A dynamic adjustment method for the prestress of the horizontal support in the excavation of the foundation pit close to the large load and eccentric pressure

Abstract

The invention relates to a determination and adjustment method of support prestress values of transverse supports of a foundation pit under the condition near large load bias, the method includes thesteps that firstly, an earth pressure function of the edge wall of the foundation pit is calculated; and secondly, according to the earth pressure function, prestress values of all levels of the transverse supports are determined. According to the method for calculating the to-be-applied prestress values by the transverse supports at different levels in the foundation pit according to the condition of bias load distribution, engineering workers can quickly and efficiently adjust supporting parameters of the transverse supports of the foundation pit dynamically according to the bias load condition existing in the site, thus construction safety and reliability are improved, and the practical engineering value is achieved.

Description

technical field [0001] The invention relates to the technical fields of foundation pit support, excavation of urban subway stations, etc., in particular to a method for determining and adjusting parameters of subway foundation pit support under the condition that the city is close to a large bias load. Background technique [0002] During the excavation of the foundation pits of urban subway stations, there are often large structures near the foundation pits. Due to their own gravity, the large structures will squeeze the surrounding soil. When excavating the foundation pit, the soil in the surrounding area needs to be Pre-reinforcement is carried out, otherwise it will cause excessive displacement of the side wall of the foundation pit after the excavation of the foundation pit due to excessive extrusion stress of the soil, and cracks or even instability of the foundation pit wall will occur. After the excavation of the foundation pit, a common method of supporting the foun...

AI Technical Summary

Problems solved by technology

Therefore, the prestress applied in the cross brace should be moderate, neither too large nor too small. If the prestress is too small, the supporting force will be insufficient and the deformation of the foundation pit will not be stable; if the prestress is too large, the It will cause the surrounding soil to uplift and cause damage to the surrounding existing buildings.

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