Support system and implementation method for synchronous excavation of asymmetric deep and large foundation pits in soft soil areas

Abstract

The invention discloses a synchronous excavation supporting system for a deep and large asymmetric pit in a soft soil area and an implementation method of the supporting system. The deep and large asymmetric pit consists of a deep area and a shallow area which are internally close to each other, the top elevation of an enclosure structure at the junction of the deep area and the shallow area is a substrate of the shallow area, the total pit is provided with a first horizontal support in a unified way, the deep area is additionally provided with a plurality of deep-area horizontal supports, a soil body platform used for balancing the horizontal transfer force of the deep-area horizontal supports is reserved at the junction of the interior of the shallow area and the deep area, and two sides of the soil body platform are sloped to the substrate of the shallow area, so that open excavation and bottom-up construction in the deep area and the shallow area can be synchronously carried out, the problem of imbalance of the internal force and the deformation of the pit caused by an asymmetric excavation mode due to function requirements is solved, and the asymmetric pit can be excavated in a safe, reliable, economic and environment-friendly mode; through the synchronous excavation of the deep area and the shallow area, the construction period can be effectively shortened, and the construction cost is reduced; moreover, the supporting system is definitely stressed, the horizontal force of each horizontal support additionally arranged in the deep area is reliably transferred, and the construction feasibility is high.

Description

technical field [0001] The invention relates to the field of geotechnical engineering design and construction, in particular to a novel support system and an implementation method for a large-scale asymmetric deep foundation pit project in a deep muddy soft soil layer under the requirement of a synchronous excavation period. Background technique [0002] In recent years, in the process of comprehensive development and reconstruction of urban underground space in soft soil areas, many asymmetric deep and large foundation pits with inconsistent internal excavation depths have appeared due to different utilization depths. Previously, most of the studies on the deformation properties of the enclosure structure and the environmental effects caused by the excavation and dewatering of foundation pits were based on symmetrical foundation pits with the same excavation depth. However, the stress and deformation of different parts of the asymmetric foundation pit support system Impact ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a support system and implementation method for synchronous excavation of asymmetric deep and large foundation pits in soft soil areas. The first horizontal support is uniformly arranged in the entire foundation pit, and several deep horizontal supports and junctions are added in the deep area. The support method of the reserved soil platform solves the problem of unbalanced internal force and deformation of the foundation pit caused by the asymmetry of the excavation method due to functional requirements, ensuring the safety, reliability, economy and environmental protection of the foundation pit excavation, and realizing deep, The schedule requirements for synchronous excavation in the two shallow areas can effectively shorten the construction period and reduce construction costs

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