Foundation pit construction method suitable for soft substratum

Abstract

The invention discloses a foundation pit construction method suitable for a soft substratum. The method comprises the following steps that a waterproof curtain is constructed at the boundary positionof a foundation pit to be subjected to excavation, supporting piles are constructed on the inner side of the waterproof curtain, and the waterproof curtain and the supporting piles go deep into the soft substratum; multiple underground diaphragm walls perpendicular to the excavation longitudinal direction of the foundation pit are constructed in the longitudinal direction of the foundation pit tobe subjected to excavation, the bottoms of the underground diaphragm walls go deep into the soft substratum, and multiple composite foundation piles are constructed between the adjacent underground diaphragm walls; multiple reinforcing columns are constructed on the inner sides of the supporting piles, the reinforcing columns are fixedly embedded between the underground diaphragm walls and the supporting piles, and the bottom ends of the reinforcing columns go deep into the soft substratum; and foundation pit excavation is conducted until the first set depth is reached. According to the construction method, a supporting structure is high in reliability, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a foundation pit construction method suitable for weak underlying layers. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] In the construction of underground pipe trenches such as comprehensive pipe corridors, power tunnels, and rainwater box culverts, it is sometimes encountered that the foundation contains a deep and weak underlying layer. At this time, when excavating a deep foundation pit, not only foundation treatment is required, but the support of the foundation pit is also a difficult point of the project. The inventor found that at present, foundation pit support and foundation treatment are often designed separately. When encountering a deep and weak underlying layer, due to the weak physical and mechanical indicators of the w...

AI Technical Summary

Problems solved by technology

The inventors found that at present, foundation pit support and foundation treatment are often designed separately. When encountering a deep and weak underlying layer, due to the weak physical and mechanical indicators of the weak underlying layer, the ability to resist shear and lateral deformation is poor. The first foundation pit support design needs to go through the soft underlying layer and extend into the hard and stable soil layer below it. The construction cost is often high. Floor

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