基于采动覆岩关键层“板-梁”结构的应力场预测模型研究  

Mining-induced stress field prediction model based on the“slab-beam”structure of overburden key strata

作　　者：韩红凯 史灿 许家林[3] 刘彦伟[1,2] 王晓振 左伟芹[1,2] AGUS Pulung Sasmito[4] 石钊旗 HAN Hongkai;SHI Can;XU Jialin;LIU Yanwei;WANG Xiaozhen;ZUO Weiqin;AGUS Pulung Sasmito;SHI Zhaoqi(College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454003,China;Henan International Joint Laboratory of Coal Mine Safety and Occupational Hazards Prevention and Control,JiaoZuo,Henan454003,China;School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Department of Mining and Materials Engineering,McGill University,Montreal,Quebec H3A0E8,Canada)

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454003 [2]河南省煤矿安全与职业危害防治国际联合实验室,河南焦作454003 [3]中国矿业大学矿业工程学院,江苏徐州221116 [4]麦吉尔大学采矿与材料工程系,魁北克蒙特利尔H3A0E8

出　　处：《采矿与安全工程学报》2024年第6期1190-1201,共12页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(52104190,52174173);中国博士后科学基金项目(2022T150194,2020M682291);河南省重点研发与推广专项项目(科技攻关)(222102320012)。

摘　　要：科学准确地预测采动应力场的空间分布对矿井动力灾害的预警与防治意义重大,但现有预测方法对覆岩关键层的赋存和破断运动特征研究不足,并不适用于覆岩存在典型厚硬关键层和多层关键层的开采条件。将弯曲下沉带和实体煤侧裂隙带关键层分别简化为多层叠合无限长和半无限长弹性地基板,采空区侧裂隙带破断关键层简化为多层叠合“砌体梁”,建立了基于采动覆岩关键层“板-梁”结构的应力场预测模型,提出了不同层位关键层下采动应力和采场支承压力的平面分布预测方法,验证了亭南煤矿和海孜煤矿采动应力实测结果与矿压显现规律。揭示了采空区尺寸和关键层厚度对应力场的影响规律,阐明了注浆充填控制厚硬关键层下高采动应力集中的力学机制及控制效果。研究发现,海孜煤矿Ⅱ1024工作面120 m厚的火成岩关键层仅将其35.1%的载荷传递至采空区中心,导致高采动支承压力集中的情况。注浆充填技术可将该比例提高至93.9%,使应力集中系数由1.90降至1.17,影响范围由309 m降至138 m,保障了工作面的安全开采。Scientific and accurate prediction of the spatial evolutions of the mining-induced stress field is of great significance for the pre-warning and prevention of dynamic disasters.However,existing prediction methods,which fail to sufficiently consider the occurrence conditions and the fracture movement characteristics of overburden key strata,are not suitable for the mining conditions where the overburden encompasses a typical thick and hard key stratum or multiple key strata.By simplifying key strata in the bending subsidence zone into multi-layer laminated infinite elastic foundation slabs,those in the fracture zone on the coal mass side into semi-infinite elastic foundation slabs,and those in fracture zone on the goaf side into multi-layer laminated masonry beams,a mining stress field prediction model based on the“slab-beam”structure of overburden key strata was established.Meanwhile,a method of predicting the two-dimensional distribution of mining-induced stress and stope abutment pressure of key strata at different horizons was proposed and verified using the measurement results of mining-induced stress and mine pressure behaviors in Tingnan Coal Mine and Haizi Coal Mine.Furthermore,how the goaf length and the key stratum thickness influence the mining stress field was revealed,and the mechanical mechanism and control effect of grouting filling on the serious concentration of mining-induced stress under thick and hard key strata were illustrated.It is found that the key stratum of 120-meter-thick igneous rock in theⅡ1024 working face of Haizi Coal Mine merely transfers 35.1%of its load to the goaf center,which results in serious concentration of stope abutment pressure.The grouting filling technology can increase this proportion to 93.9%,reduce the peak stress concentration coefficient of abutment pressure from 1.90 to 1.17,and narrow the influence range from 309 m to 138 m,hence ensuring safe mining in the working face.

关 键 词：关键层 采动应力场 支承压力 煤与瓦斯突出 注浆充填 

分 类 号：TD32[矿业工程—矿井建设]