煤岩体全应力应变渗透性试验及主控因素分析  

Main Controlling Factors and Experimental Study on Permeability of Coal-rock mass During Full Stress-strain Process

作　　者：段昌瑞[1,2] 薛俊华[1,2] 周伟[1,2] 

机构地区：[1]淮南矿业集团,安徽淮南232001 [2]深部煤炭开采与环境保护国家重点实验室,安徽淮南232033

出　　处：《煤矿安全》2016年第4期181-185,共5页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51427804);"十二五"国家科技支撑计划资助项目(2012BAF14B00);安徽科技攻专计划资助项目(1510115227)

摘　　要：对影响渗透性的若干关键因素开展试验研究。系统分析了不同围压下、不同瓦斯压力和不同应力-应变状态下煤岩样的渗透特性,建立了煤样的渗透性与围压、瓦斯压力和应力应变等主要控制因素之间的定量关系,探讨了不同载荷条件下煤样的控制机制和变形规律。研究结果表明:固定瓦斯压力下,煤样渗透性随围压的增大而减小,服从指数函数变化规律;固定围压作用下,受Klinkenberg效应影响,渗透率与瓦斯压力关系呈"V"字型走势;在微型裂隙闭合和弹性变形阶段,煤样渗透率随应力增大而减小,进入屈服阶段后,渗透率达到最小值并在峰值强度到达之前完成反超过程。The experimental study on several key factors of coal specimen permeability is conducted herein. Permeability properties of coal specimens are analyzed systematically for different gas pressure,and different stress- strain conditions. Quantitative and qualitative relation between coal sample permeability and confining pressure,gas pressure and stress- strain curve is established respectively.The controlling mechanism and changing laws of permeability of coal samples under variable loading conditions are discussed. The results show that： for fixed gas pressure condition,coal permeability decreases with increasing of confining pressure; and the decreasing law obeys an exponential law; for fixed confining pressure condition,the relation between permeability and gas pressure is show a approximate ＂ V＂ cure in shape affected by Klinkenberg effect; at the stage of micro fissure closing and elastic deformation,the permeability of coal specimen decreases with the increasing of stress; after entering into the yield stage,the permeability of coal specimen reaches the minimum and the anti- exceeding is accomplished before it reaching the peak strength.

关 键 词：低透气性 应力-应变 主控因素 有效应力 煤岩渗透性 

分 类 号：TD822[矿业工程—煤矿开采]