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以松散破碎煤层回采巷道为背景,借鉴岩土工程中的“土钉墙”地基支护机理,提出两帮深孔卸压注浆支护技术。理论分析表明:松软煤层巷道两帮极限平衡区范围较大,现有的锚杆锚索支护方式难以保证巷道的稳定。在煤巷两帮一定范围内注浆能够再造承载层,提高两帮煤体的强度。通过数值模拟对巷道围岩注浆前后的极限平衡区、位移量和应力分布进行对比分析表明,松软破碎煤体两帮深孔注浆可以再造承载层,有效地控制巷道变形,提高巷道的整体稳定性。
Taking the loosely divided coal seam mining roadway as the background, taking advantage of the “soil nailing wall” foundation supporting mechanism in geotechnical engineering, two deep hole relief grouting support technologies are proposed. The theoretical analysis shows that the limit equilibrium area of two sides of loose coal roadway is large, and the existing anchor bolt and anchor support method is difficult to ensure the stability of the roadway. Grouting in the coal gangue within a certain range can rebuild the bearing layer and improve the strength of the two coal bodies. By numerical simulation, the limit equilibrium zone, displacement and stress distribution of surrounding rock before and after grouting are compared and analyzed. It is shown that two groups of deep-hole grouting with soft and broken coal can rebuild the bearing layer, effectively control the deformation of the roadway and improve the overall roadway stability.