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Dual-liquid micro-disturbance grouting strengthening method for soft-soil subway tunnel

A grouting reinforcement and micro-disturbance technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as easy water loss and plugging, difficult to use split grouting reinforcement methods, and difficult to control the development of settlement

Active Publication Date: 2014-12-03
SHANGHAI SHENTONG METRO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of two-liquid micro-disturbance grouting reinforcement method for soft soil subway tunnel, described this double-liquid micro-disturbance grouting reinforcement method for soft soil subway tunnel will solve the problems in the prior art The split grouting reinforcement method is difficult to apply to soft cohesive soil layers, the compaction grouting method is difficult to control the development of settlement and the technical problems of easy water loss and pipe plugging

Method used

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  • Dual-liquid micro-disturbance grouting strengthening method for soft-soil subway tunnel

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Effect test

Embodiment 1

[0024] The southern section of Rail Transit Line 11 crosses Rail Transit Line 1 in a certain section of Rail Transit Line 1. The minimum clear distance between the two is 7.48m. The resulting soil loss led to uneven settlement of Line 1. The longitudinal length of the settlement section was about 100m, the maximum settlement of the upward line was 12mm, and the maximum settlement of the downward line was 10mm, and it also had a tendency to continue to sink. In order to prevent the further settlement of Line 1 from causing greater differential settlement and affecting the safety of the subway structure, the method of the present invention is used to reinforce the disturbed soil layer under Line 1, and the subsidence section is lifted up by grouting to achieve The dual purposes of soil reinforcement and alignment adjustment in the differential settlement section.

[0025] In the reinforcement process of this embodiment, grouting reinforcement is first performed on the section wi...

Embodiment 2

[0029] A certain tunnel in Rail Transit Line 2 was found to have a large differential settlement. Among them, the local settlement of the uplink tunnel at the position about 100 rings away from the entrance and the downlink tunnel at a certain pumping station was relatively large, with an average settlement rate of about 0.3-0.4mm / d , and developed to 43.2mm and 50.7mm, resulting in a relatively large local slope of about 0.16% near the entrance and the pumping station, which poses a threat to the train operation and the safety of the tunnel structure. Water leakage occurs in many places in the tunnel, and its pumps Serious disengagement of the ballast bed and segments occurred at the position of maximum settlement of the station.

[0030]Combining the settlement curve of the tunnel up and down the tunnel and the condition of the soil layer where the tunnel is located, it can be known that the settlement of the tunnel up and down the tunnel is basically the same from the east o...

Embodiment 3

[0046] The shield tunneling construction of Rail Transit Line 11 passes Rail Transit Line 2 under a certain section of Rail Transit Line 2. The minimum clear distance between the two is 1.65m. The loss caused uneven settlement on Line 2, with the maximum settlement of the uplink reaching 16mm and the maximum settlement of the downlink reaching 22mm, and there is a tendency to continue to sink. In order to prevent the further settlement of Line 2 from causing greater differential settlement and affecting the safety of the subway structure, the present invention is used to strengthen the disturbed soil layer under Line 2 with double-fluid micro-disturbance grouting, and through the grouting, the upper part of the settlement section To achieve the dual purpose of soil reinforcement and alignment adjustment for differential settlement sections.

[0047] In this embodiment, grouting reinforcement is first performed on the section with a settlement greater than 6mm, with 35 rings in...

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Abstract

A dual-liquid micro-disturbance grouting strengthening method for a soft-soil subway tunnel includes the step of grouting grout into soil. The grout is mixed by cement slurry and soluble glass, and the volume ratio between the cement slurry and the soluble glass is 2.5:1-3.0:1. The grout is grouted according to a principle of evenness, small amount, multiple points and multiple times, and each single grouting length ranges from 8.8 centimeters to 35.2 centimeters. Meanwhile, the tunnel sedimentation condition is monitored. Each single grouting process is completed via an order of stirring grout, installing a blowout preventer, pressing tubes, grouting, unplugging tube and closing a ball valve. As prediction of tunnel sunk or ridged deformations and field grouting control are integrated, the tunnel can be protected from deforming, the problem about strengthening of the substratum soil of the soft-soil subway tunnel can be solved, and the normal operating of the tunnel cannot be influenced. The dual-liquid micro-disturbance grouting strengthening method for the soft-soil subway tunnel can be widely applied to control of tunnel deformations and grouting of constructions of side-channels, pump stations, end wells and crosses during new line construction and transfer process.

Description

Technical field: [0001] The invention relates to the construction field, in particular to an underground engineering foundation reinforcement technology, in particular to a double-liquid micro-disturbance grouting reinforcement method for soft ground subway tunnels. Background technique: [0002] The subway operation tunnel will undergo longitudinal deformation to different degrees in some sections with the time of use, which will cause the separation of the ballast bed and the segment, and water leakage in the tunnel. The factors that cause the longitudinal deformation of the tunnel are more complicated, including during the tunnel construction period, after the subway operation, the system itself, and changes in the surrounding environment, mainly manifested in (1) poor consideration during the construction period or shield tunneling Potential hidden dangers reserved during the advancement process; (2) Defects such as differential settlement of tunnels caused by long-term ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10
Inventor 王如路董秦海张帆李家平邵华汪小兵
Owner SHANGHAI SHENTONG METRO
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