A thick-hard roof implies a large hanging-roof and high-frequency dynamic strata behaviour during mining, which may jeopardise personnel safety and equipment. To alleviate these hazards, deep-hole pre-splitting blasting is employed to control periodic fractures in thick-hard roof seams in Datong mining area. Based on loading and instability characteristics, a mechanical model of thick-hard roof periodic collapse is established to investigate the relationships and optimal parameters among the collapse interval, fracturing angle and support working resistance. LS-DYNA was employed to analyse the fracture evolution to determine the optimal charge parameters. The minimum weakening width and average fragmentation of the pre-split roof are obtained. Universal distinct element code simulations were used to determine the thick-hard roof collapse morphology and strata behaviour to confirm the optimal pre-splitting parameters. The deep-hole pre-splitting blasting on-site implementation reduces thick-hard roof collapse intervals, and the supports loading is verified to be safe with sufficient allowance, which show a good control effect on thick-hard roof seams.

厚硬顶板意味着在开采过程中存在较大的悬顶和高频动力地层行为，可能危及人员安全和设备。为减轻这些危害，大同矿区采用深孔预裂爆破控制厚硬顶板煤层的周期性裂缝。基于荷载和失稳特性，建立了厚硬顶板周期性倒塌力学模型，研究了倒塌间隔、破裂角度和支护工作阻力之间的关系和优化参数。LS-DYNA 用于分析裂缝演化以确定最佳装药参数。得到了预裂顶板的最小弱化宽度和平均破碎度。通用不同元素代码模拟用于确定厚硬顶板倒塌形态和地层行为，以确认最佳预分裂参数。现场实施深孔预裂爆破，减少了厚硬顶板坍塌间隔，验证了支座加载安全，余量充足，对厚硬顶板接缝控制效果良好。