sharing among the coal industry enterprises, according to the information islands phenomenon in the sharing of information and resource of coal industries, and compares the advantages of grid technology relative to traditional distributed systems, and puts forward the scheme of using grid service to eliminate information resource island, and proposals technical requirements of information resource sharing system based on service grid combined the features and advantages of OGSA grid, and chooses open grid services architecture to design the information resources sharing system of coal industry, and gives it’s design plan and program implementation details.

A high precious and controllable constant current module is designed, basing on the principle of single-ended flyback switching power supply. Then, the detailed design and calculation process of some key circuit parameters are proposed. Finally an experiment is taken to test its constant current accuracy and controllability. In addition, this module can be used for excitation signal transmission systems of DC resistivity method, induced polarization method and other different electrical advanced detection methods.

Aiming at the risks in the course of coal enterprise mergers and acquisitions(M&A),this paper identified the M&A risk factors in the coal enterprise recognition, and used structural equation model to construct M&A risk factors analysis model of the coal enterprise, and then make the questionnaire to collect data to carry on the fitting of the model, determine the key risk factors of coal enterprise M&A, so as to take measures for raising the effect of coal enterprise M&A in our country for reference.

On the basis of the comprehensive analysis of the five factors (4M1E) in the impact of construction quality of Building Engineering, with deep research on the Man factor in the important role of 4M1E, the paper reached a conclusion that the Man factor is the primary factor influencing the construction quality, and put forward the countermeasures to control the Man factor effectively. In the process of construction supervising of engineering project, the supervisors should put the control of the Man factor as the key factor for controlling 4M1E. Facts prove that, seizing the Man factor as the key with pre-controlling it comprehensively in the process of construction, the effective control of construction quality can be achieved.