大倾角煤层开采顶板主应力方向分布特征及力学分析

doi:10.11799/ce202405017

Abstract

Abstract:

In order to analyze the influence of the rotation of the maximum principal stress direction of the roof on the deformation and damage of the roof, taking the 25221 working face of 2130 mine of Xinjiang Coking Coal Group as the background, the roof failure and the evolution characteristics of the rock structure are analyzed by the physical similarity simulation experiment and FLAC3D numerical simulation method, the maximum principal stress direction deflection and its impact on the roof damage. On this basis, the roof mechanical model is established to discuss the distribution characteristics of the roof deflection. With the advancement of coal mining, the range of bearing arch above the roof failure envelope increases, and the arch extends to the middle and upper part of the rock stratum; The contour distribution pattern of the maximum principal stress direction of the roof gradually evolves from "m" to "n" type (The maximum principal stress direction of the roof in the middle and upper part of the goaf deflects greatly). Under the synergetic effect of the principal stress direction deflection and the optimal expansion crack angle, the middle and upper parts of the roof are damaged and migrate to the high level rock stratum, gradually; Establish the roof mechanical model, and substitute the roof data into the calculation through Python programming, so that the deflection peak value, along the tendency, will appear at 4/5 of the roof.

CLC Number:

TD323

References

[1]伍永平，刘孔智，贠东风，等．.大倾角煤层安全高效开采技术研究进展[J].煤炭学报, 2014, 39((8)):1611-1618 [2]黄建功.大倾角煤层采场顶板运动结构分析[J].中国矿业大学学报, 2002, 31(5):441-414 [3]王红伟．.大倾角煤层长壁开采围岩应力演化及结构稳定性研究[J].西安西安科技大学, 2014, :- [4]Wang Hongwei, Wu Yongping, Liu Maofu, et al.Roof-breaking mechanism and stress-evolution characteristics in partial backfill mining of steeply inclined seams[J]. Geomatics, Natural Hazards and Risk, 2020, 11((1)):- [5]Xing-ping Lai, Huan Sun, Peng-fei Shan, et al.Structure instability fore-casting and analysis of giant rock pillars in steeply dipping thick coal seams[J].International Journal of Minerals, Metallurgy, and Materials, 2015, 22((12)):- [6]来兴平，杨毅然，单鹏飞，等.急斜煤层顶板应力叠加效应致灾特征综合分析[J].煤炭学报, 2018, 43(1):70-78 [7]来兴平，程文东，刘占魁.大倾角综采放顶煤开采数值计算及相似模拟分析[J].煤炭学报, 2003, 28(2):117-120 [8]罗生虎，伍永平，刘孔智，等.大倾角煤层长壁开采空间应力拱壳形态研究[J].煤炭学报, 2016, 41(12):2993-2998 [9]罗生虎，王同，伍永平，等.大倾角煤层长壁开采围岩应力传递路径时空演化特征[J].煤炭学报, 2022, 47(07):2534-2545 [10]赵雁海，俞缙，周晨华，等.考虑主应力轴偏转影响的远场拱壳围岩压力拱效应表征[J].岩土工程学报, 2021, 43(10):1842-1850 [11]何富连，许磊，吴焕凯，等.大断面切眼顶板偏应力运移及围岩稳定[J].岩土工程学报, 2014, 36(6):1121-1127 [12]赵元放，张向阳，涂敏.大倾角煤层开采顶板垮落特征及矿压显现规律[J].采矿与安全工程学报, 2007, 24(2):231-234 [13]屠洪盛，屠世浩，陈芳，等.基于薄板理论的急倾斜工作面顶板初次变形破断特征研究[J].采矿与安全工程学报, 2014, 31(1):49-59 [14]汪北方，梁冰，张晶，等.浅埋煤层采空区岩体应力空间分布特征研究[J].采矿与安全工程学报, 2019, 36(6):1203-1212 [15]张艳丽，伍永平，罗生虎，等.覆岩宏观支撑结构演化过程与特征[J].中国矿业大学学报, 2020, 49(2):280-288 [16]杜晓丽．.采矿岩石压力拱演化规律及其应用的研究[J].北京中国矿业大学, 2011, :- [17]Qing Ye，Wei-jun Wang，Geoff Wang，et al．.Numerical simulation on tendency mining fracture evolution characteristics of overlying strata and coal seams above working face with large inclination angle and mining depth [J]. Arabian Journal of Geosciences, 2017, 10((4)):- [18]王家臣，王兆会，杨杰，等．.千米么深井超长工作面采动应力旋转特征及应用 [J].煤炭学报, 2020, 45((3)):876-888 [19]Hao Xianjie， Zhang Qian， Sun Zhuowen， et al．. Effects of the major principal stress direction respect to the long axis of a tunnel on the tunnel stability: Physical model tests and numerical simulation[J].Tunnelling and Underground Space Technology incorporating Trenchless Technology Research，, 2021, 114:- [20]Gong Bin， Liang Zhengzhao， Liu Xiangxin．. Nonlinear deformation and failure characteristics of horseshoe-shaped tunnel under varying principal stress direction [J].Arabian Journal of Geosciences, 2022, 15((6)):- [21]JAEGER J C, COOK NGW, ZIMMERMAN RW．. Fundamentals of rock mechanics [J].Malden: Blackwell Publishing，2007 [22]庞义辉，王国法，李冰冰.深部采场覆岩应力路径效应与失稳过程分析[J].岩石力学与工程学报, 2020, 39(4):682-694 [23]马建全，吴钶桥，彭昊，等.煤岩采动应力-裂隙带发育规律研究—以榆树湾煤矿为例[J].西安科技大学学报, 2022, 42(01):107-115 [24]池小楼.大倾角软煤层分层综采再生顶板力学特性与围岩稳定控制[D]．安徽理工大学，2021． [25].弹性力学[M]．高等教育出版社，徐芝纶， 2006．

Distribution characteristics and mechanical analysis of main stress direction of roof in steeply dipping coal seam#br#

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