充填开采底板隔水层损伤破坏特征及稳定性控制  

Damage Characteristics and Stability Control of Floor Water Insulation Layer in Filling Mining

作　　者：杨峰 李明鑫 殷聪 江昱卓 张加齐 YANG Feng;LI Mingxin;YIN Cong;JIANG Yuzhuo;ZHANG Jiaqi(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Inner Mongolia Fucheng Mining Co.,Ltd.,Ordos 016299,China;Yankuang Energy Group Co.,Ltd.,Jining 273501,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]内蒙古福城矿业有限公司,内蒙古鄂尔多斯016299 [3]兖矿能源集团股份有限公司,山东济宁273501

出　　处：《煤炭技术》2023年第11期23-29,共7页Coal Technology

基　　金：国家自然科学基金青年科学基金项目(52104152)。

摘　　要：针对深部矿井煤炭开采底板奥陶系灰岩承压水突水问题,采用FLAC3D-PFC3D耦合数值模拟方法,分别研究了垮落法开采及不同充填率开采时底板应力、底鼓变形及塑性区发育程度,进而分析了不同充填率时底板隔水层稳定性控制效果及底板隔水层破坏变形规律,从矸石充填体位移-孔隙率及应力-力链的角度分析了充填体-围岩相互作用关系。结果表明:随着充填率增大,充填体整体受力随之增大,对围岩支护效果及应力转移吸收能力增强,充填率达到80%时,底板隔水层相比于垮落法开采垂直应力最大值增加25.35 MPa,最大垂直位移降低0.08 m,塑性区发育宽度仅为垮落法开采时的1/7,底板位移变化及应力集中区较小,塑性区发育深度相比不充填时降低27 m,有效隔水层厚度达到12 m,固体充填开采能够有效地控制底板突水危险。Aiming at the problem of confined water inrush in Ordovician limestone floor during coal mining in deep mine,FLAC3D-PFC3D coupled numerical simulation method was used to study the floor stress,floor heave deformation and the development degree of plastic zone during caving mining and mining with different filling rates.Then,the stability control effect of floor waterproof layer and the failure and deformation law of floor water insulation layer under different filling rates are analyzed.The interaction relationship between backfill body and surrounding rock is analyzed from the perspectives of gangue backfill body displacement,porosity and stress-force chain.The results showed that:Increases as the filling rate,filling the whole stress increase,the supporting effect of surrounding rock and stress transfer absorption ability enhancement,filling rate of 80%,the floor water-resisting layer compared with caving mining method of maximum vertical stress increased 25.35 MPa,the maximum vertical displacement by 0.08 m,width of plastic zone development is only 1/7 of the caving mining method,the floor displacement change and stress concentration area are small,the development depth of plastic zone is 27 m lower than that without backfilling,and the effective waterproof layer thickness reaches 12 m.Solid backfilling mining can effectively control the water inrush risk of floor.

关 键 词：固体充填 充填体压缩特性 FLAC3D-PFC3D耦合 底板隔水层 

分 类 号：TD823[矿业工程—煤矿开采] TD745[矿业工程—矿山开采]