Informatics Publishing Limited

Gao Xiuqing ¹, Liu Chengbin ¹, Zhang Hao ¹, Zhou Yichao ¹

Affiliations
1 Department of Hydraulic and Architectural Engineering, Beijing Vocational College of Agriculture, Beijing, CN

Abstract

The shield construction is used from Xitieying staiton to You'anmen outside station in a subway project in Beijing (hereafter, the Project). The risk identification revealed 10 major types of hazards that may arise from shield tunneling in the Project. The P=R×C  risk assessment method is adopted to carry out the risk grading of engineering, and the main factors of risk are the four Class 4 hazards, i.e. underground pipeline damage (u2), surface subsidence (u3) and shield spewing out water (u4), as well as one Class 5 hazard, i.e. damage to surrounding buildings or structures (u1). The method combines the qualification with quantification, localizes every rick factor and then guild the risk control and management.

Keywords

Risk Assessment, Fuzzy Comprehensive Evaluation, Risk Identification.

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Liu Chengbin ¹, Gao Xiuqing ¹, Zhang Hao ¹, Bao Shibo ¹

Affiliations
1 Department of Hydraulic and Architectural Engineering, Beijing Vocational College of Agriculture, Beijing, CN

Abstract

The shield construction is used from Xitieying staiton to You'anmen outside station in a Beijing subway project. When the tube sheets break away from the the shield tail, an annular gap will be formed between the soil and the tube sheets. The paste can reduce the ground subsidence and even collapse when it is synchronously grouted to the annular gap. After filling, the soil pressure on the tube sheet can improve the early stability and the sealing property of the tube sheet lining. The hardening filling layer can also serve as waterproof; it has waterproof effect, but also can improve the strength and durability of the tunnel lining structure. Due to the flexible construction method, short construction period, low cost and so on, the synchronous grouting method has become a common method in shield construction.

Keywords

Subway, Shield Tunnel, Synchronous Grouting.

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