Calculation method of active earth pressure of finite soil between retaining structure and existing buildings/structures

Abstract

The invention provides a method for calculating the active earth pressure of limited soil between a retaining structure and an existing building / structure. The calculation method includes determining various parameters of the design conditions of the retaining structure, setting the angle θ between the fracture surface of the limited soil body and the horizontal plane, and establishing the earth pressure equation of the limited soil body according to the static force balance condition on the sliding surface by using the geometric diagram method, The soil pressure of the finite soil body is derived from θ, and the equation is set to zero to obtain θ; according to the stratum conditions behind the retaining wall, there are two cases of non-cohesive soil and cohesive soil, and θ is verified and corrected according to the existing conditions to satisfy the limited After the soil condition is obtained, the active earth pressure of finite soil is substituted into the equation of active earth pressure of finite soil to obtain the active earth pressure of finite soil. Starting from reality, the present invention fully considers that the existing pile foundation of the building / structure blocks the sliding surface of the soil from extending to the ground, so that the calculated active earth pressure is more in line with the site conditions, and has a good effect on optimizing the design of the retaining structure and reducing the cost of the project. promotional value.

Description

Technical field [0001] The present invention relates to the field of civil engineering technology, specifically a retaining wall or other retaining structure and an existing building / structure between the finite soil active earth pressure calculation method used. Background [0002] In recent years, with the increasing tension of urban building land, there are a large number of construction projects in the construction of the retaining wall distance is very close to the existing building, so in the existing building basement wall or the existing building foundation and the retaining wall of the proposed support to form a limited width of the soil, its boundary conditions do not meet the basic assumptions of the semi-infinite body, so for the existing building basement wall or the existing building structure foundation and the retaining wall of the proposed support is a limited width of the soil pressure of the soil body belongs to the soil pressure of the limited soil body, Si...

AI Technical Summary

Problems solved by technology

[0002] In recent years, as the land for urban construction has become more and more tense, the distance between the retaining walls to be supported in a large number of construction projects in urban construction is very close to the existing buildings. Therefore, the basement walls of existing buildings or the foundations of existing buildings The soil mass with limited width is formed between the retaining walls to be supported, and its boundary conditions do not meet the basic assumption conditions of a semi-infinite body. The earth pressure of the finite-width soil between the walls belongs to the earth pressure of the finite soil. It is obviously inappropriate to simply apply the classical Rankine earth pressure or Coulomb earth pressure theory to calculate the earth pressure of the finite-width soil. The theoretical calculation of the earth pressure results There will be deviations, and the calculated value is larger than the actual value. The support of the retaining wall to be supported is too safe, which will increase the cost of the support and cause waste of resources.

[0003] At present, there are also some calculation methods for limited soil, but they are only limited to non-cohesive soil, the calculation of the slope is level, and the load on the slope is not considered. The calculation method has many restrictive conditions and does not meet the actual situation.

Images