摘要
随着煤炭资源开采向深部推进,大采高综采技术因高效单产和资源回收率显著提升,在厚煤层开采中占据核心地位。然而,深部复杂地质条件与大采高开采引发的强烈采动效应叠加,导致覆岩结构失稳风险与动力灾害威胁显著增加,对安全高效开采构成挑战。采用离散元数值模拟软件UDEC/3DEC,建立大采高开采分析模型,对不同采高时上覆岩层的应力变化进行仿真分析,并记录分析煤壁应力变化。结果显示,采高增加导致压力上升区范围显著扩大,更多围岩体受劣化影响,煤壁稳定性削弱。在煤岩垂直分布上,中部岩体应力变化波动率较小,应力状态稳定;而上下煤壁应力波动率较大,应力状态复杂非均匀。本研究为优化开采参数、预防动力灾害提供了科学依据,对指导大采高综采实践具有重要意义。
With the deepening of coal resource mining,the large and high comprehensive mining technology occupies a core position in thick coal seam mining due to its significant improvement in efficient yield and resource recovery rate.However,the combination of complex geological conditions in deep areas and strong mining effects caused by high mining heights has significantly increased the risk of instability of overlying rock structures and the threat of dynamic disasters,posing a challenge to safe and efficient mining.Using the discrete element numerical simulation software UDEC/3DEC,a large mining height analysis model was established to simulate and analyze the stress changes of overlying rock layers at different mining heights,and record and analyze the stress changes of coal walls.The results show that the increase in mining height leads to a significant expansion of the pressure rise zone,more surrounding rock mass is affected by deterioration,and the stability of coal walls is weakened.In the vertical distribution of coal and rock,the stress fluctuation rate of the central rock mass is relatively small,and the stress state is stable.The stress fluctuation rate of the upper and lower coal walls is relatively large,and the stress state is complex and non-uniform.This study provides a scientific basis for optimizing mining parameters and preventing dynamic disasters,which is of great significance for guiding the practice of the large and high comprehensive mining.
作者
王豹
Wang Bao(Shanxi Coking Coal Xishan Coal Electricity Dongqu Coal Mine,Taiyuan Shanxi 012200,China)
出处
《山西化工》
2025年第12期254-256,共3页
Shanxi Chemical Industry
关键词
大采高综采
煤壁稳定性
位移变形
仿真分析
液压支架
the large and high comprehensive mining technology
coal wall stability
displacement deformation
simulation analysis
hydraulic support
