Cyclic induction curtain grouting method for inclined shaft to penetrate through water-enriched compact quicksand stratum

Abstract

The invention discloses a cyclic induction curtain grouting method for an inclined shaft to penetrate through a water-enriched compact quicksand stratum. The method comprises the following steps that before a driving face of the inclined shaft enters the quicksand stratum, a large-diameter orifice pipe with a hole valve is hit into a forward stratum along the outer driving contour line of the inclined shaft; drilled holes with certain depths are constructed in the orifice pipe, and the drilled holes comprise grouting holes and induction holes which are formed at intervals according to a linear mode or a triangular mode or a plum blossom mode; and grouting construction is conducted on the grouting holes. According to the grouting method, water and gas with pressure exceeding the pore water pressure can be discharged in time according to pressure relief areas, formed between the adjacent drilled holes, of the induction holes, the grouting slurry seepage resistance or splitting diffusion resistance in the quicksand stratum is reduced, the number of pores or fracture channels, between the drilled holes, of the quicksand stratum is increased, and the groutability of the quicksand stratum is improved; and hole cleaning and drilling are conducted in the orifice pipe, and sleeves are used for protecting the holes, so that the hole collapse problem of the drilled holes in the quicksand stratum is solved, the cyclic advancing type grouting technique is achieved, and the effect that the inclined shaft efficiently and safely penetrates through the water-enriched quicksand stratum is guaranteed.

Description

technical field [0001] The invention relates to the field of mine roadway excavation, support and reinforcement engineering, in particular to a curtain grouting method for circular induction of an inclined shaft passing through a water-rich and dense quicksand layer. Background technique [0002] The quicksand layer is characterized by its fluidity under water content and pressure or dynamic disturbance. When the quicksand layer is disturbed by excavation, the quicksand will flow to the empty surface to fill the excavated space, and even cause large-scale surface subsidence. Therefore, the technical difficulty of crossing quicksand layers such as mine roadways, inclined shafts or tunnels is greater than that of general formations. [0003] Quicksand is in a loose state, and it is generally difficult to provide reliable anchoring force. Active support forms such as anchor rods and anchor cables have poor control effects on the flowing sand layer. At the same time, the stabil...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: The purpose of the invention is to provide a method to ensure the high efficiency and Grouting method for safely crossing water-rich quicksand formation

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