基于格里菲斯强度的破裂区支反力研究  

Study on Counterforce of Broken Zone Based on Griffith Strength

作　　者：胡亚桥 荣浩宇 宋泽方[1] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001

出　　处：《煤炭技术》2018年第2期93-94,共2页Coal Technology

摘　　要：巷道开挖后会改变岩体的初始应力状态,围岩按变形状态可划分为塑性变形区和弹性变形区。但对于某些脆性岩体,尤其是其巷道周边的破裂区,由于受到较大的破坏,会有裂隙产生。在支反力pi的作用下虽保持稳定,但由于岩体内部存在许多随机分布的细微裂隙,岩体容易受拉破坏,更加适合用格里菲斯强度准则进行分析。在破裂区内,只要在支反力pi的作用下,围岩满足格里菲斯强度准则,巷道就不会破坏。同时,根据具体工程实例,只要巷道的最大变形量满足工程需要,根据相关参数,就可以得到巷道的最小支护力。It will change the stress state of rock mass after the excavation of tunnel, tile surroundingrock deformation can be divided into plastic deformation zone and elastic deformation area by state. Butsome brittle rock mass, especially for the roadway surrounding the rupture zone ,will have cracksbecause of considerable damage.Though it is stable in inverse support force p, but there are so manytiny cracks and random distribution in the rock, so thai the rock is easy to be damaged,and it becomesmore suitable for analysis by the Griffith criterion. In the cracked zone, as long as under the action ofthe inverse support force pi rock meets Griffith strength criterion, then the roadway won＇t be damaged.According to the relevant parameters, can get the minimum supporting force of the roadway.

关 键 词：破裂区 格里菲斯强度准则 支反力 

分 类 号：TU45[建筑科学—岩土工程]