Drifting sand layer and gravel stratum water-moving double-liquid high pressure slip-casting water-blocking construction method

Abstract

The present invention discloses a running sand layer and sandy gravel layer dynamic-water double-liquid high-pressure slurry-injecting water-shutoff construction method which comprises the following construction steps: drilling a hole, flushing the hole, executing double-liquid high-pressure slurry-injecting operation and sealing the hole. The running sand layer and sandy gravel layer slurry-injecting liquid adopts an ordinary portland cement (P.O.42.5) and 40''Be sodium silicate as material for preparing the slurry, according to the weight proportion of water: cement, namely the cement slurry is prepared with the water cement ratio for 0.5-1.2:1. Then the slurry-injecting liquid is prepared with the volume ratio of cement slurry: sodium silicate for 1:0.08-0.15. The sodium silicate is taken as additive for regulating the initial setting time of the slurry-injecting liquid. The cement slurry can also be doped with fly-ash with cement consumption (weight proportion) for 10%-15%. The invention executes water-insulating construction aiming at the characteristics of large pressure of the underground dynamic water and high flowing velocity in the running sand layer and sandy gravel layer, and can obtain the maximal application sphere and optimum water-shutoff effect.

Description

technical field [0001] The invention relates to the field of geotechnical engineering in the discipline of civil engineering, in particular to the water blocking construction technology for deep foundation pit curtain water stop, water conservancy project danger relief and reinforcement, mine roadway strong water-bearing formation water inrush, and the like. Background technique [0002] At present, the water blocking technology in the sand layer and gravel layer containing high-pressure dynamic water flow is a major problem in the construction of foundation pit curtain water stop, manual excavation pile hole formation and tunnel excavation. Engineering disasters such as water gushing and sand gushing. At present, precipitation and grouting are mainly used in the water plugging construction of high-pressure dynamic water-bearing flowing sand layers and gravel layers at home and abroad. Among them, precipitation is likely to cause water loss in the stratum, settlement of the ...

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Problems solved by technology

[0005] The single-liquid grouting method is simple and effective, but the cement grout takes a long time to solidify, and the grout is easily diluted in strong water-bearing formations. For sandy gravel foundations, karst caves, faults, weak interlayers and other geological conditions with strong water permeability and large water inflow For grouting projects whose main purpose is to block water, single-liquid grouting is difficult to achieve the desired effect

[0006] The process of double-liquid high-pressure grouting has no standards for reference so far. It can be seen from relevant materials and engineering practice that due to the lack of double-liquid grouting standards and deviations in its understanding of grouting, the current construction methods are different. The equipment is different from the hole-forming machine tools. There are various forms such as double-pump single-pipe, double-pump double-pipe, single-pump double-pipe, single-pump single-pipe, etc. The parameters such as grouting pressure and the ratio of grout are even more varied. In actual engineering Difficult to meet design requirements

[0007] In the saturated dynamic high-pressure water-bearing sand layer and gravel layer, the dynamic water pressure of the groundwater is high, the flow velocity is high, and the water flow is large. The two-liquid grouting of the existing technology cannot achieve the grouting purpose, and the reliability of the grouting effect is relatively low. It cannot meet the engineering needs under various complex conditions

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