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Determining the Influence of Land Subsidence on Subway Tunnel Subsidence and the Method of Protecting Tunnel Structure

A technology for tunnel settlement and ground settlement, which is applied in tunnels, earthwork drilling, special data processing applications, etc. It can solve the problems of complicated installation process, inability to monitor the subsidence of the ground below the tunnel, and high cost

Inactive Publication Date: 2017-05-10
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the complicated installation process and high cost of layered settlement marks, there are only a few distributed in cities and most of them are far away from subway tunnels
Therefore, the layered settlement monitoring technology cannot be used for the monitoring of the ground settlement below the tunnel.

Method used

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  • Determining the Influence of Land Subsidence on Subway Tunnel Subsidence and the Method of Protecting Tunnel Structure
  • Determining the Influence of Land Subsidence on Subway Tunnel Subsidence and the Method of Protecting Tunnel Structure
  • Determining the Influence of Land Subsidence on Subway Tunnel Subsidence and the Method of Protecting Tunnel Structure

Examples

Experimental program
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Effect test

Embodiment

[0054] A Shanghai subway line includes 11 sections and 12 stations. Since its operation, significant settlement has occurred due to ground subsidence, tunnel excavation, train dynamic load, tunnel seepage water, and disturbance of adjacent engineering construction.

[0055] The first step is to clarify the structural design information of each station along the subway tunnel, obtain the soil layer division information of the station site by drilling soil, and use the collected soil samples to conduct indoor density tests and high-pressure consolidation tests to determine the soil volume of each layer of soil. characteristic.

[0056] Taking the first station as an example, the ground elevation of the site is 4.2m, and the soil layer distribution from top to bottom obtained through drilling is as follows: the first layer (4.2m~-0.4m) is silty clay; the second layer ( -0.4m~-4.8m) is muddy silty clay; the third layer (-4.8m~-12.8m) is muddy clay; the fourth layer (-12.8m~-30.8m)...

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Abstract

The invention provides a method for determining influences of land subsidence on subway tunnel settlement and protecting a tunnel structure. Settling amount of a subway tunnel and settling amount of a station are determined through leveling, the settling amount of the station serves as a data point, a settling amount curve, caused by area land subsidence, along the subway tunnel is determined through cubic spline interpolation fitting, and accordingly the influences of land subsidence on subway tunnel subsidence are determined, and reasons of greatly influenced area land subsidence are investigated and controlled so that the aim of protecting the tunnel structure can be achieved. An interpolation fitting method with the subway station settling amount as the data point is adopted, the influences of land subsidence on subway tunnel settlement are determined, the defects that installation is complex and expenses are high when layered subsidence monitoring is adopted are made up for, and bases are provided for tunnel structure protection. The method is applicable to the tunnel deformation control problem caused by land subsidence.

Description

technical field [0001] This invention relates to a technical method in the technical field of construction engineering, specifically a method for determining the influence of ground subsidence on subway tunnel subsidence and protecting the tunnel structure. Background technique [0002] Subway tunnels in coastal soft soil strata in my country are usually constructed using the shield method, and the lining is made of segments spliced ​​together. Due to the high sensitivity and high compressibility of coastal soft soil, the tunnel is prone to tunnel settlement and longitudinal deformation during long-term use, resulting in water leakage in the tunnel, cracks in the lining, and distortion of the track. In severe cases, it even threatens driving safety. Shen et al. published "Long-term settlement behavior of the metro tunnel in the soft deposits of Shanghai" (Long-term settlement behavior of the metro tunnel in the soft deposits of Shanghai) in "Tunnelling and Underground Space ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/14G06F19/00
CPCE21D9/14
Inventor 沈水龙吴怀娜任栋杰袁垚
Owner SHANGHAI JIAOTONG UNIV