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
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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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