断层影响下煤层开采突水风险流固耦合数值模拟研究  

Study on Fluid-solid Coupling Numerical Simulation of Water Inrush Risk in Coal Seam Mining underr Influence of Fault

作　　者：王红梅 宁明诚 鲁海峰[2] 周恒心 WANG Hongmei;NING Mingcheng;LU Haifeng;ZHOU Hengxin(CCTEG Xi'an Research Institute(Group)Co.,Ltd.,Xi'an 710000,China;School of Earth and Environment,Anhui University of Science and Technology,Huainan 232000,China;Jining No.2 Coal Mine,Yankuang Energy Group Co.,Ltd.,Jining 272000,China)

机构地区：[1]中煤科工西安研究院(集团)有限公司,西安710000 [2]安徽理工大学地球与环境学院,安徽淮南232000 [3]兖矿能源集团股份有限公司济宁二号煤矿,山东济宁272000

出　　处：《煤炭技术》2024年第1期180-184,共5页Coal Technology

摘　　要：断层引起的底板采动突水是煤矿防治水中的重要问题,研究因采动引起断层活化,以及对底板渗透性变化全程进行演化是解决此类问题的关键。在前人成果的基础上总结了采动过程中围岩渗透性变化规律及渗透系数-体积应变耦合方程,将其嵌入FLAC3D流固耦合模型中。并以济宁二矿103下03工作面八里铺断层为背景,模拟不同煤柱尺寸情况下底板断层突水演化规律。结果表明:八里铺断层对于103下03工作面安全开采具有重要影响。防水煤柱尺寸为90 m时,奥灰水会沿导水通道进入采空区,引发突水事故;当其为100 m时,采动过程是安全的,且有效隔水层厚度约5 m。最终确定济宁二矿103下03工作面八里铺断层防水煤柱留设宽度取100 m。Floor mining water inrush caused by fault is an important problem in coal mine water prevention and control.The key to solve this problem is to study the fault activation caused by mining and the evolution of the whole process of floor permeability change.Based on the existing results,on the basis of the previous results,the permeability variation rule of surrounding rock and the coupling equation of permeability coefficient-volume strain during mining were summarized,and the equation was embedded into the FLAC3D fluid-solid coupling model.Taking the Balipu fault in 1031ower 03 working face of Jining No.2 coal mine as an example,the evolution law of water inrush from fault in working face floor under different coal pillar sizes is simulated.The results show that the Balipu fault has an important influence on the safe mining of 1031ower 03 working face.When the size of waterproof coal pillar is 90 m,ordovician limestone water will enter the goaf along the water channel,resulting in floor water inrush accident.When it is 100 m,the whole mining process will not cause water inrush,and the thickness of effective aquiclude is about 5 m.Considering the safety and economy,the width of waterproof coal pillar of Balipu fault in 103iower 03 working face of Jining No.2 coal mine is 100 m.

关 键 词：渗透系数 渗透系数-体积应变耦合方程 八里铺断层 防水煤柱 

分 类 号：TD745[矿业工程—矿井通风与安全]