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Study on Failure Criterion for Intact Soft Clay under Complex Stress Path

Author: ZhangXun
Tutor: WenXiaoGui;ZhouJian
School: Zhejiang University
Course: Geotechnical Engineering
Keywords: Intact soft clay Hollow cylinder torsional shear apparatus Rotation of principal stress Initial stress state Failure criterion
CLC: TU411.99
Type: Master's thesis
Year: 2010
Downloads: 142
Quote: 2
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Abstract


By scholars pit excavation unloading process, and the traffic load, seismic load, foundation soil unit summary of the results of the stress state in the wave loads, rotation of principal stress is the the soil unit stress state change the salient features . Obviously, the shear failure characteristics of the soil under the rotation of principal stress path and destroy the standard is one of the important issues of concern for the actual engineering design. Based on this, based on the southeast coast of China is widely distributed soft clay area construction needs, hollow cylinder torsional shear apparatus triaxial apparatus of routine testing, the SEM electron microscopy scanner typical Hangzhou intact soft clay, were considered early principal stress axes rotation series starting stress state changes the macro and micro test. The main work and results are as follows: 1. Carry out the principal stress axes unidirectional, forward and reverse, continuous cycle rotation and shear stress amplitude and direction of the principal stress axes simultaneously change the path the undrained test. The test results show that: (1) the principal stress axes rotation stage stress-strain its level is very small, the principal stress axes rotation stage given angle on the direction of the major principal stress control throughout the the shear stages of stress strain carry characteristics from the role of the late directional shear stage. (2) principal stress axes unidirectional rotating pressure to carry out characteristics of the entire shear stage hole has little effect on the principal stress axes, however, the forward and reverse continuous rotation and shear stress amplitude and direction of the principal stress axes simultaneously change the shear stage hole pressure to carry out feature. (3) the path of the principal stress axes rotation intact soft clay of strength for the entire shearing stage variation, the anisotropy strength by the directional shear late stage direction of the major principal stress angle control. 2. Carried out to consider the initial direction of the principal stress angle intermediate principal stress coefficient, initial shear stress, overconsolidation ratio change of principal stress axes rotation series macro and micro test. The test results show that: (1) the initial direction of the principal stress angle determines the shear deformation state, equal to a 45 ° angle to the initial direction of the principal stress. (2) as the principal stress coefficient increases, the pore pressure increment decreases first and then increases, but the the normalized intensity clay were regular changes, this is because the main stress factor is not affect intact soft clay owned by a different intensity anisotropy of the microscopic changes in factors. (3) initial shear stress and over-consolidation ratio changes in pressure in the hole of the shearing process to carry out characteristics influence, from pore pressure point to establish a failure criterion should be considered the initial shear stress and the impact of the consolidation ratio change. Undisturbed soft clay shear failure characteristics affect the basis of analysis of the principal stress axes rotation with the initial stress state changes undisturbed soft clay under complex stress path shear failure criteria of the study, the following conclusions: (1 further modifications) Lade-Duncan failure criterion, it intact soft clay shear failure characteristics apply this test the control system under analysis. (2) using the modified Lade-Duncan failure criterion to calculate different shear direction clay parameters and the limit pore water pressure, effective principal stress than the peak, given the generalized shear strain, principal stress difference compared to the peak shear failure criteria found intact soft clay shear tests under complex stress path should the principal stress difference as the shear failure of standard peak.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Soil Test > Laboratory tests (indoor soil test ) > Other soil test
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