Aiming at the rock burst prevention in coal mines,this study argue that a rock burst is the instability of the coal mass deformation system with the infinite deformation response subjected to a small disturbance,and t...Aiming at the rock burst prevention in coal mines,this study argue that a rock burst is the instability of the coal mass deformation system with the infinite deformation response subjected to a small disturbance,and the concepts of control,disturbance and response variables of the coal mass deformation system are proposed.The analytical solution of rock bursts of circular roadways is derived,using a mechanical model of the coal mass deformation system of circular roadways,and the stress and energy conditions of the disturbance response instability of a rock burst are also presented.Based on the disturbance response instability theory,this study identifies the factors controlling the occurrence of rock bursts,involving the coal uniaxial compressive strength,coal bursting liability and roadway support stress.The relationship between the critical stress and the critical resistance zone of surrounding rock in roadways,the coal uniaxial compressive strength,roadway support stress,roadway geometric parameters and coal burst liability is revealed,and the critical stress index evaluation method of rock burst risk is proposed.Considering the disturbance and response variables of rockburst occurrence,a monitoring system of rock burst based on stress and energy monitoring is established.Considering managing the disturbance and control variables,regional and local prevention measures of rock burst are proposed from four aspects:destressing in coal mass,avoiding the mutual disturbance between multi-group mining or excavation,reducing the dynamic load disturbance and weakening of the physical properties of the coal mass.Based on the enhancement principle of the roadway support stress on the critical load of rockburst occurrence and the energy absorption effect of the support,an energy absorption and anti-bursting support technology for roadways are proposed.The disturbance response instability theory of rock bursts has formed a technical system from the aspects of mechanism,prediction and prevention to guide the engineering practice for rock burst mitigation.展开更多
冲击地压作为煤矿生产过程中常见的动力灾害,给煤矿安全生产带来极大威胁,因此,工作面回采前进行冲击危险性评价尤为重要。为构建冲击地压危险性的科学评价模型,本文收集和研究了140个煤矿工作面实例,分析了冲击地压的影响因素,从每个...冲击地压作为煤矿生产过程中常见的动力灾害,给煤矿安全生产带来极大威胁,因此,工作面回采前进行冲击危险性评价尤为重要。为构建冲击地压危险性的科学评价模型,本文收集和研究了140个煤矿工作面实例,分析了冲击地压的影响因素,从每个案例中提取14项评价指标,并建立了数据库。基于数量化理论评价法与模糊评价法,建立了适用性更强的TWF(theory of quantification with fuzzy evaluation)评价法,该方法继承了数量化理论和模糊评价法的优势,并将煤矿冲击危险程度划分为5个等级。以河南某煤矿工作面为背景,采用TWF冲击危险性评价模型对该工作面进行了冲击危险性评价,得出危险性指数为19.83,评价结果为无冲击危险性,与现场实际相符,表明该评价模型具有较强的适用性;开发了TWF综合评价系统,持续的案例补充可不断提高TWF评价模型的评价精度,研究成果可为冲击地压危险评价提供一定的理论参考。展开更多
基金supported by the National Natural Science Foundation of China(51974150 and U1908222)National key research and development program(2022YFC3004605).
文摘Aiming at the rock burst prevention in coal mines,this study argue that a rock burst is the instability of the coal mass deformation system with the infinite deformation response subjected to a small disturbance,and the concepts of control,disturbance and response variables of the coal mass deformation system are proposed.The analytical solution of rock bursts of circular roadways is derived,using a mechanical model of the coal mass deformation system of circular roadways,and the stress and energy conditions of the disturbance response instability of a rock burst are also presented.Based on the disturbance response instability theory,this study identifies the factors controlling the occurrence of rock bursts,involving the coal uniaxial compressive strength,coal bursting liability and roadway support stress.The relationship between the critical stress and the critical resistance zone of surrounding rock in roadways,the coal uniaxial compressive strength,roadway support stress,roadway geometric parameters and coal burst liability is revealed,and the critical stress index evaluation method of rock burst risk is proposed.Considering the disturbance and response variables of rockburst occurrence,a monitoring system of rock burst based on stress and energy monitoring is established.Considering managing the disturbance and control variables,regional and local prevention measures of rock burst are proposed from four aspects:destressing in coal mass,avoiding the mutual disturbance between multi-group mining or excavation,reducing the dynamic load disturbance and weakening of the physical properties of the coal mass.Based on the enhancement principle of the roadway support stress on the critical load of rockburst occurrence and the energy absorption effect of the support,an energy absorption and anti-bursting support technology for roadways are proposed.The disturbance response instability theory of rock bursts has formed a technical system from the aspects of mechanism,prediction and prevention to guide the engineering practice for rock burst mitigation.
文摘冲击地压作为煤矿生产过程中常见的动力灾害,给煤矿安全生产带来极大威胁,因此,工作面回采前进行冲击危险性评价尤为重要。为构建冲击地压危险性的科学评价模型,本文收集和研究了140个煤矿工作面实例,分析了冲击地压的影响因素,从每个案例中提取14项评价指标,并建立了数据库。基于数量化理论评价法与模糊评价法,建立了适用性更强的TWF(theory of quantification with fuzzy evaluation)评价法,该方法继承了数量化理论和模糊评价法的优势,并将煤矿冲击危险程度划分为5个等级。以河南某煤矿工作面为背景,采用TWF冲击危险性评价模型对该工作面进行了冲击危险性评价,得出危险性指数为19.83,评价结果为无冲击危险性,与现场实际相符,表明该评价模型具有较强的适用性;开发了TWF综合评价系统,持续的案例补充可不断提高TWF评价模型的评价精度,研究成果可为冲击地压危险评价提供一定的理论参考。
