综采工作面水力压裂顶板控制技术研究
Research on control technology of hydraulic fracturing roof infully-mechanized mining face
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摘要: 为解决综采工作面基本顶难垮落且垮落步距大的问题，根据魏墙煤矿1307工作面地质条件，采用水力压裂技术进行水力压裂现场试验研究。探讨了工作面顶板垮落情况和初次来压步距，研究结果表明：压裂后，顶板围岩破碎度及裂隙发育明显扩大，压裂破坏了顶板围岩的完整性，有效弱化了顶板岩层；根据支架初撑力和工作阻力连续监测可以得出压裂后工作面基本顶初次垮落平均步距为44.5 m，与预裂爆破强制放顶相比，来压步距减少约8.0 m。水力压裂控制顶板技术具有工程量小，安全性高，施工速度快和控顶效果好等特点，能够有效解决综采工作面坚硬顶板基本顶初次垮落步距大、支架压力大等问题，实现矿井安全高效开采。Abstract: In order to solve the problem that the basic top of the fully mechanized mining face is difficult to fall and the step size is large, this paper used the hydraulic fracturing technology to carry out the hydraulic fracturing field test research according to the geological conditions of NO.1307 working face of the Weiqiang Coal Mine. This paper discussed the collapse of the top surface of the working face and the initial pressure step. The results showed that after fracture, the fracture degree and crack development of the surrounding rock of the roof were obviously expanded, and the fracturing destroyed the integrity of the surrounding rock of the roof and effectively weakened the roof rock. The continued monitoring of the powered support working resistance showed that after the fracturing operation, the primary falling span of the main roof in the coal mining face was 44.5 m and 8.0 m was reduced compared with the prefabricated blasting forced roof caving. The primary roof falling technology of the fully-mechanized top coal caving mining face with the hydraulic fracturing control would have a small engineering workload, high safety, fast construction speed, good roof control effect and other features and could effectively solve the long primary falling span of the main roof and the high powered support pressure of the fully mechanized top coal caving mining face with the hard roof. It can realize the effective and safe mining.
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