Micro-crack grouting plugging material and grouting technology in underground mine

Abstract

The invention discloses a grouting plugging material for micro-cracks in a mine and a grouting grouting process. The water-solid ratio of the sum of the two masses of cement is 0.8:1-4:1, the mass-lime-soil ratio of ultra-fine cement and bentonite is 1:1-1:3, and the amount of water glass added is 2%-10 of that of ultra-fine cement. %. The present invention has higher grouting water blocking rate for downhole micro-cracks and water-rich formations, good curing effect, good slurry fluidity, effectively solves the problem of micro-cracks filling effect, and satisfies and achieves design requirements.

Description

technical field [0001] The invention relates to the technical field of underground grouting in mines, in particular to a grouting plugging material for micro-cracks in underground mines and a grouting and grouting process. Background technique [0002] During the roadway excavation of fissures and flood mines, water gushing from micro-fissures or water-rich fracture zones is often encountered. These micro-fissures often communicate with large water-conducting channels. Small cracks, big water, no grout, difficult grouting" technical problems need to be solved from the grouting material, grouting process and hole layout method. For example, the main and auxiliary shafts of the Luohe Iron Mine in Magang pass through the secondary quartzite aquifer. Because the opening of the cracks is too small and contains mud, the cement grouting cannot solve the problem at all, resulting in a delay of more than two years in the construction period; the vertical shaft of the Mabianshan Iron ...

AI Technical Summary

Problems solved by technology

However, for micro-crack grouting, the existing grouting materials have the following problems: (1) The traditional portland cement grouting materials have the advantages of high strength, good durability, abundant material sources, simple process equipment, Low cost and other advantages, it is widely used, but the particle size of ordinary cement is relatively large, generally 10um to 80um, and cannot be injected into micro-cracks smaller than 0.2mm, so the application effect is limited

(2) Chemical grout has low viscosity and good injectability, which can make up for the weakness of ordinary cement and can meet the needs of pumping into tiny cracks during grouting; however, chemical grouting materials are expensive and have different degrees of pollution problems

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