Experiment study on the law of effective stress of coal masses during methane drainage

作     者：冯增朝 吕兆兴 赵阳升 

作者机构：Institute of Mining Technology Taiyuan University of Technology Taiyuan 030024 China 

出 版 物：《Journal of Coal Science & Engineering(China)》 (煤炭学报（英文版）)

年 卷 期：2007年第13卷第4期

页      面：444-447页

学科分类：0819[工学-矿业工程] 081903[工学-安全技术及工程] 08[工学] 

基　　金：Supported by the National Natural Science Foundation of China(50404017) the Natural Science Foundation for Young Scientists of Shanxi Province, China (20051026) 

主　　题：methane coal masses effective stress experiment study 

摘      要：The methane drainage can not only make coal seams deformation, but also effect its stress distribution. Based on lab experiment on methane drainage with a cubic coal sample of 500 mm×500 mm×500 mm, mutative law of coal of pore pressure （p） and effective stress （σef）i were investigated during methane drainage with the coal sample of China Lu＇an coal field No.3 coal seam. The experiment results indicate： during methane drainage pore pressure （p） follows exponential attenuation law： p=aexp（-bt）; effective stress （σef）i of coal masses follows logarithm incremental law： （σef）,=aln t＋b, （i=x, y, z）; effective stress coefficient（a） follows logarithm attenuation law： a=a-bln t; effective stress coefficient, volume stress （Θef） and pore pressure （p） follow bilinear law.