Shield excavation gap synchronous grouting slurry for water-rich powdery soil layer
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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
Active Publication Date: 2021-04-30
CHINA UNIV OF MINING & TECH (BEIJING) +1
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At present, the synchronous grouting slurry widely used in the construction of shield tunnels in China mainly includes ordinary single-liquid slurry and double-liquid slurry added with water glass. The ordinary single-liquid slurry is easy to segregate when exposed to water, and it is obviously suitable for water-rich formations. Poor; compared with single-liquid slurry, double-liquid slurry has the characteristics of shorter gelation time, slightly stronger waterproof performance, higher strength and durability, etc.
However, the above two typical grouts still have defects such as poor waterproof performance and insufficient filling strength, especially for water-rich silty clay and silty sandy soil formations, which have higher requirements for water-stopping effect and filling performance. Therefore, The synchronous grouting slurry for shield tunneling in the water-rich powder soil layer should have the effects of short setting time, high strength and obvious water-stop effect
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example 1
[0072] Example 1: Slurry ratio in the initial and receiving stages of shield tunneling (kg / m3)
[0074] B liquid - water glass solution, meet the volume ratio A liquid: B liquid = 10:1;
[0075] The initial setting time of the double slurry is 20-35s, the slump is not less than 23cm within 4 hours, the slump is not less than 18cm within 10 hours, and the fluidity is not less than 230mm within 8 hours.
example 2
[0076] Example 2: Slurry ratio of shield tunneling in silty clay section (kg / m3)
[0078] B liquid - water glass solution, meet the volume ratio A liquid: B liquid = 10:1;
[0079] The initial setting time of the double slurry is 15-25s, the initial slump is between 25±1cm, the slump is not less than 23cm within 4 hours, the slump is not less than 18cm within 10 hours, and the fluidity is not less than 8 hours 230mm.
example 3
[0080] Example 3: Slurry ratio in the silt section of shield tunneling (kg / m3)
[0082] B liquid - water glass solution, meet the volume ratio A liquid: B liquid = 10:1;
[0083] The initial setting time of the double slurry is 10-25s, the initial slump is between 25±1cm, the slump is not less than 24cm within 4 hours, the slump is not less than 19cm within 10 hours, and the fluidity is not less than 8 hours 230mm.
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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.
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...
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