荆州城区黏性土三轴与直接剪切试验强度对比分析

The Comparison and Analysis Between Jingzhou Clay Strength Parameters Measured by Triaxial Shear Test

直接剪切试验与三轴试验是测试土体强度参数的2种方法,2种试验方法各有其优缺点,比较土体三轴与直接剪切条件下的土体强度参数有积极的应用价值。以荆州城区黏性土为对象,进行直接剪切与三轴剪切试验(不固结不排水试验(UU)、固结不排水试验(CU)),比较不同试验方法下土体的强度参数,讨论不同试验方式和排水条件对土体抗剪强度参数的影响。在相同黏性土的情况下,UU试验的黏聚力大于CU试验,而内摩擦角远小于CU试验;UU试验的黏聚力大于直接剪切试验,而内摩擦角小于直接剪切试验;CU试验的黏聚力和内摩擦角均略大于直接剪切试验;UU试验的黏聚力最大,CU试验的内摩擦角最大。

Direct shear test and triaxial test are the two methods of testing soil strength parameters.Both of the two test methods have their own advantages and disadvantages,the comparison of soil strength parameters measured by direct shear test and triaxial shear test respectively is very meaningful.In this paper,direct shear and triaxial shear test(unconsolidation undrainage test(UU),consolidated undrainage test(CU))are used to test the shear strength parameters of Jingzhou clay and discuss the impact of different test methods and drainage conditions on soil shear strength parameters.According to the analysis,in the same case of clay,the cohesion of UU test is greater than that of CU test,the angle of internal friction is much smaller;the cohesion of UU test is greater than that of shear test,the angle of internal friction is smaller;in the CU test the cohesion and the angle of internal friction are slightly greater than that of shear test;UU test has the greatest cohesion,and CU test has the greatest angle of internal friction.