Shield method tunnel synchronous grouting slurry applied to compound stratum with upper soft part and lower hard part

A composite stratum and synchronous grouting technology, which is applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as increased construction costs, large surface settlement, and grout segregation, and achieves prevention of grout segregation, good grout consistency, and difficulty in segregation Effect

Active Publication Date: 2010-02-24
CHINA RAILWAY NO 2 ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the double-slurry has high early strength and good fluidity, it is prone to slurry segregation and pipe plugging during the construction process, which directly affects the solidification effect of the slurry in the formation and the construction progress, not only delaying the construction time, but also due to waste The discharge of slurry, fresh mixing, etc. increase the construction cost
Moreover, the synchronous grouting grout with this mix ratio is used for shield tunneling in the upper-soft and lower-hard composite stratum. The surface settlement range is 10-15mm, and the surface settlement is relatively large, so it is not suitable for shield tunneling in the upper-soft and lower-hard composite stratum.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In the slurries listed in this embodiment, the consumption of each raw material in the mortar is (unit: kg / m 3 ) is: cement 150, sand 720, fly ash 440, bentonite 37, water 470.

[0016] The proportioned slurry is used in the construction of a certain section of the Guangzhou Metro. The mileage range of the construction section is ZDK22+392.964~ZDK22+856.392, the left line is 474.928m long, and the right line is YDK22+202.194~YDK22+856.392. The length is 654.473m, the total length of the two lines is 1129.401m, and the distance between lines is 5.0-23.4m. The geology of this section is mainly composed of silty clay stratum, plastic residual soil and slightly weathered layer. While excavating the shield, the grout is poured into the outer gap of the segment ring at the end of the shield through the pressure delivery of the grouting pump, so as to fill the outer space of the segment ring, fix the position of the segment, reduce ground subsidence, and act as a ring. The p...

Embodiment 2

[0018] In the slurries listed in this embodiment, the consumption of each raw material in the mortar is (unit: kg / m 3 ) is: cement 147, sand 840, fly ash 486, bentonite 40, water 486.

[0019] The grout with this ratio is used in the construction of a tunnel in a certain section of Guangzhou Metro. The total length of the line is 2159.217m. When the shield is excavating in this section, the ground surface settlement is controlled within 7mm in the section without karst caves and using this synchronous grouting slurry mix ratio.

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PUM

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Abstract

The invention discloses shield method tunnel synchronous grouting slurry which belongs to the technical field of shield tunnel engineering. The shield method tunnel synchronous grouting slurry consists of mortar and water glass, wherein the weight ratio of the mortar to the water glass is 1:4, and the weigh ratio of various raw materials in the mortar of cement to sand to fly ash to swell soil towater is 1:4.8-5.71:2.93-3.31:0.25-0.27:3.13-3.30. The shield method tunnel synchronous grouting slurry has good consistency and insusceptible separation, can effectively prevent the phenomena of slurry separation and grouting pipe blockage, can timely and effectively fill a building gap between a digging surface and the periphery of a pipe piece and control the ground surface settlement within 5to 7mm.

Description

technical field [0001] The invention discloses a synchronous grouting slurry for a shield tunnel, in particular to a synchronous grouting slurry for a shield tunnel suitable for upper-soft and lower-hard composite formations, and belongs to the technical field of shield tunnel engineering. Background technique [0002] With the rapid development of the field of urban rail transit, the application of subway shield technology has been promoted. The excavation of the shield machine will inevitably disturb the stratum; at the same time, due to the construction gap between the excavation surface and the lining segment, the ground surface along the tunnel will have a certain settlement, especially for the composite stratum with soft top and hard bottom. It is more difficult to control the settlement and deformation of the land. If effective measures are not taken to control the surface settlement, once a large surface settlement occurs, there will be a great risk. Therefore, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26E21D11/10C04B14/06C04B18/08
CPCC04B2111/70C04B28/26C04B2111/00724C04B28/04Y02W30/91C04B14/06C04B14/104C04B18/08
Inventor 李林卿三惠陈强辜长军魏杰
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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