考虑抗拉强度的岩石强度准则对比分析  

A COMPARISON STUDY OF ROCK STRENGTH CRITERIA CONSIDERING TENSILE STRENGTH

作　　者：张磊[1] 刘保国[1] ZHANG Lei LIU Bao-guo(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程力学》2016年第11期201-207,共7页Engineering Mechanics

基　　金：国家科技支撑计划项目(2013BAB10B06)

摘　　要：岩石强度准则的研究一般着重于抗压强度而忽略抗拉强度,抗拉强度是岩石的一个重要力学性质,在工程设计中是一个重要的力学参数。该论文采用五种岩石的室内岩石力学试验数据对四种强度准则进行拟合,以对抗拉强度的描述精度、最小平均标准拟合差和拟合的主应力间关系曲线综合评价强度准则与试验值的吻合性,探究不同的强度准则对抗拉强度的预测效果。分析表明:指数强度准则拟合值与试验值最接近,描述精度最好,评价不同应力状态下岩石的强度特征优先考虑指数强度准则。Most studies on rock strength criterion usually focus on the compressive strength, paying little attention to the tensile strength. However, as one of the most important mechanical properties of rocks, tensile strength is a key parameter in rock engineering design. Based on laboratory experimental data of five types of rocks, four strength criteria were assessed. The comprehensive evaluation of strength criterion was compared with the test results in terms of the precise description of the tensile strength, the minimum average standard fitting deviation and the main stress fitting curve. Effects of different strength criteria on the prediction of tensile strength were investigated. Results showed that, compared with other three strength criteria, the exponential strength criterion was the closest to the test values with the best precision. Therefore, exponential strength criterion is recommended to evaluate rock strength characteristics under different stress states.

关 键 词：岩土工程 抗拉强度 强度准则分析 平均标准拟合差 主应力关系曲线 

分 类 号：TU452[建筑科学—岩土工程]