层状岩体强度结构面特征的数值分析

运用FLAC3D软件建立层状岩体试件模型,分析单轴压缩情况下的破坏模式和强度各向异性特征.研究结果表明:随着结构面倾角β的增大,试件抗压强度σc呈现先减小后增大的趋势；当结构面倾角为20°～30°和80°～90°时,试件抗压强度对β的灵敏度最大；当β为30°～70°时,σc变化不大；当结构面内摩擦角φj＜β＜90°时,数值计算结果和理论计算结果差别较小；当β≤φj或β=90°时,两者差别较大,数值计算结果明显小于理论计算结果；数值模拟结果能够反映出β≤φj和β=90°对应的岩体抗压强度存在一定差别,与实际情况相符.

Numerical analysis of structure plane characteristic for strength of stratified rock mass

A stratified rock mass model was founded using FLAC3D software.The failure mode and anisotropic characteristic of strength for stratified rock mass were analyzed.The results show that,with the increase of inclination of structure plane β,the compressive strength σc of rock sample firstly decreases and then increases;when β is 20°?30° and 80°?90°,σc has the largest sensitivity to β;while β is 30°?70°,σc varies little;when φj<β<90°,the results obtained from numerical simulation and theoretical analysis are almost the same;while β≤ j or β=90°,they are greatly different,the results obtained by theoretical analysis are obvious larger than those by numerical simulation;the results from numerical simulation can reflect the difference of compressive strength of rock samples for the two situations of β≤ j and β=90°,which is in accordance with the real situation.