考虑三向应力的弱面岩石强度分析

发布时间：2018-06-13 03:23

  本文选题：岩石力学 + 弱面　； 参考：《岩石力学与工程学报》2017年S2期

【摘要】：弱面岩石通常具有明显的强度各向异性,一般的弱面理论都是在平面应力状态内分析岩石强度,不能准确分析所有的弱面情况。借助张量的坐标转换方法,计算空间任意方位上的弱面应力分量,建立考虑三向应力的弱面岩石剪切强度模型。分析结果表明,对于单弱面岩石,中间主应力对岩石强度的影响是非常大的。当(中间主应力)σ_2≠σ_3(最小主应力)时,弱面岩石的强度受剪切破裂面法向与最大主应力之间的夹角β和弱面倾向α同时控制,岩石强度随b的变化规律与传统模型预测的规律相差较大。α较大的情况下岩石表观强度通常会比较高。α较小的情况下,σ_2较小时岩石表观强度变大,σ_2较大时岩石表观强度变小。使用考虑三向应力的强度模型可以精确预测弱面在任意一角度时的岩石强度。
[Abstract]:The weak surface rock usually has obvious strength anisotropy. The general weak plane theory is to analyze the rock strength in the plane stress state, and can not accurately analyze all the weak plane conditions. With the help of Zhang Liang's coordinate transformation method, the shear strength model of rock on weak plane is established by calculating the stress component of weak plane on any azimuth of space. The results show that the effect of intermediate principal stress on rock strength is very large for single weak surface rock. When (intermediate principal stress) 蟽 _ 2 鈮，

本文编号：2012478