Abstract
Drift-sand layer is a common weak stratum in mine construction. The construction of the shaft passing over the drift-sand layer is very difficult. Traditional construction method faces many problems such as long construction period, high construction cost, poor working environment, and uncontrollability of the support effect. In view of the loose and fragile rock mass with great deformation of sinking and driving engineering penetrating drift-sand layers in coal mine, the reaction mechanism and shortcomings of conventional chemical grouting materials were analyzed. New-type polymer grouting materials were prepared with catalysts and vinyl epoxy resin, which was made from epoxy resin. A comprehensive chemical grouting construction technology was proposed, which comprises initiative closing, concentrated bypass flow, water plugging priority, and secondary sand curing for the inclined shaft passing over the drift-sand layer. Results show that new-type polymer sand-cured materials have lower viscosity, better grout ability, and fire resistance, and the solidified material has stronger bonding strength and better deformation resistance compared with traditional chemical grouting materials. The engineering application effect is very prominent in controlling water burst and leakage at the drift-sand layer; thus the on-site comprehensive construction progress and safety are guaranteed.
Highlights
With the increasing depth of underground coal mine and the deterioration of engineering geologic environment, weak or harmful strata are frequently encountered and result in roof collapse, caving and deformation of permanent supports, presenting great difficulty for mine construction [1, 2]
The chemical grouting materials with lower viscosity, better liquidity and grout ability into microfissures, and adjustable range of curing time have been widely applied to the management of underground coal mine water bursts. e chemical grouting materials such as polyurethanes, urea resin, and epoxy resin are used commonly in grouting reinforcement projects. e polyurethane grouting materials have been widely applied because of their volume expansion and plastic deformation when curing
Aiming at the special geologic conditions of sinking and driving engineering passing through the drift-sand layer, the polymer two-component chemical grouting materials and pregrouting construction technology, which have the functions of both water plugging and consolidation were put forward. us, the water burst passing over the drift-sand layer under complicated conditions was effectively controlled, and the shaft construction progress and safety were ensured
Summary
With the increasing depth of underground coal mine and the deterioration of engineering geologic environment, weak or harmful strata (i.e., water burst, drift sand, and sludge) are frequently encountered and result in roof collapse, caving and deformation of permanent supports, presenting great difficulty for mine construction [1, 2]. E polyurethane grouting materials have been widely applied because of their volume expansion and plastic deformation when curing These materials have obvious defects, such as higher viscosity, weaker fire resistance, and Advances in Materials Science and Engineering strength reduction, caused by foaming and reacting with water. Conventional chemical grouting reinforcement materials have defects such as toxicity, high viscosity, weak grout ability, lower strength, and poor anticorrosion and fire resistance, and these defects restrict the large-scale engineering application. Aiming at the special geologic conditions of sinking and driving engineering passing through the drift-sand layer, the polymer two-component chemical grouting materials and pregrouting construction technology, which have the functions of both water plugging and consolidation were put forward. Aiming at the special geologic conditions of sinking and driving engineering passing through the drift-sand layer, the polymer two-component chemical grouting materials and pregrouting construction technology, which have the functions of both water plugging and consolidation were put forward. us, the water burst passing over the drift-sand layer under complicated conditions was effectively controlled, and the shaft construction progress and safety were ensured
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