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为解决深井巷道强矿压显现频发问题,对深井条件两类典型巷道冲击巷帮煤体破坏机理进行了分析,采用数值模拟方法研究了水射流卸压技术对巷帮煤体应力集中区二次分布影响,提出了基于“强弱强”三重防冲结构的水射流卸压防冲方法。研究表明:水射流卸压段形成的弹塑性“弱结构”区使煤体中高应力单峰值区应力二次分布形成低应力双峰值区;随水射流卸压段长度的递增,低应力内峰值区向煤体深部转移,且内峰值逐渐减小趋于原岩应力。现场水射流卸压区的电磁辐射值、钻屑量和矿震事件定位结果表明该技术有较好的应用效果。
In order to solve the problem of frequent occurrence of strong pressure in deep tunnel, the destruction mechanism of coal in the impact tunnel of two typical tunnels in deep conditions was analyzed. The numerical simulation method was used to study the influence of water jet pressure relief technology This paper puts forward a water jet pressure relief method based on triple strong anti-impact structure. The results show that the elastic-plastic “weak structure” zone formed by the pressure-relief section of the water jet forms a bimodal zone with low stress in the single-peak zone of high-stress and single-peak stress distribution. With the increase of pressure relief section length and low stress The inner peak area shifts to the deep part of coal, and the inner peak value gradually decreases to the original rock stress. The results of electromagnetic radiation, drill cuttings and events of on-site water jet pressure relief area show that the technology has good application effect.