Youliang Chen

Experimental study on mechanical properties of granite after freeze–thaw cycling

It is important to understand the effect of freeze–thaw cycles on the mechanical properties of rocks. In this paper, the variation of the uniaxial compressive strength, peak strain, elastic modulus and stress–strain curves of granite subjected to freeze–thaw cycles with different heating temperatures were studied experimentally and the relationships were derived. As the number of freeze–thaw cycles increases, the compressive strength and elastic modulus decrease, while the peak strain decreases. In addition, an increased temperature increases the peak strain while decreasing the compressive strength and elastic modulus. An expression for the initial damage for the adopted rock material due to freeze–thaw cycling was proposed based on the Loland model. The current research has established a solid foundation for further experimental studies on the fatigue behavior of granite after freeze–thaw cycling.

Three-Dimensional Fem Analysis on Mechanical Characteristics of Deping Metro Station Foundation Pit During Project Excavation

Controlling the displacements of foundation pit walls and supporting structures is one of the most effective measures for ensuring safety of foundation pit construction. In this paper, the three-dimensional displacement field of Deping Station foundation pit, which is part of Shanghai Track Traffic Line 6 project, is computed by means of finite element method (FEM) and ANSYS software. Firstly, the element types and constitutive equations are selected. Secondly, the displacements and internal forces of supporting structures and soil medium are computed and the final computed results are analyzed. Finally, the sensitivity of computed results to dimensional variation of supporting structures and value variation of soil parameters is analyzed. The research result of current paper is very helpful for geotechnical construction and the development of geotechnical theory.