水压力作用下岩石中Ⅰ和Ⅱ型裂纹断裂准则  

Analysis of fracture criterion ofⅠ and Ⅱ type of crack in rock masses under hydraulic pressure

作　　者：高赛红[1,2] 曹平[1] 汪胜莲[2] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]江西理工大学应用科学学院,江西赣州341000

出　　处：《中南大学学报（自然科学版）》2012年第3期1087-1091,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(10972238;51174228)

摘　　要：为了研究裂隙岩体在水作用下的损伤断裂机制,考虑水产生的垂直裂纹面的静水压力和平行裂纹面的拖拽力,分析处于压剪和拉剪状态的单裂纹应力状态,推导出水作用下裂纹的应力强度因子。还定义基于断裂韧度的损伤变量,并将损伤变量引入Dugdale裂纹模型,推导出水损伤作用下压剪和拉剪应力状态下裂纹的应力强度因子。基于压剪条件下的断裂准则和最大周向应力理论,推导出压剪和拉剪应力状态下,考虑水损伤作用的裂隙岩体断裂准则。In order to study damage fracture law of fissured rock masses, the hydrostatic pressure vertical to crack surface and drag force parallel to crack surface were taken into consideration, both of which are generated by water action. Stress condition of single crack under compressive-sheafing stress condition and tensile-shearing stress condition were calculated respectively. And the stress intensity factor during water action was deduced. A new damage variable related to fracture toughness was presented and the new damage variable was introduced into Dugdale crack model, and the stress intensity factor of compressive-shearing crack and tensile-sheafing crack were deduced respectively. Finally, fracture criterion of fractured rock mass considering water damage action was presented, under compressive-shearing stress condition and tensile-sheafing stress condition respectively, based on the compressive-shearing fracture criterion and the maximum hoop stress theory.

关 键 词：压剪裂纹 拉剪裂纹 断裂韧度 损伤断裂 断裂准则 

分 类 号：TU452[建筑科学—岩土工程]