Shield excavation gap synchronous grouting slurry for water-rich powdery soil layer

A technology of synchronous grouting and formation, applied in the field of shield tunnel construction, can solve the problems of insufficient filling strength, short setting time, high strength, etc., and achieve improved compactness and waterproof effect, reasonable component distribution ratio, and high impermeability Effect
CN112723836AActive Publication Date: 2021-04-30CHINA UNIV OF MINING & TECH (BEIJING) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH (BEIJING)
Publication Date
2021-04-30

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Abstract

The invention relates to a shield excavation gap synchronous grouting slurry for a water-rich powdery soil layer, the synchronous grouting slurry is a double-liquid slurry formed by mixing and stirring a liquid A and a liquid B. The liquid A comprises the following concrete components in terms of per cubic meter: 100 to 200 kg of cement; 400 to 600 kg of fly ash; 40 to 80 kg of bentonite; 600 to 800 kg of sand; 20 to 70 kg of lime; 400 to 550 kg of water; 6-9 kg of a water reducing agent; and 10 to 20 kg of KFA (potassium fluosilicate); wherein the solution B is a water glass solution, and the volume ratio of water glass to water is (3-4): 1; the liquid A and the liquid B are mixed and stirred according to the volume ratio of 10: 1. The synchronous grouting slurry disclosed by the invention can be widely applied to a powdery soil layer and is not limited to a pure sandy cobble layer and a pure clay layer, and double slurries can be gelled in an extremely short time, so a reinforcing effect of filling and solidifying is rapidly achieved.
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Description

technical field

[0001] The invention relates to the field of shield tunnel construction, in particular to a synchronous grouting slurry used for shield tunnel excavation gaps in water-rich powder soil layers. Background technique

[0002] In order to realize the smooth turning of the shield body and prevent the shield shell from being stuck during the excavation process of the shield, the difference in the outer diameter of the cutterhead-shield body-segment will produce a certain excavation gap. The filling of the excavation gap while shield tunneling is called synchronous grouting. Different ratios of synchronous grouting grout will change the properties of the grout, which will affect the disturbance of the formation and cause unfavorable surface settlement.

[0003] The synchronous grouting slurry should have certain filling performance, suitable initial setting time and good fluidity, while the synchronous grouting slurry in the water-rich formation should also have str...

Claims

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