半煤岩巷道快速综掘截割顺序优化研究

Study on optimization of rapid combined excavation cutting sequence in half-coal rock roadway

为了解决薄煤层条件下半煤岩巷道快速综掘的煤矿工程问题,针对半煤岩巷道快速综掘截割顺序设计与优化,采用三维快速拉格朗日法建立了数值计算模型,分析了不同截割顺序下分步开挖的围岩应力演化特征、剪切应变增量和剪切应变率的分布形态。基于灰色关联理论,建立了不同开挖方案的围岩位移与破裂范围分析模型,计算得到各参评方案的关联度分别为0.63,0.76,0.81和0.73,综合数值模拟与理论计算确定了最优综掘截割方案,最后结合具体工程对方案进行了验证。实践表明,先下后上、自右而左的倒"S"形综掘截割顺序可实现半煤岩巷道的最优化综掘,监测结果也表明了其合理性与可行性。

In order to solve the coal mine engineering problem of the rapid combined excavation in thin seam half-coal rock roadway, aiming at the design and optimization of combined excavation cutting sequence, the numerical model for analyzing the stress evolution of surrounding rock, the shape presentation of shear strain increment and shear strain rate under different excavation sequence has been established by using three-dimensional fast Lagrangian method in this paper. The displacement and rupture range analysis model of different excavation scheme has also been established based on the grey relation theory, and the correlation degree of each scheme has been obtained with the result of 0.63, 0.76, 0.81 and 0.73. Finally an optimal combined excavation cutting scheme has been determined based on the numerical simulation and theoretical calculations, which has been verified by the concrete project. The engineering practices have indicated that the combined excavation cutting sequence of ＂down-up, right-left＂ can achieve the optimal combined excavation in half-coal rock roadway. Meanwhile, the monitoring results have also proved its rationality and feasibility.