综采工作面回撤巷强矿压显现机理及控制技术

为保障厚煤层综采工作面回撤巷的安全使用，以鄂尔多斯纳林河二号井31102工作面回撤巷强矿压显现为背景，通过现场监测与理论分析相结合的方法，对厚煤层综采工作面开采过程中回撤巷强矿压显现进行研究。结果表明：厚煤层综采工作面回撤巷强矿压显现，主要为工作面采动引起的超前支承压力、相邻采空悬顶引起的双向支承应力，以及回撤巷开掘引起的静载三者耦合作用的结果。根据强矿压发生机理，提出回撤巷道及相邻巷道钻孔卸压和补强支护相结合的控制方案，使其处于“强支、强卸”状态。在相邻31103工作面回撤巷实施强矿压控制技术，通过现场观测和数据分析，表明强矿压控制技术效果良好，可有效保障回撤巷的安全使用。

Mechanism and control of strong ground pressure in fully mechanized mining face

In order to ensure the safe use of the withdrawal roadway in the fully mechanized mining face of thick coal seam, taking the strong ground pressure behavior of the withdrawal roadway in 31102 working face of Nalinhe No.2 well as the method of combination of field monitoring and theoretical analysis, the strong ground pressure behavior of the withdrawal roadway in the mining process of fully mechanized mining face in thick coal seam was studied. The results show that: the strong ground pressure behavior of withdrawal roadway in fully mechanized mining face of thick coal seam is mainly the result of coupling effect of advance abutment pressure caused by working face mining, bidirectional supporting stress caused by adjacent gob hanging roof, and static load caused by withdrawal roadway excavation. According to the occurrence mechanism of strong ground pressure, the control scheme of combining borehole pressure relief and reinforcement support for withdrawal roadway and adjacent roadway is put forward to make it in the state of “strong support and strong unloading”. Through field observation and data analysis, it shows that the effect of strong ground pressure control technology is good, which can effectively ensure the safe use of the withdrawal roadway.