摘要
分析了裂纹岩体中水压力的作用及类型,在探讨静水压力、动水压力及水化学损伤对裂纹尖端应力强度因子影响的基础上,推导出了考虑水压力和水化学损伤作用等不同条件下的含闭合或张开裂纹的岩体断裂强度新准则,并发现:水对含结构面(裂纹或节理)岩体的断裂力学效应的作用包括直接与问接作用两方面,直接作用来源于裂纹中的静水压力或动水压力,间接作用来源于水对裂纹面上的剪切强度(粘聚力与内摩擦角)的损伤、水对岩体断裂强度的作用,对于裂纹是否闭合,在新准则中有不同的表达式。
Based on analysis on the effects of water pressure and chemical damage on the stress intensity factor of crack in rocks,a new fracture strength criterion is put forward for the rocks with cracks under water pressure and chemical damage.This new criterion can quantitatively reflect the effects of static water pressure,dynamic water pressure or hydraulic gradient and water chemical damage.The effects of water on the fracture strength criterion of rocks with cracks result not only from static or dynamic water pressure of crack in rocks,but also from chemical damage of water on the internal friction and coherence of crack in rocks. Thus the expressed formulas in the new fracture strength criterion of rocks correspond to the different cases of the crack in rocks with or without closing.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2003年第z1期2154-2158,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金(50279056
59779019)
广东省自然科学基金(970127)资助项目.
关键词
断裂力学
水
岩体
裂纹
应力强度因子
断裂强度
fracture mechanicsw
ater
rocks
crack
stress intensity factor
fracture strength
