The paper analyzed the problem of ventilation system in the Baijigou mining, proposed the program of optimal modification which recycling and closed level tunnel first and recycling rise and dip entry according to the principle of segment recovery and section closing, and demonstrated the feasibility of the program. After construction of optimal modification, the optimal modification achieved good results: the mine obtained a reasonable ventilation mode, mining area got a relatively independent and stable ventilation, and the production system of the mining was simplified, achieved the mining layout of one surface in one of mining,and received nearly 500 million direct economic benefits.

Abstract：Roadheader is the primary equipment for the laneway excavation. In this paper, cutting head and the numerical simulation model are established by ANSYS/LS-DYNA10.0 to resolve cutting vibration problems and the loads on each picks of the cutting head are quite different for a company roadheader. Through the simulation, the external forces on cutting head and picks are obtained. According to the situation by forces, difference coefficient for the external forces on cutting head and picks tends to balance by means of several adjustments and optimizations of cutting line spacing between picks. Meanwhile, for the difference coefficient decreases, the vibration for roadheader has been effectively controlled, the cutting performance was improved obviously.

Overview of coal preparation plant design management in coal preparation plant design institute, Introduction Coal Preparation design project information management system carry on, From holistic perspective, defining coal preparation plant design project management information system architecture, Analysis the way to building the project framework. using of WBS node, design a flexible method to decompose project. Give a complete image progress of the task weights and algorithms. Discussed problems solve during the system promotion.

Coal conveying gantry is significantly affected by seismic load. Basic on seismic calculation and analysis of three structural models, Optimization solution of seismic design for section arrangement, span of trust and support are putted forward. Through the study of actual design case, Optimization solution has significant economic benefits.

It is difficult to support soft-rock roadway because of its low strength、easily disturbance、plasticity and continuous flows etc. It becomes more complex that the soft-rock roadway is in the deep mine. According to the fact, we take the mining roadway Ding5-6-22170 of the sixth-mines at Zhong Ping Energy Chemical Group as an example. By peering method with drilling, the failure and deformed situation of surrounding rock is analyzed in the soft-rock roadway. Based on it, the supporting scheme is put forward and applied successfully. So it brings the great effects. There is the pragmatic value in this article which can provide the example for the same roadway supporting.

Aiming at the actuality of plentiful pressed coal under buildings and environment polluted by the piled coal refuse on the ground in our country, this paper takes Yang Dong coal mine of Fengfeng group under building as an example, filling lane width and isolation coal pillar width, are determined by numerical simulation. The results show that the coal refuse backfilling technology under building can be good to solve the environmental pollution and raise recovery rate. Application of refuse backfilling technology carries out new mining technology and methods, to accelerate the process of building eco-mine and to achieve the sustainable development of mining industry. As the increasing of this mine’s production, it can bring to mine district with remarkable economic and social performance.

+535m level is the design production level of Xin’an Coal Mine. Due to complex geological conditions and large tectonic stress, most of the roadway projects come out serious deformation failure, which severely affects the safe production of mine. Based on the analysis of deformation failure characteristics of deep tunnel instability, the key technology to control the deformation failure of deep tunnel is put forward, and reasonable supporting technical parameters are confirmed. Therefore, the long-term stability of deep tunnel engineering is assured, and the need of safe production in coal mine is satisfied. Through the cable (two pallets) and the Combined Support RC +535 main crossing point on the 3rd test section after six months of observation, the deformation of surrounding rock is small, and the deformation rate has been three consecutive months tends to zero, which directly show that the proposed supporting technical solutions is right. Proposed control technology for reducing the workload of Coal mine roadway maintenance and construction investment has key significance

Based on how to solve the problem of gas concentration exceeding limits in the mining process, the technology of improving gas drainage effect from the grossmeasures boreholes by high-pressure water jet cutting was carried out. In the paper, the mechanism of high-pressure water jet cutting was analyzed,the high-pressure water jet slotting system and equipments and technology,as well as the test in coal mine were introduced. The exposed area of coal seams and the stress-relief scope were increaed after the boreholes drilled by high-pressure water jet cutting, the average rate of gas production for each borehole has increased up to 2 times, gas drainage efficiency has been significantly improved.

Abstract: At the present time, although the new vertical shaft adopts composite shaft lining which is composite of double-layer laminated plastic in reinforced concrete wall structure when supporting freezing shaft wall, it has not resolved the problem of leakage water of freezing shaft wall, and it will becomes more serious. This paper against water disasters technical problems that leaking water of full-depth freezing shaft sidewall and frozen tube inrushing water in numberⅠoverhaul channel of skip loading cavern 471.8m mileage position of shaft of Shaanxi bin-chang group company Hu jia he mine coal, analyzed and studied the reason of shaft sidewall leakage water and frozen tube annular guide water channel conduction mechanism, adopted the comprehensive grouting technique that subsection downlink, section within uplink’ intramural, wall after and frozen tube annular guide water channel grouting, point-to-point grouting, continuous grouting, at the same time installed the orifice prevent-spray device solved the shaft sidewall leakage water problem, creatively used the anchor sluice wall, cofferdam’ way buried aqueduct, reverse-current’ water diversion grouting of vertical shaft frozen tube annular guide water channel Thoroughly solved the inrushing water disaster problem, the whole shaft’ ponding rate was 95.3%, can provide guidance for other similar grouting engineering.

The pile splicing types and joints development of prestressed concrete pipe pile is introduced. According to the two kinds of end plate welding and mechanical bond express joint, their different characteristics, mechanical properties and application conditions are analyzed. Based on this, the affect which act on load capacity and quantity caused by pile splicing are discussed. And the pile splicing controlling point have been clarified, so as to provide basis for improving pile splicing quality and reducing engineering accident.

Zhengzhou coal seam coal mining company accomplished very soft, in working face advances process, coal wall piece help extremely serious, roof extremely easily take falls, fluctuation two lane pressure big, mining coal floor rolling, dozen of ballastless phenomenon common, mining equipment, and often causing severe worn face transporters killed, labor intensity is greatly increased, for safety production adverse factors. Through adopt a series of measures, make the dedication of ore sliding structures under the fully-mechanized face realize smoothly mining, has obtained the certain economic benefits.

Linnancang Mining Industry Branch Company is attached to Kailuan Group Co., Lt. The -650 blind shaft is an key component of horizontal extend project. Its bottom entrance roadway of car feeder foundation is deformed with serious floor heave and sides convergence after being drived 120 days. The roadway can not be used safely and regularly for transporting after 7 months. This article analyzes thoroughly the mechnism of the floor heave and bring forward a comprehensive solution, which is of anchoring and shotcreting, inverted arch, reinforced concrete, grouting, etc. Therefore, The supporting parameters is optimized. Observations in the engineering show that the floor heave control comprehensive support is successful and provide referential experience for similar roadway project.

Directed at the situation of 1307 big tilting cape fully mechanized caving face of Yangcheng Mine, by checking the strength of the winch in the system of extract and transport, determine the fix way of basic support and transition support, which the basic support assembled in the crossheading and the transition support in the cutting hole, then the basic support be transferred to the cutting hole. Related installation process be used, correlated technical safety measures be established, the support installation of dip angle fully mechanized caving face achieved safety and quickly.

When the ventilation system of the fallway belt mine-loading station of the vertical shaft in the 2nd shaft of Zhaozhuang is during the alteration of meteorological condition or when it is regulating the entering airflow of the main or auxiliary shaft, the ventilating current between the shaft bottom and the fallway is always reverse and unstable, the wind speed in the material roadway is transfinite. According to the theory of mine ventilation network, the reason that causes this phenomenon is the main vertical shaft is located on the diagonal branch of the complex diagonal ventilation network, and the wind resistance in the station detour is bigger, but the wind resistance in the examine and repair tunnel is smaller. So the corresponding measures are put forward: enlarging the wind resistance in the examine and repair tunnel and excavating a new intake entry. Through treatment, the problem which concerns that the bottom airflow is reverse and the wind speed in the material roadway is transfinite is solved, thereby reducing the resistance of mine ventilation.

Carboniferous limestone water has threatened the mine production in Yongxia mining area, especially water inrush from limestone floor caused by coal floor fissure seriously affected the mine safety production and economic benefits. Base on the condition of water inrush caused by fissure which has cut the coal floor aquiclude, water inrush from coal floor fissure has been classified into two types: through leading fissure and through growing fissure。 Numerical simulation has been carried on to study the mechanism of the two types water inrush by Flac3D. The research can provide the certain basis for the prevention of water inrush from coal floor fissure.

Aim at the late recycle of shaft protective coal pillar, this article considers the mine influence before the shaft construction, and takes some corresponding protect technology. The research announces that the deformation mechanism process of the shaft in the vertical direction from elastic stage to plastic stage. According to the mine deformation mechanism of the shaft, this article uses the technical measures which couple hardness with softness to realize the safety protection of shaft. The article emphasizes the flexible technical measures of adding the rubber brick flexible shaft wall in the stratum weak location. Practice shows that, this research result can achieve the good technical effect, and will be widely used.

Based on the geological and mining conditions of the 3# coal seam in testing mining section of a certain coal mine, and by theory study and numerical simulation, we research on the figure and the max height of overburden failure, and this can provide a reliable guarantee for coal mining under water body with caving method.

The framed roadway support intensity of 31 roadway in Jiaoxue No.2 Coal Mine of Zhengzhou Coal Industry (Group) can not be enough for supporting the 31 roadway due to the increment of in situ stress. Strata behaviors of 31 roadway was very obvious, and there was large deflection deformation on the flange beam and closing tendency between two legs. Aiming at this problem, cable-grouting supplement support was used to reinforce the 31roadway. The support parameters of cable-grouting supplement support were obtained based on theoretical calculation, including diameter, interval, cable length and so on. The feasibility and effectiveness of the support parameters were verified through FLAC3D program.

For the characteristics of soft-rock deformation and failure and self-stabilization phenomenon, the "limited self-stabilized hidden arch" concept is put forward, and gives the equation of elliptic arch curve from, clarify the importance of roadway roof stability control in surrounding rock and reveals the control object is hazard rock in self-stabilized hidden arch, clearly support the purpose is to reduce hight of arch, and control the stability of hazard rock. At last, through support practice in Peigou -300 level tunnel, proved successful by engineering application.

Based on the actual situation in Inner Mongolia TangGong ditch coal, using the large plastic deformation caursed ductile damage constitutive model and the classical Drucker-Prager constitutive model, a numerical simulation model was established using the dynamic FEM analysis software ABAQUS/EXPLICIT to simulate the dynamic response of the roadway under an impact load at different horizontal and vertical distances from the roadway. The results show that: the horizontal distance L of the impact load from the roadway increases, the area for the plastic energy to release increases, the influence of impact load to the roadway decreases and also the damage position of the roadway changes from the upper side to the lower side as the energy release position changes from the upper side to the lower side of the lane ; the vertical distance H increases, the concentrate degree of energy release decreases, thus the roadway is more stable. The results are basically the same as the construction site.

Based on geological and mining technical conditions of protective layer mining in Huai Nan mining area Gu Qiao Mine，in the same time，by using method of combining computer numerical simulation (FLAC5.02D) systems and on-site engineering practice，the similarities and differences of the strata-pressure behavior between pressurized area and distressed zone in the protected layer after mining the protective layer are studied．The results show：After efficiently mining，the protected layer’s vertical and horizontal stress concentration factor in distressed zone decreased to 0.31 and 0.34，however the utmost stress concentration factor in the pressurized area is 1.68 and 1.55；The destructiveness of the protected roof in the distressed zone is more serious than that in the pressurized area．The practice results show that the distance of periodic weighting in the pressurized area is 1.6 times as the one in the distressed zone，and the deformation of surrounding rock is smaller than the one in the distressed zone．

Analysis the fault of pretreatment in Flac3D,and the superiority of visual modeling in Ansys;Use the strong function of pretreatment in Ansys to complete the calculation model,and make the data of Ansys into the data of Flac3D by the third-party interface program,provide accurate calculation model for numerical simulation with Flac3d；This paper mainly introduces modelling and meshing rapidly in Ansys，and combines the engineering practice，modelling and meshing calculation model rapidly,and state the interface added in Flac3D detailedly,provide the important reference value for numerical calculation of Flac3D.

Based on Fluid Dynamics and Combustion Theory, the model of pipeline was created by the software of CFD, and the spread of gas explosion was simulated in the conditions of pipelines of different length. The flame speed was obtained, as well as the the law of pressure changing with time in the pipeline. The results showed that the acceleration of flame speed could be divided into three phases: diffuse transmit, rise rapidly, inertial motion; mutation pressure affected the turbulence of flame and was the significant reason to the rise of flame speed; when the pipeline got longer, the maximal flame speed would be higher, in addition, the transition distance that flame speed rise to a high speed would tend to stable.

Base on summarizing the application situation of dry coal beneficiation with fluidized bed and present situation of the mediums, this paper mainly studied the fluidization and beneficiation of the Air-dense medium fluidized bed by using paigeite powder and magnetite powder as multivariate-medium-solids. This paper chose -0.3+0.15mm、-0.15+0.125mm and -0.125+0.074mm paigeite powder to be respectively mixed in certain ratio with -0.074+0.045mm magnetite powder ,and analyzed their fluidization characteristics. Research contents of this dissertation mainly involve fluidization properties of setting up the regression model of incipient fluidization velocities and average granularity，and the model of fluidized bed density.

Abstract: In view of the problem confronted that ash content of flotation concentrate being hardly reach the aim, the advantages of the FCMC series of cyclonic micro-bubble flotation column and the current situation of industry application were analyzed. The influence of flotation feed characterizes and condition on flotation effect was explained. And a new method of applying cyclonic micro-bubble flotation column to separation fine coal instead of flotation cell was brought. Finally, the advantages of cyclonic micro-bubble flotation column were proved by experiments.

As China's primary energy, it’s important to mine to produce safely and evaluate the emergency capability. This paper analyzes the content of the mine emergency management, following the index construction principles, establishes the evaluation index system of emergency capability in mine, and evaluates the emergency capacity of mine based on gray system theory. It helps enterprises to find out the shortcomings of the existing system and improve the system.

The experiments select Wang Taipu gangue as raw materials and adopt single factor and orthogonal experimental method to study the leaching of aluminum oxide from gangue using sulfuric acid as leaching medium. Through the parallel experiment of the leaching time, the ratio of solvent to sample mass, the concentration of sulfuric acid and the ratio of liquid to solid , we found that the affecting regulation of every factors on the leaching rate of aluminum. In order to determine the optimum leaching conditions, we use L9 (34) orthogonal experiment. Through the orthogonal experiment, we got the optimum conditions, leaching time was 120min, ratio of solvent to sample mass was 0.20, sulfuric acid concentration was 3mol/L, ratio of liquid to solid was 15:1, and aluminum oxide extraction rate was 79.60%.

The paper analyzed geohydrologic features and water abundance of benxi formation limestone in Longdong mine field based on fully collected materials of geology and hydrogeology during every exploration stage and production process. The results showed that water abundance of benxi formation limestone was poor, but had some relations with ordovician limestone aquifer. The research outcomes had direction effect in safety mining of 21st mine and plans of water control measures.

With the improvement in the level of mechanization, high efficiency, high-power digging machine is more and more used in rock roadway, accompanied by the rapid increase driving speed also makes the heading face of the sharp increase in the amount of dust generated. Through the introduction of wet-dusting removal technology (WRT), this paper has designed the dust scrubber with fan, calculated the reasonable distance from ventilation duct to working face, and arranged rationally the mechanized face ventilation and dust removal system. All these measure will effectively achieve the purpose of controlling fully the mechanized face dust.

A three-dimensional model of auger miner’s working body is established based on UG. The model is imported to ADAMS and then the virtual prototype is built and analyzed in ADAMS. At the same time, I also talk about the stress analysis of the drill pipe. The results show that no interference occurs among the various components of the working body and all mechanisms move smoothly and steadily. What’s more, the simulation results are agreed with actuality, which can lay a good foundation for the design of auger miner’s working body and provide a reference for the drilling tools’ deflection problems.

In this paper, we first make the three-dimensional modeling for continuous fully hydraulic track loader Frame with CATIA software, at the same time, giving the finite element analysis and modal analysis for the frame. We can find the load stress distribution, the low natural frequency and its vibration modes of the frame. It can provide fundamental analysis for the design and improvement of track frame.

In allusion to the existing problems of the original control system,in tangshan coal preparation plant.This paper analysised the feasibility of the technical renovation scheme. And introduces the reconstruction scheme and effect of the new control system,which is construct of fiber redundant ring ,based on OMRON CS1 series PLC, in tangshan coal preparation plant.

Abstract：For coal mining enterprise, business activity in the construction especially needs outstanding safety culture, conduct building safety in coal mining enterprises to conduct the development of culture, and especially to the coal production system in the centre of “human” factors. in coal mining enterprises for the conduct of the accident happened and development of the vital role. In coal mine production and operation and the process of development, how to make the “human behavior”to avoid “unsafe” to realize “safe”, strengthening the safety behavior culture construction is of great significance.