会议专题

EXPERIMENTAL STUDY ON DRAINED BEHAVIORS OF GRANULAR SOILS UNDER MONOTONIC SHEAR LOADING

Various stress-controlled drained monotonic shear tests on the Chinese Fujian standard sand of relative density 30% under complex initial consolidation conditions with different stress paths are conducted by using the soil static and dynamic universal triaxial and torsional shear apparatus. The mean principal stress is controlled unchanged in the process of tests. The coefficient of intermediate principal stress and orientation of principal stress are varied so that their influences on shear strength and deformation feature of saturated sand are explored. Test results show that under drained condition the sand presents obvious dilatancy. Coefficient of intermediate principal stress remarkably influences the stress-strain relationship in the process of shearing, but does not make obvious effect on volumetric deformation feature. The generalized shear stress reduces with increase of coefficient of intermediate principal stress. The above-mentioned phenomena do not relate to magnitude of initial consolidation stress ratio. Orientation of principal stress also influences remarkably on monotonic drained shear features of sand. For different orientations of principal stress, variation pattern of stress-strain relationship depends on shear stresses on horizontal plane and vertical plane. Generalized shear stresses at phase-transformation state and at peak state and effective frictional angle are all parabolically related with orientation of principal stress. Meanwhile, orientation of principal stress influences in some extent on the amplification effect of coefficient of intermediate principal stress on effective friction angle. Base on the criterion for generalized twin shear stress, introducing a factor β0α for weighing the influence of orientation of principal stress,and combining with the test results, an expression for strength indices taking coupled effect of coefficient of intermediate principal stress and orientation of principal stress into account is obtained. The effects of shear history and loading rate on shear features of sand are not notable.

Drained Monotonic Shear Coefficient of Intermediate Principal Stress Orientation of Principal Stress Phase-Transformation State Peak State Effective Friction Angle

YI LENG MAOTIAN LUAN CHENGSHUN XU

Institute of Geotechnical Engineering, Dalian University of Technology, Dalian, 116024, P.R.China State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 1 College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100022, P.

国际会议

第三届中日岩土工程研讨会(Proceedings of the 3rd Sino-Japan Geotechnical Symposium)

重庆

英文

315-328

2007-11-05(万方平台首次上网日期,不代表论文的发表时间)