Vertical shaft working surface artesian flow sand layer slurry protecting rotary spraying grouting process

Abstract

The invention relates to a tunneling and support method for a mine, in particular to a slurry protection, rotary spraying and slurry injection technology for a flowing sand layer of pressure-bearing water of a work surface of a vertical well. When high-pressure and rotary spraying slurry injection is applied to the construction of a sand pebble layer, in particular a flowing sand layer under the condition of the pressure-bearing water of a work surface, the flowing water amount in a drilling hole is high and the pressure is high to cause the injected cement slurry to be flushed away by water, thus, piles can not be formed by rotary spraying. No study on the rotary spraying technology under the condition of pressure-bearing water is reported at home and abroad. In the work surface of a vertical well under the condition of pressure-bearing water, the invention sequentially carries out hole formation in a single-hole mode, pile formation in a slurry protection and single-hole mode and hole sealing and slurry fixation, and the rotary spraying construction of the flowing sand layer under the condition of the pressure-bearing water of integrated pressure and slurry protection is realized. The invention uses the work surface as a main construction field, and has small area of additional occupied land, and the construction machine has simplicity and low energy consumption. The adopted main material is the slurry of the cement series, which has no toxin or harm, and the induration is firm and reliable. The invention can play a positive role in protecting the natural resource and the ecological environment.

Description

technical field [0001] The invention relates to a tunneling support method of a mine, in particular to a slurry-preserving rotary jet grouting process for a pressurized water-flow sand layer on a working face of a vertical shaft. Background technique [0002] Grouting technology refers to the use of pressure to inject curable grout into rock and soil pores or cracks in buildings through drilling to improve its physical and mechanical properties or achieve a specific purpose (such as water stop, fire extinguishing, and friction improvement, etc.) ) engineering application technology. This technology has been widely used in engineering fields including hydropower engineering, railway engineering, construction engineering, highway engineering, bridge foundation, mine construction, etc., and has successfully solved many key technical problems in geological disasters, engineering slope reinforcement and waterproofing, and has achieved Great results. At present, there are many r...

AI Technical Summary

Problems solved by technology

Confined water and quicksand layers generally have good water permeability. If no special process is adopted during the rotary spraying process, the water gushing out of the borehole will be large and the pressure will be high, which will cause the injected cement slurry to be washed away by the water, resulting in the failure of the rotary spraying to form a pile.

At present, there is no research on the jet spraying technology under the condition of confined water at home and abroad, so there is no successful domestic precedent for the jetting waterproof curtain project of the quicksand layer of the shaft working face under the condition of confined water

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