南阳坡矿沿空巷道底鼓成因分析及支护技术

Genesis Analysis and Support Technology of Gob-side Entrydriving Floor Heave in Nanyangpo Coal Mine

针对南阳坡矿沿空巷道底板变形控制困难的问题,分析了其工程地质条件,并通过建立沿空巷道底板力学模型推导出巷道底板应力、应变公式,计算并总结了巷道底鼓成因。在研究底角锚杆支护原理的同时,采用数值模拟的方法,对比分析了无底板支护和加强底板支护条件下围岩位移和塑性区的分布情况,验证了通过提高底板围岩强度抑制底板变形的可行性。以南阳坡矿5800沿空巷道为研究背景,设计出该沿空巷道的底板支护方案为:底板锚杆、底角锚杆以及注浆加固,并通过现场观测,进一步证明了该支护方案的现场实际应用效果。应用结果表明,该支护方案能够有效提高底板围岩强度,改善底板变形,控制底鼓。

For the problem of difficult deformation control of the floor of the gob roadway of Nanyangpo Coal Mine,analysis of its engineering geological conditions is performed. The stress and strain formulas of the roadway floor are derived by establishing the mechanical model of the floor way along the roadway,and the cause of the tunnel bottom drum is calculated and summarized. While studying the principle of the base-angle-bolt by using numerical simulation,the distribution of surrounding rock displacement and plastic zone under the condition of no floor support and reinforcement floor support is compared and analyzed. It is verified that the feasibility of suppressing the deformation of the bottom plate by increasing the strength of the surrounding rock of the floor. Taking the 5800 gobside along entry driving of Nanyangpo Coal Mine as the research background,the bottom plate support form of the roadway is designed as floor anchor,base-angle-bolt and grouting reinforcement,and through field observation,the actual application effect of the support scheme on the spot is further proved. The application results show that the support scheme can effectively improve the strength of the surrounding rock of the floor,improve the deformation of the floor and control the bottom drum.