采矿与安全工程学报2017，Vol.34Issue(6)：1216-1222,7.DOI:10.13545/j.cnki.jmse.2017.06.027
基于加卸载速度影响下的含瓦斯煤力学及渗透特性实验研究
Experimental study of mechanical and permeability characteristics of coal with methane containing due to different loading-unloading speeds
摘要
Abstract
Using the self-made triaxial servo-controlled seepage experimental equipment for ther-mo-hydro-mechanical coupling of coal with methane containing, the experimental studies of mechanical and permeability characteristics of such coal samples taken from Baijiao mine are performed under dif-ferent loading-unloading speeds. The results show that: the strength of coal under different load-ing-unloading speeds increases logarithmically with increasing initial hydrostatic stress and decreases with increasing loading-unloading speeds presenting the power function relationship; The major failure form of loading-unloading coal is the shear failure. Some coal samplers show the tenso-shear failure mode. Not all of loading-unloading coal samples show decreasing firstly and then increasing later as"V" shape of the permeability change rule. Under the tenso-shear composite failure, there is a change rule of the permeability that increases after decreasing followed by a declined stage around the peak point and shows as a "W" shape. Compared with coal samples without methane containing, the strength is lower. The axial strain is smaller when it fails. The rate of deformation modulus is bigger at the moment of failure and the phenomenon of dilatancy is more obvious.关键词
含瓦斯煤/加卸载/强度/渗透率/破坏形式Key words
coal with methane containing/loading-unloading/strength/permeability characteristics/failure form分类
矿业与冶金引用本文复制引用
蒋长宝,俞欢,段敏克,李广治..基于加卸载速度影响下的含瓦斯煤力学及渗透特性实验研究[J].采矿与安全工程学报,2017,34(6):1216-1222,7.基金项目
国家自然科学基金项目(51674048,51204217) （51674048,51204217）
重庆市科技计划项目(cstc2015jcyjA90009) （cstc2015jcyjA90009）
