影响冲击地压危险性评价结果的Ⅱ类开采技术因素研究

发布时间：2018-07-18 07:12

【摘要】：针对目前冲击危险性评价方法的不足,提出了II类开采技术因素,并揭示了该类因素诱发煤岩震动异常并激发灾害发生的内在规律。结果表明,工作面推进度与高能震动事件频率成正比,推进度变化梯度与高能震动事件能量大小成正比,大的变化梯度将增加冲击地压突发的风险;煤层卸压爆破针对巷道两帮冲击启动区,爆破后7~18 h内是解危措施发挥作用的主要时段;巷帮扩修使得围岩从原有的相对稳定变为不稳定状态,扩修进尺过快显著影响煤岩震动异常;工作面停产后恢复生产时期,各能级的微震事件急剧上升,且伴随高能事件发生的危险。II类开采技术因素临时介入,打破原有平衡状态,使得煤岩宏观调整,微观破裂突然无序,激发煤岩冲击事件发生。
[Abstract]:In view of the deficiency of the present method of impact risk assessment, this paper puts forward the technical factors of class II mining, and reveals the inherent law of inducing abnormal vibration of coal and rock and arousing the occurrence of disasters. The results show that the working face advance degree is directly proportional to the frequency of high-energy vibration events, and the gradient of propelling degree is proportional to the energy of high-energy vibration events. The pressure relief blasting of coal seam is aimed at the impact start area of two sides of roadway, which is the main period of time of relieving danger measures within 7 ~ 18 hours after blasting, and the roadway side expansion and repair makes the surrounding rock change from the original relative stability to the unstable state. The abnormal vibration of coal and rock is significantly affected by the excessive expansion of the ruler, the microseismic events of each energy level rise sharply during the recovery period after the working face is shut down, and with the temporary intervention of the dangerous class II mining technical factors of high energy events, the original equilibrium state is broken. The macroscopic adjustment of coal and rock, the sudden disorder of micro-fracture and the occurrence of coal-rock shock.
【作者单位】：煤炭科学研究总院开采研究分院;天地科技股份有限公司开采设计事业部;
【基金】：国家重点研发计划(No.2016YFC0801401,No.2016YFC0801403) 国家自然科学基金项目(No.51574149) 天地科技开采生产力转化基金(No.KJ-2015-TDKC-05) 中国煤炭科工集团有限公司科技创新基金(No.2016MS010) 天地科技重点基金(No.KJ-2016-TDKC-01) supported by the State Key Project of Research and Development Plan(2016YFC0801401,2016YFC0801403) the National Natural Science Foundation of China(51574149) the Productivity Transformation Foundation of Tiandi Science and Technology Co.,Ltd.(KJ-2015-TDKC-05) the Technology Innovation Foundation of China Coal Science and Technology Group Co.,Ltd.(2016MS010) the Key Foundation of Tiandi Science and Technology Co.,Ltd.(KJ-2016-TDKC-01)
【分类号】：TD324;TD823

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