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为分析覆岩多层薄采空区坚硬顶板条件下特厚煤层工作面的强矿压显现机理,合理确定工作面支架支护阻力,采用理论分析、相似模拟与现场实践相结合的研究方法,对特厚煤层开采条件下的多层顶板破断规律与工作面支架阻力确定问题进行了探讨,得出了工作面支架阻力确定原则与方法。研究表明:多层坚硬顶板的破断形式与破断次序对工作面矿压显现影响较为明显;关键层顶板的单层垮断或多层同步失稳将对应不同的工作面支架阻力;坚硬厚层顶板同步失稳条件下,单纯提高支架阻力将难以满足特厚煤层工作面合理支护要求。以大同矿区某煤矿工作面生产实际为背景,对特厚煤层工作面进行了支架合理选型同时配以坚硬顶板的水压致裂控制技术,取得了良好的顶板控制效果。
In order to analyze the apparent mechanism of strong pressure in the face of the thick coal seam under the condition of hard roof in the multi-layer thin mined-out area and reasonably determine the support resistance of the support in the working face, the method of combining theoretical analysis and similar simulation with on- The principle of multi-layer roof breaking and the determination of the support resistance of working face under the condition of extra-thick coal seam mining are discussed, and the principle and method of determining the resistance of working face support are obtained. The results show that the breaking form and breaking order of multi-layer hard roof have obvious influence on the rock pressure of working face. Single-layer collapse or multi-layer synchronous instability of key roof will correspond to different face support resistance. Hard thick roof Under the conditions of synchronous instability, simply increasing the resistance of the support will be difficult to meet the reasonable support requirements of the working face of the special thick seam. Based on the actual production of a coal mine face in Datong Mine, the roof fracturing control technology has been achieved with the rational selection of supports and the hydraulic fracturing control technology with hard roof.