A construction method for shield tunneling in water-rich sand layers to pass through existing pipelines at short distances and pass through sewage pipe jacking
A technology for a water-rich sand layer and a construction method, which is applied in earth-moving drilling, underground chambers, and shaft equipment, etc., can solve problems such as affecting normal operation, and achieve significant construction effects, significant social benefits, and good application prospects.
Active Publication Date: 2021-05-28
CHINA RAILWAY NO 3 GRP CO LTD +1
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Problems solved by technology
During operation, the tunnel will inevitably float up due to the unloading of the upper soil body. If the deformation is too large, it will affect its normal operation; due to the jacking process of sewage pipes, there is no foundation below, and the process of shield tunneling will inevitably cause settlement
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[0039] The specific embodiment of the present invention will be further described in conjunction with the accompanying drawings.
[0040] A construction method for shield tunneling in a water-rich sand layer to pass through an existing line and pass through a sewage pipe in a short distance, comprising the following steps:
[0041] S1) Before construction, use MIDAS GTS NX software and FLAC3D numerical simulation to optimize the tunneling plan and determine the unfavorable parts;
[0042] S2) Excavation in the test section, the 50m stratum before crossing is the test section; the test section adjusts and collects various construction parameters, and observes the monitoring situation;
[0043] S3) Shield tunneling construction, the shield tunneling construction process includes:
[0044] 1) Soil pressure control on the excavation face; in order to ensure ground subsidence, maintaining the stability of the excavation face is a prerequisite, and the stability of the excavation f...
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Abstract
The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for a water-rich sand layer shield to pass through an existing line and pass through a sewage pipe jacking at a short distance. Specifically include the following steps: S1) Use MIDAS GTS NX software and FLAC3D numerical simulation to optimize the excavation plan before construction, and determine the unfavorable parts of the force; S2) Excavation in the test section, passing through the 45m-60m stratum in the direction of the front shield as the test section; S3) Shield crossing construction, the shield tunneling construction process includes: 1) soil pressure control, 2) shield thrust control, 3) synchronous grouting, 4) tunnel internal pressure measures; 5) tunnel automatic monitoring. The invention provides a good reference for solving the difficult control problem of the construction of the shield machine passing through the risk point in the water-rich sand layer at a short distance, has remarkable economic and social benefits, and has a very good application prospect.
Description
technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for a water-rich sand layer shield to pass through an existing line and pass through a sewage pipe jacking at a short distance. Background technique [0002] With the development of society, along with the construction of a large number of urban subway tunnels and the continuous improvement of the rail transit network, problems such as the intersection of many tunnel lines will also continue to emerge, bringing a large number of tunnel crossing construction problems. Such tunnel crossing engineering problems may have adverse effects on the existing tunnel structure, thereby affecting the normal operation of the existing subway. When the shield machine passes through the pipeline, the settlement of the pipeline will be affected by the ground disturbance. If the pipeline is split, it will have an extremely bad impact on the safety of th...
Claims
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IPC IPC(8): E21D9/04E21D9/06E21D9/093E21D11/00E21D11/08E21D11/10C04B28/00
CPCC04B28/00E21D9/003E21D9/04E21D11/003E21D11/08E21D11/10E21D11/105E21D9/0609E21D9/093C04B18/08C04B14/06C04B14/104
Inventor 李刚柱王海东赵昕龙童朝宝李伟史邢凯魏朋佳薛磊吴磊孙伯乐杨森梁卿恺崔利豪
Owner CHINA RAILWAY NO 3 GRP CO LTD