Abstract
The character of geomaterials is affected by stress path remarkably. Under different stress paths, the stress-strain characteristics of geomaterials are difference. For the unloading path in existing engineering situation, the physical parameters and constitutive model is usually determined by loading test. The path to uninstall the actual project conditions which may be a larger error. Therefore, this work proceeding from the actual project, deep excavation of the lateral unloading condition is analysed. The tests of CTC path and RTC path on silty clay in Huangshi city of china by multi-path tri-axial plane strain are carried on in the geotechnical Engineering Laboratory of Huangshi Institute of Technology. Then, the phenomenon under the two stress paths are compared with each other and describing the differences between them. The mechanical properties in the RTC stress path is analyzed mainly. Based on the Cam-Clay model framework, then derived this material yield equation based on Cam-clay model, Laiding the foundation for the numerical analysis.
Highlights
Soil is a complex material, its properties depends on the nature of the current stress state, and the soil type, stress history and follow-up on the loading direction
Li [5] use GDS tri-axial apparatus to five types of stress path tri-axial tests were conducted on K0consolidated Wenzhou saturated soft clay under undrained conditions, analysis of different stress - strain relationship of soil mass under the stress path, the path of development of pore pressure and effective stress
The results show characteristics of the soil exist significant difference under different stress paths
Summary
Soil is a complex material, its properties depends on the nature of the current stress state, and the soil type, stress history and follow-up on the loading direction. Li [5] use GDS tri-axial apparatus to five types of stress path tri-axial tests were conducted on K0consolidated Wenzhou saturated soft clay under undrained conditions, analysis of different stress - strain relationship of soil mass under the stress path, the path of development of pore pressure and effective stress. In order to study deformation and strength characteristics of the soil under different stress paths, some scholars [8,9,10] have conducted site monitoring and stress path tri-axial tests. Zhang et al [10] research results concluded that unloading stress path test results compared with the conventional tri-axial loading test have significant differences, the development can describe unloading stress path of soil constitutive model is necessary, the soil mass in accord with the Engineering practice of excavation of the deformation and stress analysis are necessary. This work is based on the constitutive model framework Cambridge, the model was modified by testing, obtained the modified Cambridge model based on this material
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
