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Filling settlement control material for shield construction

A shield and quality technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of easy plugging, high coagulation strength, fast coagulation speed of double liquid slurry, etc., to ensure the filling effect , wide applicability

Active Publication Date: 2022-05-13
TIANJIN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the existing grouting types, single-fluid grout has disadvantages such as easy loss and slow coagulation speed, and double-fluid grout has shortcomings such as fast coagulation speed, high coagulation strength, easy to lock the shield body, and easy to block pipes, etc., which cannot be solved well. above question

Method used

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  • Filling settlement control material for shield construction
  • Filling settlement control material for shield construction
  • Filling settlement control material for shield construction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: bentonite and kaolin (mass ratio of the two, bentonite: kaolin = 3:1) accounted for 27.6%, retarder accounted for 3.0%, waterproof agent accounted for 3.0%, fly ash accounted for 2.5%, Cement accounts for 3.8%, thickener (its mass ratio is CMC:PAM=1:1) accounts for 0.08%, and the balance is water. The volume ratio of liquid A to liquid B is 8:1.

[0056] The viscosity of the paste is 554dpa.s, the water retention rate is 91.2%, and the shear strength of the cross plate is 1.4kPa.

Embodiment 2

[0057] Example 2: bentonite and kaolin (mass ratio of the two, bentonite: kaolin = 3:1) accounted for 26.0%, retarder accounted for 3.1%, waterproof agent accounted for 3.1%, fly ash accounted for 2.6%, Cement accounts for 2.6%, thickener (the mass ratio of its composition is CMC:PAM=1:1.1) accounts for 0.05%, and the balance is water. The volume ratio of liquid A to liquid B is 8:1.

[0058] The viscosity of the paste is 331dpa.s, the water retention rate is 88.2%, and the shear strength of the cross plate is 1.1kPa.

Embodiment 3

[0059] Example 3: bentonite and kaolin (mass ratio of the two, bentonite: kaolin = 4:1) accounted for 26.3%, retarder accounted for 3.0%, waterproof agent accounted for 3.0%, fly ash accounted for 2.5%, Cement accounts for 4.3%, thickener (the mass ratio of its composition is CMC:PAM=1:0.9) accounts for 0.08%, and the balance is water. The volume ratio of liquid A to liquid B is 8:1.

[0060] The viscosity of the paste is 527dpa.s, the water retention rate is 89.4%, and the shear strength of the cross plate is 1.5kPa.

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Abstract

The invention discloses a filling subsidence control material for shield construction. The filling subsidence control material is mainly used for filling gaps outside a shield tunneling machine caused by overexcavation of a cutter head of the shield tunneling machine. The material is formed by mixing a solution A and a solution B. The solution A takes bentonite and kaolin as main agents, takes a thickening agent, a retarder, a waterproof agent, fly ash and cement as additives, and has the balance of water. And the solution B is water glass. The liquid A and the liquid B are mixed according to the volume ratio of (4: 1)-(10: 1). Compared with an existing filling sedimentation control material, the filling sedimentation control material disclosed by the invention focuses on strengthening the sedimentation resistance of the material, and has good performance on indexes such as the sedimentation resistance, the pumpability and the water-retaining property by utilizing a proper additive and a proper ratio.

Description

technical field [0001] The invention relates to the field of shield construction materials, in particular to a novel filling and settlement control material for shield construction. Background technique [0002] As the pace of my country's urban modernization is accelerating day by day, all kinds of rail transit have been greatly developed. The shield method is a kind of underground excavation method, and it is an important construction method for the development of underground rail transit in my country. However, the construction of the shield method will lead to inevitable settlement of the surrounding soil. Among them, the gap between the shield shell and the soil caused by the over-excavation of the cutterhead is an aspect that cannot be ignored. This gap will cause the surrounding strata and even buildings to A certain degree of deformation occurs. Especially for shield crossing projects, the requirements for deformation control of the buildings to be crossed are more...

Claims

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Application Information

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IPC IPC(8): C04B28/26C04B111/70
CPCC04B28/26C04B2111/70C04B2111/00732C04B2201/50C04B14/104C04B14/106C04B2103/44C04B2103/22C04B2103/65C04B18/08C04B7/02C04B22/002Y02W30/91
Inventor 郑刚答治华吴薪柳张春雷程雪松杜志田索晓明董秀竹赵林嵩林森斌林家桢
Owner TIANJIN UNIV