Construction method using collapse region as subway tunnel foundation

Abstract

The invention discloses a construction method using a collapse region as a subway tunnel foundation. The construction method comprises the following steps that the collapse range is subjected to region division through analytical calculation, and three regions of a stable region, an unstable region and an anchor rod pile reinforcement region are obtained; the stable region is subjected to pile foundation construction; the unstable region is subjected to cable-stayed anchor cable construction; anchor rod piles are anchored in the collapse region, and grouting reinforcement is conducted; and pouring construction is conducted on underground beams, and the three reinforced regions are connected into a whole. The construction method has the beneficial effects that the steps are simple, design is reasonable, and implementation is easy; meanwhile, various factors such as a construction technology, the construction period, feasibility of a reinforcement scheme, the reinforcement effect and thereinforcement cost are considered, the effect of the reinforcement scheme is subjected to effect evaluation through numerical simulation analysis and on-site test methods, both the foundation bearingcapacity and the compressive strength meets design requirements, the collapse region can serve as a foundation of a newly-built subway tunnel structure, and the construction period is also shortenedgreatly while the reinforcement cost is saved.

Description

technical field [0001] The invention relates to the technical field of subway tunnel construction, in particular to a construction method using a subsidence area as a foundation of a subway tunnel. Background technique [0002] How to ensure the stability of the foundation of the subway tunnel is a major technical problem that must be solved first in the construction of the subway. In most cases, the problem can be solved by choosing a reasonable site and taking appropriate conventional technical measures during the survey and design stage of the subway construction. [0003] However, there are exceptions. Due to various conditions, the newly-built Urumqi City Rail Transit Line 1 must pass through the two subsidence areas of the Liudaowan Coal Mine (commonly known as Nandacao and Beidacao). There is no new subway tunnel built on the coal mine subsidence area. There are no precedents for reference. Therefore, how to safely pass through the subsidence area to ensure the long-...

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Problems solved by technology

[0003] However, there are exceptions. Due to various conditions, the newly-built Urumqi City Rail Transit Line 1 must pass through the two subsidence areas of the Liudaowan Coal Mine (commonly known as Nandacao and Beidacao). There is no new subway tunnel built on the coal mine subsidence area. Precedents, no successful experience to learn from

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