Coal mine tunnel broken surrounding rock layering grouting technology and method

Abstract

The invention discloses a coal mine tunnel broken surrounding rock layering grouting technology and method. Novel double-fluid inorganic grouting materials are adopted, and the method is matched with a novel grouting hole sealing device to achieve drilling layering grouting. The method comprises the steps that grouting drilling is constructed at first, the dual-layer grouting hole sealing device is adopted for hole sealing, then, grouting materials with the low water cement ratio, high viscosity and high condensation speed are adopted to be used in cooperation with the low-pressure and low-flow grouting technology, an outer layer grouting pipe is utilized for conducting grouting on a surrounding rock shallow layer broken zone to form an effective grouting stopping layer, then, the water cement ratio of the grouting materials is improved gradually, the material permeability characteristics are improved, the material curing time is prolonged, the grouting pressure is gradually improved, and an inner layer grouting pipe is utilized for completing surrounding rock deep layer grouting. The method adapts to surrounding rock failure and permeability characteristic zoned characteristics, the grout leakage problem is effectively solved, and layering grouting in the same drilled hole is achieved.

Description

technical field [0001] The invention relates to a layered grouting process and method for broken surrounding rocks in a coal mine roadway, and has certain adaptability to grouting reinforcement of tunnels, foundation pits, side slopes and other engineering projects. Background technique [0002] The grouting reinforcement of the broken surrounding rock in coal mine roadway has become one of the effective technical measures to control the deformation of the surrounding rock and prevent the side and roof fall accidents. However, the current ordinary cement or polymer grouting materials cannot adapt to the partition of the surrounding rock damage and permeability characteristics. Features: Ordinary cement grouting materials have problems such as serious grout leakage in shallow layers, poor injectability in deep layers, and long curing time. Polymer grouting materials have shortcomings such as fixed performance parameters, high cost, and toxicity and corrosion. Some mines use s...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to aim at the serious grout leakage in the shallow layer, poor injectability in the deep layer, inconsistency of grouting materials in the shallow layer and deep layer, inability to unify the grouting holes in the shallow layer and deep layer, etc. To solve technical problems, provide a layered grouting process and method, which is more suitable for the fragmentation degree and permeability characteristics of the surrounding rock.

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