关于剪切指标标准值的研究  

Discussion of Subsurface Soil Design Shear Strength for a Metro Station in Suzhou

作　　者：赵翀[1] 李键[1] ZHAO Chong;LI Jian(Tianjin Municipal Engineering Design Research Institute,Tianjin 300051)

机构地区：[1]天津市市政工程设计研究院

出　　处：《土工基础》2018年第6期665-667,共3页Soil Engineering and Foundation

摘　　要：对苏州某地铁车站内不同地基土层采用多种室内试验方法来定量描述其剪切指标标准值,探索各种条件下室内试验所得出的地基土层剪切指标标准值的差异。发现采用直接快剪、固结快剪、三轴UU、CU试验来确定地基土层剪切指标标准值得出的结果是不同的,且不同试验方法得出的结果试验数据差异较大;直接快剪得出的黏聚力普遍比固结快剪得出的黏聚力要高,而内摩擦角则相反;对粉质黏土、黏土,三轴UU得出的内摩擦角值非常低,接近理论试验意义上的0,且三轴UU得出的黏聚力均比直接快剪得出的内摩擦角要高;三轴CU得出的总应力条件下的内摩擦角和黏聚力普遍较固结快剪得出的剪力指标要高。The design shear strength values of different soil layers for the design and construction of a metro station in Suzhou City obtained from various laboratory tests were statistically analyzed.It is concluded that the shear strength values from different test methods,such as,unconsolidated undrained direct shear,consolidated undrained direct shear,unconsolidated undrained triaxial shear,consolidated undrained triaxial shear,are different.Further,significant variation in shear strength values could be obtained from different test methods.The cohesion values obtained from the undrained unconsolidated direct shear are higher than those of from consolidated undrained direct shear tests.The internal friction angle,other the other hand follows the reverse relationship.The internal friction angles from silty clayey sample in triaxial unconsolidated undrained shear test re very small and close to zero,which is the theoretical value.The cohesion values obtained from triaxial unconsolidated undrained shear test are higher than those of from unconsolidated undrained direct shear tests.Under total stress conditions,the internal friction angle and cohesion values obtained from consolidated undrained triaxial shear tests are higher than those of from direct shear tests.

关 键 词：剪切指标标准值 直接快剪 固结快剪 三轴CU 三轴UU 

分 类 号：TU411[建筑科学—岩土工程]