During the excavation of deep coal and rock mass, the radial stress of the free face changes from three-dimensional compression state to two-dimensional stress, bearing the combined action of dynamic disturbance and s...During the excavation of deep coal and rock mass, the radial stress of the free face changes from three-dimensional compression state to two-dimensional stress, bearing the combined action of dynamic disturbance and static load at the same time. With that, many mines suffer from dynamic disasters, such as coal and gas outburst, rock burst and rock caving during deep mining excavation, which is often accompanied by plate crack, spalling and other disasters, seriously affecting the stability of stope and roadway. Taking thin rectangular coal and rock mass as the research object, the dual equation of the free vibration was derived and the exact solution model of the free vibration was established with the use of Hamilton dual system. Based on the action characteristics of the uniform impact load, the effective mode of the forced vibration was obtained by using the Duhamel integral principle and the orthogonality of the mode function. Based on the third strength theory and the numerical simulation results, the dynamic damage process and development trend of coal and rock mass were analyzed under uniform impact load. It was concluded that the starting position of dynamic damage can be judged by the first order main mode, and the development direction and trend of the damage can be judged by the fifth and sixth order main modes. It was concluded that the vibration mode functions of coal and rock mass with four side fixed (C-C-C-C), the two sides fixed and simply supported on the other (S-C-S-C) are mainly composed of three modes that are the first order (dominant frequency), the fifth order and the sixth order, from which the dynamic damage mechanism is preliminarily studied.展开更多
针对煤矿矩形巷道支护参数设计问题,采用模糊数学对煤巷围岩稳定性的类别进行分析。选择顶板岩石单轴抗压强度、底板岩石单轴抗压强度、煤层单轴抗压强度、巷道埋深、采动影响系数、护巷煤柱宽度、围岩完整程度7个指标作为矩形巷道围岩...针对煤矿矩形巷道支护参数设计问题,采用模糊数学对煤巷围岩稳定性的类别进行分析。选择顶板岩石单轴抗压强度、底板岩石单轴抗压强度、煤层单轴抗压强度、巷道埋深、采动影响系数、护巷煤柱宽度、围岩完整程度7个指标作为矩形巷道围岩稳定性分析指标,并根据不同的围岩稳定性类型选用不同的支护形式;采用(内嵌数值模拟软件优化、CAD)支护设计方法进行设计,并进行合理的支护参数计算,通过数据库中的诸多样本判断类似的样本数据以自动选择合理的支护方案。以Visual Studio 2022为开发工具,利用SQL Sever 2019构建了围岩力学参数、支护参数、围岩稳定性等信息巷道信息数据库,采用C#语言进行计算机编程,实现了巷道参数数据库管理、围岩稳定性分类、支护参数智能设计等功能。展开更多
文摘During the excavation of deep coal and rock mass, the radial stress of the free face changes from three-dimensional compression state to two-dimensional stress, bearing the combined action of dynamic disturbance and static load at the same time. With that, many mines suffer from dynamic disasters, such as coal and gas outburst, rock burst and rock caving during deep mining excavation, which is often accompanied by plate crack, spalling and other disasters, seriously affecting the stability of stope and roadway. Taking thin rectangular coal and rock mass as the research object, the dual equation of the free vibration was derived and the exact solution model of the free vibration was established with the use of Hamilton dual system. Based on the action characteristics of the uniform impact load, the effective mode of the forced vibration was obtained by using the Duhamel integral principle and the orthogonality of the mode function. Based on the third strength theory and the numerical simulation results, the dynamic damage process and development trend of coal and rock mass were analyzed under uniform impact load. It was concluded that the starting position of dynamic damage can be judged by the first order main mode, and the development direction and trend of the damage can be judged by the fifth and sixth order main modes. It was concluded that the vibration mode functions of coal and rock mass with four side fixed (C-C-C-C), the two sides fixed and simply supported on the other (S-C-S-C) are mainly composed of three modes that are the first order (dominant frequency), the fifth order and the sixth order, from which the dynamic damage mechanism is preliminarily studied.
文摘针对煤矿矩形巷道支护参数设计问题,采用模糊数学对煤巷围岩稳定性的类别进行分析。选择顶板岩石单轴抗压强度、底板岩石单轴抗压强度、煤层单轴抗压强度、巷道埋深、采动影响系数、护巷煤柱宽度、围岩完整程度7个指标作为矩形巷道围岩稳定性分析指标,并根据不同的围岩稳定性类型选用不同的支护形式;采用(内嵌数值模拟软件优化、CAD)支护设计方法进行设计,并进行合理的支护参数计算,通过数据库中的诸多样本判断类似的样本数据以自动选择合理的支护方案。以Visual Studio 2022为开发工具,利用SQL Sever 2019构建了围岩力学参数、支护参数、围岩稳定性等信息巷道信息数据库,采用C#语言进行计算机编程,实现了巷道参数数据库管理、围岩稳定性分类、支护参数智能设计等功能。
