Application of WSS construction method in shield tool changing reinforcement of water-rich sand layer

Abstract

Provides an application of WSS construction method in the reinforcement of shield tunneling in water-rich sand layer. The grouting process of WSS construction method adopts tunnel drilling rig to carry out deep hole grouting reinforcement. The slurry is used to drain the soil to improve the impermeability of the soil; when the whole solidification is completed by the solution-type slurry backward grouting composed of liquid A and liquid B, the suspension composed of liquid A and liquid C is used again. The forward grouting of the type slurry is used to consolidate the soil, change the physical properties of the original soil and improve the compressive strength of the soil, and finally make the weak soil layer (mainly sandy, gravel-cohesive soil and sand layer) impermeable. Soil with high resistance, high compressive strength and high stability is convenient for opening inspection and tool replacement.

Description

technical field [0001] The invention relates to the shield technology, in particular to the application of a WSS construction method in the tool change reinforcement of the water-rich sand layer shield. Background technique [0002] Traditional shield tool change reinforcement methods include stirring pile method, rotary spraying pile method, stirring + rotary spraying pile method, sleeve valve tube grouting method, manual hole digging pile method, etc. The more commonly used reinforcement methods include stirring pile method, rotary spraying pile method, etc. Spray pile method, mixing + rotary spray pile method. For water-rich sand layers, the most commonly used method is the jet jet pile method. [0003] The dual-method high-pressure rotary jetting is a mixed jetting method of air jetting and slurry pouring and agitation. That is to use a layer of injection pipes to inject air horizontally and cut the foundation soil, and use the upward force of the air to remove the bro...

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Problems solved by technology

[0012] 3. Judging from the current situation of shield tunneling on Shenzhen Metro Line 7, the use of high-pressure rotary grouting piles for reinforcement will cause a large amount of water and mud gushing, and the risk is relatively high

[0013] 4. The cost is high, the verticality deviation control of the pile driver is difficult, the water stop control between the piles is poor, and it is not suitable for the upper soft and lower hard strata

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