Numerical Simulation Analysis of Deep Foundation Pit Engineering Based on HS-Small Constitutive Modell

Abstract

Numerical simulation has become one of the most important means of foundation pit engineering analysis, but there is a lack of numerical simulation of deep foundation pit engineering examples under the condition of adjacent buildings in Xi ’ an. In this paper, MIDAS GTS NX software is used to simulate the deep foundation pit engineering of Xi ’ an International Conference Center Phase II by using the Hardening Soil-Small constitutive model which is more suitable for foundation pit engineering. Combined with the measured data, the study on the characteristics of building settlement, the characteristics of surrounding surface settlement, the deformation characteristics of foundation pit retaining structure, the soil pressure at pile side and the variation characteristics of pile internal force is conducted under the condition of stepwise excavation-reduction of groundwater level of foundation pit. The results show that the top displacement of the retaining structure and surface settlement near the building are larger than those without load. The building settlement and surface settlement rate present the characteristics of medium-term slowdown. The lateral earth pressure and internal force of pile show different trends in free section and anchorage section, affected by building load. The simulation results of the constitutive parameters of HHS numerical simulation determined by parameter inversion are in good agreement with the measured data, which verifies the reliability of HHS constitutive model in the numerical simulation of foundation pit engineering in Xi ’ an area, and provides reference for the numerical simulation of similar engineering cases in relevant areas.