Preparation method of synchronous grouting slurry for shield construction of water-rich sand layer

Abstract

The invention discloses a preparation method of synchronous grouting slurry for shield construction of a water-rich sand layer. The synchronous grouting slurry comprises 200-300 parts of cement, 100-200 parts of fly ash, 50-100 parts of bentonite, 250-350 parts of clear water, 600-800 parts of first fine sand, 600-800 parts of second fine sand and 8-16 parts of an additive, and all the componentsare mixed according to a certain proportion, the method comprises the following steps: S1, respectively screening cement, fly ash, bentonite, first fine sand, second fine sand and an additive for multiple times to remove stones and caked materials in the cement, the fly ash, the bentonite, the first fine sand, the second fine sand and the additive, wherein the number of times of screening for multiple times is not less than two, and S2, pouring 200-300 parts of cement into a stirring tank, pouring 600-800 parts of second fine sand into the stirring tank, and then adding 100-150 parts of clearwater. According to the invention, stirring is carried out for multiple times, and the component proportion is reasonable, so that the slurry is better in fluidity and faster in coagulation, the safety of workers is ensured, and the engineering quality is improved.

Description

technical field [0001] The invention relates to the technical field of sand layer shield construction, in particular to a method for preparing synchronous grouting grout for water-rich sand layer shield construction. Background technique [0002] During shield construction, due to the gap between the excavation diameter of the cutterhead and the outer diameter of the shield segment, and the influence of factors such as geological conditions, groundwater, tunnel depth, and excavation mode, it is easy to cause formation deformation and segment mislocation , Tunnel leakage and other adverse phenomena, so it is necessary to choose a reasonable grouting material to fill the gap behind the segment. [0003] With the excavation of the shield machine, when the segment leaves the tail of the shield, the stratum at this part appears a temporary unsupported volley state, causing the gap on the back of the segment to deform or partially collapse, and the ground subsides as the loose sur...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, when the water-rich sand layer is constructed by shield tunneling, due to the large proportion of water in the sand layer, the gap deformation or local collapse on the back of the segment is more likely to occur, which is more dangerous and has a greater common grout is not targeted enough, so we propose a method for preparing synchronous grouting grout for shield tunneling construction in water-rich sand layer to solve the above problems