K_0固结饱和粘土三轴压缩与拉伸循环强度之间的关系  

Relationship between triaxial compression and tensile cyclic strengths of k_0 consolidated saturated clays

作　　者：王建华[1] 赵晨玲[1] 赵致艺[1] 

机构地区：[1]天津大学岩土工程研究所,天津300072

出　　处：《世界地震工程》2010年第S1期13-17,共5页World Earthquake Engineering

基　　金：国家自然科学基金项目(50879055)

摘　　要：针对有应力反向与无应力反向两种循环应力条件,进行了k0固结饱和粘土不排水循环三轴压缩与拉伸强度试验。为了分析三轴压缩与三轴拉伸循环强度之间关系,依据3个围压下三轴压缩循环强度试验结果,确定了与不同循环破坏次数对应的Mohr-Coulomb循环强度指标。据此预测k0固结土样三轴拉伸循环强度,预测结果小于实测结果,当循环破坏次数为2 000时,两者之间相对偏差为13%左右。因此,可以依据Mohr-Coulomb强度理论建立k0固结饱和粘土不排水三轴压缩与拉伸循环强度之间的关系。Undrained cyclic triaxial compressive and tensile tests are conducted under non-reversal and reversal stress conditions for the k0 consolidated saturated clay.Mohr-Coulomb cyclic strength parameters corresponding to different cyclic numbers of destruction are determined based on cyclic triaxial compressive test results under three confining pressures to analyze the relationship between cyclic strengths determined using cyclic triaxial compressive and tensile tests.Cyclic triaxial tensile strengths of k0 consolidated saturated clay are predicted using the Mohr-Coulomb cyclic strength parameters.Predicted results are less than test results.Relative error between predicted and tested results is about 13% when the cyclic numbers of destruction is 2 000.Therefore,the relationship between triaxial compression and tensile cyclic strengths of k0 consolidated saturated clays can be described using Mohr-Coulomb strength theory.

关 键 词：k0固结饱和粘土 粘土循环强度 土动力特性 土强度理论 

分 类 号：TU435[建筑科学—岩土工程]