节理的剪切强度准则和剪切分量Ⅰ:剪切强度准则  

Shear strength criterion and shear components of rock joints I: Shear strength criterion

作　　者：唐志成[1] 刘泉声[1] 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《岩土工程学报》2015年第2期292-298,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学青年基金项目(41402247);国家重点基础研究发展计划项目(2014CB046904);国家自然科学重点基金项目(41130742);第55批中国博士后科学基金(2014M550407)

摘　　要：节理的峰值剪切强度受表面三维形貌和材料力学属性的影响,已有的文献着重阐述形貌参数的重要性。总结分析了材料的抗拉强度对节理剪切力学性质的影响。采用最大可能接触面积比、最大视倾角、视倾角分布参数描述节理沿剪切方向的三维形貌特征,用双曲线函数描述不同法向应力下的剪胀角,提出新的剪切强度准则,计算值与试验值保持了较好的一致性。采用其中28组岩石节理的直剪试验数据对新准则与JRC-JCS准则进行了比较,结果表明JRC-JCS准则的计算值与试验值相比差异更大。新准则采用的形貌参通过由形貌测试确定,避免了主观因素对形貌参数取值的影响,可用用于估算岩石节理的峰值剪切强度。The peak shear strength of rock joints is influenced by both the surface morphology and the mechanical parameters of joint materials. In the existing references, special attention has been paid to the importance of roughness. Here, the importance of tensile strength of joint materials is discussed. The three-dimensional surface morphology along shear direction is captured by using the maximum potential contact area ratio, the maximum apparent inclination angle and the distribution of inclination angle. A new peak shear strength criterion is proposed, in which the dilatancy angle expressed by a hyperbolic function is used. A total of 85 sets of data are used to validate the criterion. The results show that there is good agreement between the calculated and measured values. 28 sets of data from natural rock joints are used to compare the new criterion and the famous JRC-JCS criterion. The discrepancy between the measured and calculated values by JRC-JCS criterion is something larger. The proposed criterion can be used as a predictive tool to evaluate the peak shear strength of rock joints owing to the fact that the roughness parameters can be easily obtained in the laboratory and the subjectivity can be avoided.

关 键 词：节理 三维形貌 峰值剪切强度准则 抗拉强度 

分 类 号：TU452[建筑科学—岩土工程]