Abstract
The impact of deep excavation to the stability of adjacent slope is evaluated based on the slip line theory. Stress field of slope under various excavation conditions is simulated by finite element method, while slip line field is determined by non-associated flow rule. Factor of safety is obtained by integrating the skid-resistance and the shear stress on each slip line, and the slip line with minimum factor of safety corresponds to the critical slip surface. Two typical displacement constraint boundaries are considered. The results indicate that the critical slip surface moves towards to the slope surface and develops downwards. The factor of safety decreases with the excavation process. For flexible displacement constraint boundary, large deformation of supporting pile causes obvious variation of critical slip surface and factor of safety. In terms of the stiff displacement constraint boundary with internal supports, deep excavation only has limited effect on the slope stability.
Highlights
The buildings are extensively crowded with the rapid development of city, leading to complex construction sites for deep excavation
Zhu et al [9] proposed a more practical “potential slip line theory” by treating soil as elastoplasticity material. This method is able to calculate the factor of safety and identify the critical slip surface of slope based on the stress field generated by finite element method (FEM)
To simulate the stress filed during excavation by FEM, the calculation process can be divided into several steps: (1) The initial stress field {σ0} and displacement field {δ0} in the site caused by deadweight and external load are calculated before deep excavation
Summary
The buildings are extensively crowded with the rapid development of city, leading to complex construction sites for deep excavation. According to the theory of plastic mechanics, slip line method is to take the soils as a rigid-plastic material and generate a slip line field for the ultimate volume force which satisfies the boundary conditions [6,7,8]. Zhu et al [9] proposed a more practical “potential slip line theory” by treating soil as elastoplasticity material This method is able to calculate the factor of safety and identify the critical slip surface of slope based on the stress field generated by finite element method (FEM). The stress fields of slope under various excavation conditions are simulated by FEM, considering the stiffness of supporting structure. The slip line with the minimum factor of safety is the critical slip surface of slope for various excavation conditions.
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