基于固支梁理论的煤层底板突水破坏机制分析  

Analysis of Water Inrush Failure Mechanism of Coal Floor Based on the Theory of Fixed Beam

作　　者：沈义东 沈军辉[1] 李何伟 SHEN Yidong;SHEN Junhui;LI Hewei(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验,四川成都610059

出　　处：《湖南科技大学学报（自然科学版）》2021年第1期17-22,共6页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(41572308)。

摘　　要：我国煤层底板隔水层的厚度不一,部分煤层开采底板隔水层厚度巨大,不符合弹性薄板理论的适用条件.故文章采用弹性力学固支梁理论建立任意一点应力计算模型,推导承压水作用下底板隔水层的应力解,根据皖北煤电集团某矿采煤工作面底板隔水层力学特性,并结合FLAC3D软件分析底板隔水层应力分布和底板突水破坏机制.研究表明:底板隔水层的极限水压力与隔水层厚度成正比;当隔水层厚度h与开采工作面跨度b满足h/b≤0.7,隔水层发生弯拉破坏;当h/b≥0.7时,隔水层发压剪破坏.此研究成果为分析底板突水破坏提供理论参考.The thickness of the water-proof layer of the coal seam floor in China is different,and the thickness of the water-proof layer of the coal seam floor in some coal seams is huge,which does not meet the applicable conditions of the elastic thin plate theory. The theory of elastic mechanics fixed beam was adopted to establish an arbitrary point stress calculation model,and the stress solution of the floor aquifer under the action of confined water was derived. According to the mechanical characteristics of the floor aquiclude in a coal mining face of Wanbei Coal and power group,and combined with FLAC3D software,the stress distribution of the aquifer of the floor and the mechanism of floor water inrush was analyzed. The research shows that: the ultimate water pressure of the bottom impervious layer is proportional to the thickness of the impervious layer;when the thickness h of the impervious layer and the span b of the mining working face satisfy h/b ≤ 0. 7,the tensile damage of the impervious layer occurs;when h/b When it is ≥0.7,the water barrier is damaged by pressure shearing. The research results provide a theoretical reference for the analysis of water inrush failure of the floor.

关 键 词：底板突水 固支梁理论 应力分析 FLAC3D 破坏特征 

分 类 号：TD821[矿业工程—煤矿开采]