大理岩卸围压幂函数型Mohr强度特性研究  

POWER FUNCTION BASED MOHR STRENGTH CRITERION FOR MARBLE WITH UNLOADING CONFINING PRESSURES

作　　者：陈卫忠[1,2] 刘豆豆[3] 杨建平[1] 谭贤君[1] 王崇革[4] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]山东大学岩土与结构工程研究中心,山东济南250061 [3]山东财政学院工商管理学院,山东济南250014 [4]山东科技大学土木建筑学院,山东青岛266510

出　　处：《岩石力学与工程学报》2008年第11期2214-2220,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金委雅砻江水电开发联合研究基金项目(50579087,50539050);国家高技术研究发展(863)计划资助项目(2007AA11Z108);国家自然科学基金委西部重大研究计划(90510019);中国科学院西部行动计划高新技术项目(KJCX2–YW–506)

摘　　要：对大理岩进行三轴试验和峰前、峰后卸围压试验。研究结果表明:直线型Mohr-Coulomb强度准则不能很好地反映大理岩峰前、峰后卸围压的强度特征;提出非线性Mohr强度准则——幂函数型Mohr强度准则;推导并做出了其在π平面上的屈服曲线,与Mohr-Coulomb强度准则在π平面上的屈服曲线进行比较。研究结果表明,幂函数型Mohr强度准则比直线型Mohr-Coulomb强度准则能更好地描述大理岩的强度特征。Conventional triaxial test and pre- and post-peak unloading confining pressure tests of marble have been performed. Mohr stress circles under different confining pressures and envelopes are achieved. The results indicate that linear Mohr envelope can not match stress circle very well; and the Mohr-Coulomb criterion describing marble strength will bring large error. In order to solve the problem, a nonlinear Mohr strength criterion is proposed, i.e. power function Mohr strength criterion, to fit the test data and compare the theoretical values and test values. The failure curve of power function Mohr strength criterion in π plane is presented; and the failure curve of Mohr-Coulomb strength criterion is then compared. It is shown that the power function of Mohr strength criterion can describe marble strength much better.

关 键 词：岩石力学 卸围压 幂函数强度准则 

分 类 号：TU457[建筑科学—岩土工程]