Limited Soil Earth Pressure Theory Of Computation And Its Application In Engineering

The pit problem has always been an important issue in geotechnical engineering,and the deep pit problem is a hot issue.With the urban modernization and urban replanning in the era of large-scale infrastructure,the utilization rate of land in some ultra-first-tier cities has been increasing year by year.The construction density of urban buildings and structures,including underground pipelines that are currently being vigorously built,continues to increase,and the foundations of super-high-rise buildings are increasing.The depth of deep burial pits has deepened,and the distance between structures of underground buildings has been getting smaller and smaller.Previous scholars have shown that in this case,it is no longer possible to continue to use classical earth pressure calculation methods that have been widely used.Method calculations are likely to cause a lot of waste.This article mainly aims at the calculation of the earth pressure of the limited soil and the optimization of the foundation pit design under this condition when the distance between the planned underground building and the existing building appears in the modern construction.The main contents include the following aspects:(1)Based on previous researches on limited soils,based on the basic principle of limit equilibrium theory,a finite soil calculation model considering the influence of factors such as the upper part of soil and the existing building foundation reaction force was used to derive the viscosity.Soil pressure equations for finite soils under soil and non-cohesive soils,and soil pressures for finite soils under special conditions,and Inferential reasoning formula the relationship between slip angles.(2)By analyzing the actual situation of the limited soil,a more realistic numerical simulation model was established,and the corresponding quantitative relationship between the earth pressure and many factors was obtained through orthogonal test analysis.(3)Through the two methods of theoretical formula and numerical simulation,the influence of different factors on the earth pressure of limited soil was analyzed,and the differences between different calculation methods were obtained.(4)Through the monitoring data of the actual engineering of the Chegongmiao junction station in Shenzhen,the methods were compared by comparing the deformation and the contrasting earth pressure,which proved the reliability of the formula deduced in this paper.(5)Through the orthogonal experiment method,the influence of various factors on the deformation of the foundation pit under the finite soil condition was studied,and the relationship between the deformation of the foundation pit and the main factors of the limited soil and the envelope structure was obtained.