Unloading Mechanical Effect Analysis of Retaining Structure of Deep Foundation Pit in Soft Soil

Abstract

The large-scale foundation pit construction site is small in area and complicated in conditions, which is easy to affect the environment. At the same time, it is prone to cracking or even collapse of nearby buildings due to uneven surface. The low-ranking official network around the foundation pit is easily damaged, and the surrounding roads are cracked. Many problems. At the same time, soft soil has the characteristics of high compressibility, low strength, large water content and small bearing capacity. It shows remarkable structural and rheological characteristics, which makes it more and more challenging to ensure the safety and stability of soft soil foundation pit engineering. In this paper, the deep foundation pit deformation of super soft soil is predicted and controlled, and the deep foundation pit engineering of soft soil is taken as the research object. The mechanical characteristics of soil unloading process are discussed, and the strength and deformation law of unloading soil are studied. The actual constitutive model and soil parameters are numerically simulated by the finite element method, which objectively reflects the mechanical state of the foundation pit excavation unloading soil, which is of great significance to ensure the safety and long-term stability of large underground engineering construction.