无煤柱开采条件下煤岩体支承压力的数值模拟  

Numerical simulation of abutment pressure in coal for non-pillar mining

作　　者：赵鹏[1] 谢凌志[1] 熊伦[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065

出　　处：《煤炭学报》2011年第12期2029-2034,共6页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2011CB201201)

摘　　要：基于煤层的开采引起上覆岩层大范围移动和应力重分布,尤其是工作面周围煤岩体的承载应力变化这一理论,运用ANSYS对无煤柱开采进行数值模拟,观察到在开采过程中采空区上方煤岩在3个主应力方向均出现裂缝,且裂缝沿着工作面推进方向向前扩展,由此初步得到在开采影响下采空区上方的煤岩体内裂缝分布及发育情况;依据数值模拟结果,拟合出工作面周围煤岩体应力环境曲线,即减压区、增压区和稳压区3个区;通过计算得出无煤柱开采过程中支承压力集中系数的范围为2.54～2.96。同时由小煤柱的宽度与应力集中系数的关系发现:柱宽越大,相同条件下的集中系数越小,并且增幅越小。Based on the theory that mining of coal seam causes wide range of overlying stratum’s movement and stress redistribution,especially the change of abutment pressure of coal around mining face by using ANSYS to simulate non-pillar mining,observeing that there is crack in three principal stress directions of the coal above the goaf in the process of mining and the crack develops along the working direction of the mining face,thus preliminaryly got the distribution and development situation of cracks in the coal above the goaf under the influence of mining.According to the numerical simulation results,figured out the stress environment curves of coal around the working face,namely the reduced pressure zone,pressure area and voltage stabilizing area.Through calculating,the range of abutment pressure concentration coefficient for non-pillar mining is 2.54~2.96.Meanwhile,through the relation between the width of small coal pillar and the stress concentration coefficient,it is found that under the same conditions,the greater the wide column is,the smaller the coefficient is,and the smaller the increment is.

关 键 词：无煤柱开采 支承压力 裂缝 应力集中系数 

分 类 号：TD323[矿业工程—矿井建设]