Emergency Management Bureau in Zhongyang County

坤龙煤矿多煤层开采过程中残余煤柱-围岩联动破坏失稳对煤矿安全生产造成严重的影响,为降低煤矿安全事故的发生,采用理论分析、数值模拟和现场监测的综合研究方法,确定多煤层开采残余煤柱-围岩联动失稳的有效监测区域和监测设计方法,建立灾害风险评估指标和风险评估方法,并通过工程案例进行了验证。残余煤柱-围岩联动失稳致灾程度的主要评估指标为微震能量、残余煤柱破坏程度、裂隙发育高度,根据评估指标的实测值,采用模糊综合评估法计算出研究矿井的灾害风险程度属于Ⅲ级,即中等风险等级。现场实测结果表明,电磁辐射计的频率和容量明显减弱,能量降低了68.2%,煤体和煤柱的应力和压力明显降低。

The residual coal pillar-surrounding rock linkage failure and instability in the multi coal seam mining process of Kunlong Coal Mine cause a serious impact on coal mine safety production. In order to reduce the occurrence of coal mine safety accidents, a comprehensive research method of theoretical analysis, numerical simulation, and on-site monitoring is adopted to determine the effective monitoring area and monitoring design method of the residual coal pillar-surrounding rock linkage instability in multi coal seam mining. Disaster risk evaluation indicators and risk assessment methods are established, and verified through engineering cases. The main evaluation indicators for the disaster-causing degree of residual coal pillar-surrounding rock linkage instability are microseismic energy, damage degree of residual coal pillar, and crack development height. According to the actual measured values of the evaluation indicators, the fuzzy comprehensive evaluation method is used to calculate that the disaster risk level of the studied mine belongs to level Ⅲ, that is, medium risk level. The on-site actual measurement results show that the frequency and capacity of the electromagnetic radiometer are significantly weakened, the energy is decreased by 68.2%, and the stress and pressure of the coal body and coal pillar are significantly decreased.