A design method of foundation pit supporting structure applied to the finite width soil behind the wall

Abstract

The invention provides a design method of a foundation pit supporting structure applied to a finite width soil behind a wall. The method comprises the following steps: determining soil required for design, structural parameters, and completing the selection of the foundation pit supporting structure type and the preliminary design scheme of each section; determining the critical soil width (critical value) which affects the distribution of soil pressure behind the wall, if the width of soil behind the wall is less than or equal to the critical value, determining the earth pressure load of finite width soil by a thin layer element method, otherwise, adopting conventional triangular or trapezoidal earth pressure load distribution; in the thin-layer element method, introducing the relationship between wall displacement and friction angle to calculate the non-limit earth pressure load. According to the obtained earth pressure load, the load structure analysis method is used to calculate the internal force of the supporting structure, and the design of the supporting structure is completed. The method can effectively determine the mechanical deformation of the supporting structure in the excavation process of the foundation pit, and provides a more economical design method for the foundation pit engineering under the condition of the finite soil mass width behind the wall.

Description

technical field [0001] The invention relates to the field of foundation pit engineering calculation, in particular to a foundation pit support structure design method applied to a soil body with a limited width behind a wall. Background technique [0002] With the rapid development of urban underground space, it is more and more frequent that foundation pit projects are adjacent to existing buildings, so that there is often a limited width of soil between the foundation pit to be excavated and the existing buildings. As pointed out by Yang Minghui et al. in the article "Experimental Study on Active Earth Pressure of Cohesive Soil with Limited Width Behind the Wall" in Chinese Journal of Geotechnical Engineering (Vol.38No.1, P131-137, 2016), when the soil behind the wall has a limited width , the traditional Coulomb earth pressure calculation formula is no longer applicable to non-cohesive soils. Therefore, if the traditional earth pressure calculation method and foundation ...

AI Technical Summary

Problems solved by technology

Therefore, a set of design methods for foundation pit support structure applied to the condition of limited width soil behind the wall has not yet been formed.

Images