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Slurry suitable for back filled grouting of low-strength stratum shield segments

A technology of shield segment and back wall grouting, which is applied in mining equipment, tunnels, earthwork drilling, etc., can solve problems such as poor fluidity and long gelling time, and achieve good durability, improved effect, and expanded scope. Effect

Inactive Publication Date: 2017-09-05
THE FIRST ENG CO LTD OF CTCE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grouting fluid in the prior art has poor fluidity and long gelation time

Method used

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Comparison scheme
Effect test

Embodiment Construction

[0015] The purpose of the present invention is to grout behind the shield segment wall of the low-strength red layer formation, fill the strata as soon as possible after the shield machine excavates, reduce the subsidence of the foundation, and ensure the safety of the surrounding environment; ensure the early stability of the segment lining As the first line of defense for lining waterproofing, it provides long-term, homogeneous, and stable waterproofing functions; as a reinforcement layer for tunnel lining structures, it has durability and certain strength.

[0016] The general requirements for synchronous grouting are:

[0017] 1. Gelation time: generally 3 to 10 hours. According to the formation conditions and the speed of excavation, the gelation time is adjusted by adding coagulant and changing the proportion through field test. For highly permeable formations and areas that require grouting to provide high early strength, the ratio can be further adjusted and early str...

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Abstract

The invention discloses slurry suitable for back filled grouting of low-strength stratum shield segments, and belongs to the field of grouting materials. The slurry is prepared from synchronous grouting slurry and secondary grouting slurry, wherein a mix proportion (mass ratio) of the synchronous grouting slurry is cement to sand to water to coal ash to bentonite equal to 160 to 830 to 450 to 400 to 50, and a mix proportion (mass ratio) of the secondary grouting slurry is cement to water to sodium silicate equal to 445 to 356 to 685. The synchronous grouting slurry disclosed by the invention has the characteristics of high stone rate, high stone body strength, good durability and the like, and invalid grouting caused by flushing and leaching of underground water in the synchronous grouting is avoided. The secondary grouting slurry disclosed by the invention overcomes the defects of long coagulation time of single-liquid cement slurry, difficulty in controlling, low stone rate under a flowing water condition and the like, a cement grouting effect is improved, a range of cement grouting is expanded, and the waste situation caused by a poor grouting effect of ordinary cement slurry and multiple grouting is avoided.

Description

technical field [0001] The invention relates to a grouting material, in particular to a grout suitable for post-grouting of the segment wall of a low-strength formation shield. Background technique [0002] After the shield machine is advanced, due to the abundant groundwater resources, there is a large gap between the segment and the cave body. If the filling is not timely, the stress of the formation will be released, resulting in deformation of the cave body. The result is ground subsidence, settlement, deformation or damage of adjacent buildings (structures). In order to ensure the safe and smooth construction of the shield machine in the low-strength red bed stratum, synchronous grouting and secondary grouting were implemented in the construction of the shield method to solve the problem that the low-strength red bed stratum is easily softened by water . The main purpose of grouting is to prevent formation deformation. Secondly, it can also suppress the relaxation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B28/04E21D9/06E21D9/10C04B111/70
CPCC04B28/02C04B28/04C04B2111/00724C04B2111/70E21D9/0607E21D9/10C04B14/06C04B18/08C04B14/104C04B12/04
Inventor 李东任李缪璇赵自静胡柱奎王瑛
Owner THE FIRST ENG CO LTD OF CTCE GRP
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