单轴压缩下煤岩损伤研究

Study on Damage of Coal under Uniaxial Compression

根据前人对煤岩的实验研究,采用岩石强度随机统计分布假设,建立了能够较好的反映煤岩单轴压缩状态下的初始压密段和残余强度的分段损伤本构方程,并且给出了其中参数的确定办法。利用刚性实验机进行了煤岩单轴压缩实验,对应力-应变曲线与损伤的关系进行了分析。利用实用复合形法对所提的损伤本构方程进行了参数求取。拟合结果表明理论和实验结果符合较好。

Based on predecessors＇studies on damage of coal and the random statistical distribution hypothesis of rock strength, a statistical 2 - segment constitutive model for rock damage under uniaxial compression, which can reflect the strength in initial compressive and the residual strength of rock, was established by use of continuous strength theory and statistical theory, and the method to determine the parameters of the statistical damage constitutive model of rock was given. The uniaxial compressive tests of coal were carried out using rigid testing system, and the relation between damage and stress - strain curves of the coal samples under uniaxial compression were analyzed. The parameters of established damage constitutive model were solved by using practical complex method. The fitting results showed that theoretical result is in good agreement with the data from experiments.