A Grouting Method for Eliminating Grouting Blind Area in Soft Stratum

Abstract

The invention discloses a grouting method for eliminating grouting blind areas in soft stratum. The grouting method comprises the steps that grouting holes are arranged according to construction grouting design parameters, and one of the grouting holes is randomly selected as a grouting test hole; a grouting test is carried out on the grouting test hole to test grouting quantity and stratum splitting grouting pressure; controlling grouting is carried out in the other grouting holes; when all the grouting holes are grouted, and an inspection hole water pressure test and quality inspection are carried out; and compensation grouting is carried out on inspection holes which do not meet the design requirements. According to the grouting method for eliminating the grouting blind areas of the soft stratum, firstly, the stratum is tightly compacted through a compaction-splitting composite grouting method, and the diffusion radius of cement-based slurry vein is increased, and the existence of the grouting blind areas is reduced; then, blind area compensation grouting is carried out between holes which do not meet the design requirements, and the grouting blind areas are filled in a permeating mode by using the good groutability of chemical grouting materials and biological grouting materials, thus a closed grouting curtain is formed, and the best grouting effect is achieved.

Description

technical field [0001] The invention relates to the fields of water conservancy engineering and foundation treatment engineering, in particular to a grouting method for eliminating blind areas of grouting in soft strata. Background technique [0002] Engineering practice has found that the cement-based grout is affected by the filter press effect and solidification shrinkage during the diffusion process of the soft ground, and is not filled with grouting materials between the grout veins and the compacted rock and soil mass and within the compacted body. One area is called the grout dead zone. The existence of this area not only makes it difficult for grouting to form a closed anti-seepage curtain, but also easily forms leakage channels or weak surfaces under the action of osmotic water pressure or other external loads, especially the groutability and looseness of dense and soft strata. Poor controllability, the problem of grouting blind spots is the most prominent. Howeve...

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Problems solved by technology

However, at present, most of the grouting in the soft ground adopts the compaction or split grouting method, wherein the compaction grouting forms grout bubbles near the grouting mouth, thereby compacting the soil outside the grout bubbles to achieve the purpose of anti-seepage reinforcement, although the grout bubbles The outer soil is compacted, and there are still small pores in this area that can seep water, which is also a grouting blind area; the split grouting method is to use a large grouting pressure in the grouting to make the grout hydraulically split in the soil, so that the soil The body splits a diffusion channel to increase the diffusion radius of the grout. Although this method increases the diffusion radius, the grout only fills the split diffusion channel, and there is still a grouting blind area in the unsplit area.

It can be seen that there has been no good solution and treatment plan for the grouting blind area. Therefore, eliminating the grouting blind area, forming a closed anti-seepage grouting curtain and improving the grouting quality are major problems to be solved urgently by technicians in this engineering field.

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