孔隙压和吸附引起煤体变形规律的试验研究  

Experimental Study on Deformation Law of Coal Body Caused by Pore Pressure and Adsorption

作　　者：刘鹏 赵阳升[1] 冯子军[1] LIU Peng;ZHAO Yangsheng;FENG Zijun(Institute of Mining Technology,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学采矿工艺研究所

出　　处：《煤矿安全》2019年第10期5-8,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目（11772213）

摘　　要：为研究孔隙压力和吸附作用单独引起的煤体变形效应,利用固流耦合试验装置,在恒温恒压条件下测量不同孔隙气体(Ar、CO2、CH4)及孔隙压力条件引起煤体的轴向变形及侧向变形。研究发现:孔隙压力和吸附作用单独引起的轴向和侧向变形都随孔隙压的增大而增大,轴向应变大于侧向应变;孔隙气体引起的煤体有效应力系数α由孔隙压物理力学作用和吸附化学作用共同组成,可表示为α=α1+α2;有效应力系数α1和α2均遵循关于孔隙压力p和体积应力Θ的双线性规律;有效应力系数存在各向异性,垂直于层理方向的有效应力系数大于平行于层理方向的有效应力系数。In order to investigate the swelling deformation effect of coal induced by pore pressure and gas adsorption,the solid-flow coupling experimental equipment was used to perform the axial and lateral deformation test of coal under different gases(Ar,CO2,CH4)and different pore pressures under the constant temperature and pressure conditions.The results show as follows:the coal deformation caused by pore pressure increases with the increase of pore pressure.The coal deformation caused by adsorption increases with the increase of pore pressure.And the axial strain is greater than the lateral strain.The effective stress coefficient α influenced by pore pressure and adsorption,it can be expressed as α=α1+α2.Both the effective stress coefficients α1 and α2 follow the bilinear law with respect to pore pressure p and volume stress Θ.The effective stress coefficient α is anisotropic,and the effective stress coefficient perpendicular to the bedding direction is greater than the effective stress coefficient parallel to the bedding direction.

关 键 词：孔隙压 吸附 有效应力 变形规律 固流耦合 

分 类 号：TD712[矿业工程—矿井通风与安全]