考虑主应力轴旋转效应的交通荷载下饱和软黏土变形特性试验-NSFC.PDF

35 5 Vol.35 No.5 2016 5 Chinese Journal of Rock Mechanics and Engineering May 2016 12 12 12 (1. 200092 2. 200092) 2 () TU 43 A 2016 Experimental study on deformation behavior of saturated soft clay under traffic loading considering effect of principal stress rotation DU Zibo12 QIAN Jiangu12 HUANG Maosong12 (1. Department of Geotechnical EngineeringTongji UniversityShanghai 200092China 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of EducationTongji UniversityShanghai 200092China) Abstract A series of undrained tests were conducted with hollow cylinder apparatus for undisturbed saturated soft clay under coupled loading path of principal stress magnitude and principal stress rotation induced by traffic loading. The effects of principal stress rotation on pore pressuredeformation and stress-strain relationship were studied by comparing the results of cyclic triaxial tests and traffic loading path tests. The effects of the generalized shear stress level on the stiffness of stress-strain and non-coaxiality were also investigated. Test results show that compared to cyclic triaxial teststhe pore pressure and strain are significantly larger and the stiffness of stress-strain loops experiences a dramatic reduction under principal stress rotation induced by traffic loading. During cyclic coupling loadingtwo different cyclic responsesi.e.the shear stress-strain relation and the normal differential stress-strain relationwere observed. The shear stiffness over stress-strain loops exhibited an anisotropic