上海黏土强度特性真三轴试验研究  

Strength property of Shanghai clay in true triaxial tests

作　　者：盛佳韧[1] 武朝军[1] 叶冠林[1] 王建华[1] 

机构地区：[1]上海交通大学土木工程系,上海200240

出　　处：《岩土力学》2013年第1期47-52,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.41002097);上海市重点学科建设项目(No.B208)

摘　　要：利用自主改造的、大主应力与小主应力方向由刚性加压板加载、中主应力方向由围压室液压加载的自动控制刚柔复合真三轴仪,对上海原状软土进行同一π面上不同洛德角真三轴固结排水剪切试验。原状土样通过分块抽样法获取,共进行了5组不同洛德角(0°、15°、30°、45°和60°)排水剪切试验。试验结果显示,上海原状软土抗剪强度、屈服和破坏点位置随洛德角的增大而减小,体积变化量先增大后减小。三向应力状态下上海软土的破坏强度接近空间滑移面(SMP)破坏准则。A series of isotropic consolidated drained true triaxial tests with different Lode angles in the same π plane are carried out with an automatic controlled mixed boundary true triaxial apparatus.The maximum and minor principal stresses are applied by two pairs of rigid platens;and the intermediate principal stress is applied by water pressure in triaxial cell.Undisturbed soil sample is prepared by block sampling method;and totally 5 drained tests with different Lode angles（0°,15°,30°,45°,60°） are presented.Test results show that the shear strength,the yielding failure points of Shanghai soft clay decrease while Lode angles increase.The volume change increases first and turns to decrease when Lode angle is larger than 30°.In general,three-dimensional strength of the Shanghai soft clay obeys the SMP（spatial mobilized plane） failure criterion.

关 键 词：真三轴试验 上海黏土 排水剪切试验 洛德角 

分 类 号：TU411[建筑科学—岩土工程]