地应力与瓦斯压力环境下原煤变形及渗流规律研究  

Study on the Deformation and Infiltration Law of Raw Coal Under In-Situ Stress and Gas Pressure

作　　者：杨玉顺 张东明[2] 张继华[1] 武精科 Yang Yushun;Zhang Dongming;Zhang Jihua;Wu Jingke(Faculty of Architecture and Civil Engineering,Huaiyin Institute of Technology,Huaian,Jiangsu 223001,P.R.China;State Key Laboratory of Coal Mine Disaster Dynamic and Control,Chongqing University,Chongqing 400030,P.R.China;Institute of Intelligent Manufacturing and Smart Transportation,Suzhou City University,Suzhou,Jiangsu 215104,P.R China)

机构地区：[1]淮阴工学院建筑工程学院,江苏淮安223001 [2]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030 [3]苏州城市学院智能建造与智慧交通学院,江苏苏州215104

出　　处：《地下空间与工程学报》2024年第6期1854-1866,共13页Chinese Journal of Underground Space and Engineering

基　　金：淮安市自然科学研究项目(HAB202154);国家自然科学基金(51904112);贵州省教育厅青年科技人才成长项目(黔教技[2022]287号)。

摘　　要：地应力与瓦斯压力耦合环境是引起煤与瓦斯突出等灾害的重要因素之一,结合杉木树煤矿2+3#煤层所处地应力及瓦斯压力地质条件,开展地应力与瓦斯压力耦合环境下原煤的变形及渗流特性室内试验。结果表明:在瓦斯压力-地应力环境下,增轴压过程中煤样轴向应变、径向应变与偏应力均呈线性关系,煤样泊松比随偏应力的增大满足二次函数增大,煤样渗透率与偏应力均满足ExpDec1函数;增围压过程中煤样轴向应变、径向应变与偏应力均满足线性关系,煤样泊松比随偏应力的降低呈ExpDec1函数增大,煤样渗透率与偏应力均满足ExpDec1函数;同时,增轴压和卸围压过程中煤样轴向应变与偏应力满足线性关系,径向应变与偏应力均满足二次函数关系,煤样泊松比随偏应力的增大呈ExpDec1函数降低,煤样弹性模量随偏应力的增大呈ExpDec1函数增大;随后的加卸载过程直至破坏后出现残余强度前煤样渗透率几乎为零,煤样出现残余强度后渗透率迅速增大。The coupling environment of in-situ stress and gas pressure is among the important factors that can cause coal and gas outbursts and other disasters.Here,an investigation into the deformation and seepage characteristics of raw coal under the coupling environment of in-situ stress and gas pressure was conducted in a laboratory setting,considering the geological conditions of the in-situ stress and gas pressure of the 2+3#coal seam in the Shanmushu Coal Mine.The results show that:Forcing related to gas pressure,in-situ stress,axial strain,radial strain,and deviatoric stress exhibit a linear response in the process of loading axial stress.Poissons ratio satisfies a quadratic function with increased deviatoric stress,and the permeability and deviatoric stress satisfy an ExpDec1 function.The linear relationship between axial strain,radial strain,and deviatoric stress is satisfied in the process of loading confining pressure,and the Poissons ratio of coal samples increases with the decreased deviatoric stress,as given by an ExpDec1 function.Before reaching the peak strength,the axial strain and deviatoric stress have a linear relationship while simultaneously loading axial stress and unloading confining pressure,and the radial strain and deviatoric stress are related by a quadratic function relationship.The Poissons ratio decreases with increasing deviatoric stress,and the elastic modulus increases with the deviatoric stress consistent with an ExpDec1 function.In the subsequent loading and unloading process,the permeability is almost zero before the residual strength appears after failure,and rapidly increases after the residual strength appears.

关 键 词：地应力 瓦斯压力 耦合 原煤 变形参数 渗流规律 

分 类 号：TD712[矿业工程—矿井通风与安全]