深部高应力巷道围岩力学特征及稳定性控制技术

针对九龙煤矿-890m进风行人大巷复杂的工程地质情况,巷道断面较大且高应力作用显著,现已发生严重变形破坏。通过FLAC3D数值模拟对巷道围岩的力学特征进行定量分析,获得深部高应力巷道应力、应变演化特征,结合巷道周边围岩的成分分析、力学实验结果,基于FLAC3D对比优化深部高应力巷道联合支护方案,探究支护结构、支护参数的可靠性,提出以锚杆、锚索为核心的锚网索喷联合支护方案。在巷道开挖后进行矿压观测,进一步验证支护方案以及数值模拟结果的合理性,并实时监测围岩的变化特征。工程实践表明,在深部高应力巷道中采用锚网索喷联合支护,巷道的整体性与稳定性得到有效改善,围岩受力更趋稳定,变形得到有力控制,为煤矿的安全高效生产提供了技术支持。

Mechanical Characteristics and Stability Control Technology of Deep Roadway under High Stress

Specific to Jiulong Coal Mine -890 meters air inlet pedestrian roadway has serious deformation and destruction due to its complicated engineering geological conditions, large chamber cross section and significant effects of high stress. The paper carried out quantitative analysis of the mechanical characteristics of surrounding rocks of roadway through FLAC_3D numerical simulation to obtain deep high-stress roadway stress and strain evolution characteristics, combining with composition analysis, mechanical test results of surrounding rocks of roadway. Based FLAC_3D contrast optimization deep and high stress roadway combination support programs, explore supporting structure, supporting the reliability parameters, the author proposed the wire rope combined supporting scheme taking the anchor bolt and anchor cable as the core. Making the mine pressure observation after the roadway excavation, further verify the rationality of the supporting scheme and the result of numerical simulation, and monitoring the variation characteristics of surrounding rock. Engineering practice shows that adopting the bolt-anchor-shotcrete-mesh combined supporting scheme in the deep roadway under high stress, to effectively improve the integrity and the stability of the roadway. The surrounding rock stress becomes more stability, and the deformation gets more effective control, providing the technical support for the safety and efficient production in the coal mine.