巨厚煤层分层综放开采覆岩运移演化空间大，造成采场局部应力集中，覆岩内部能量积聚，覆岩破断失稳易诱发采场动力失稳，严重威胁矿井安全高效生产。论文以准东二矿巨厚煤层首分层1101综放工作面为背景，通过理论分析、煤样力学实验、相似模拟等研究方法，开展了不同加载速率煤样力学响应特征研究，分析了不同开采强度下覆岩应力、能量演化特征，揭示了覆岩运移破断与能量释放规律。

通过建立巨厚煤层分层综放开采力学模型，理论分析揭示了随开采强度提高，相同时间内覆岩悬臂梁长度逐渐增大，覆岩应力集中程度随之增大，进而导致顶板弯矩及弯曲弹性能集中，覆岩顶板破断时易诱发能量集中释放。基于不同加载速率煤样力学实验，得出随加载速率增大，煤样峰值强度、弹性模量、煤样总能量、弹性能、声发射累计能量及均值能量均表现出明显增长趋势，煤样破坏程度也相应较高；同时，由于水的弱化效应，饱水煤样的整体力学性质较自然煤样均明显下降，破碎程度也更为明显。不同开采强度相似模拟实验表明，随推进速度加快，采场支架压力明显增大，覆岩运移剧烈，能量释放强烈，覆岩破断呈现悬臂梁结构，随推进速度提高，悬臂梁长度逐渐增大，垮落结构较为完整，致使其内部积聚的弹性能越多，能量集中程度越来越高，覆岩整体切落易诱发采场大面积来压，冲击危险性逐渐增大。借助三维数值仿真实验，得到随推进速度提高，覆岩应力集中现象越明显，峰值应力逐渐增大，覆岩初次垮落步距随推进速度提高逐渐增大，覆岩内部弹性能积聚，煤壁前方应变能密度峰值逐渐增大，工作面冲击危险性随推速度提高逐渐增强。

本研究为巨厚强冲击倾向性煤层综放面的安全高效开采提供了参考。

The overburden transport and evolution space of the layered and comprehensive mining of the giant thick coal seam is large, resulting in the concentration of local stress in the stope, the accumulation of energy inside the overburden, and the instability of overburden fracture can easily induce the dynamic instability of the stope, which seriously threatens the safe and efficient production of the mine. Based on the background of the 1101 comprehensive discharge face of the first layer of the huge thick coal seam of the Zhundong No. 2 Mine, this paper studies the mechanical response characteristics of coal samples with different loading rates through theoretical analysis, coal sample mechanical experiments, similar simulation and other research methods, analyzes the stress and energy evolution characteristics of overburden under different mining strengths, and reveals the law of overburden migration fracture and energy release.

By establishing the mechanical model of layered fully mechanized caving mining of huge thick coal seam, the theoretical analysis reveals that with the increase of mining intensity, the length of overlying cantilever beam gradually increases in the same time, and the stress concentration degree of overlying rock increases, which leads to the concentration of bending moment and bending elastic energy of the roof, and easy to induce the concentrated release of energy when the overlying roof is broken. Based on the mechanical experiments of coal samples at different loading rates, it is concluded that with the increase of loading rate, the peak strength, elastic modulus, total energy of coal samples, elastic energy, cumulative energy of acoustic emission and average energy of coal samples all show an obvious increasing trend, and the damage degree of coal samples is correspondingly higher. At the same time, due to the weakening effect of water, the overall mechanical properties of water-saturated coal samples are significantly lower than those of natural coal samples, and the degree of breakage is more obvious. The similar simulation experiments of different mining intensities show that with the acceleration of the advancing speed, the stope support pressure increases obviously, the overburden migration is intense, the energy is released strongly, and the overburden fracture presents a cantilever beam structure. With the increase of the advancing speed, the cantilever beam length increases gradually, and the caving structure is more complete, resulting in the more elastic energy accumulated inside and the higher the energy concentration degree. Overall overburden cutting is easy to induce large area of stope pressure, and the impact risk increases gradually. With the help of three-dimensional numerical simulation experiment, it is obtained that with the increase of pushing speed, the stress concentration phenomenon of overlying rock becomes more obvious, the peak stress gradually increases, the initial caving step of overlying rock gradually increases with the increase of pushing speed, the elastic energy in overlying rock accumulates, the peak strain energy density in front of coal wall gradually increases, and the impact risk of working face gradually increases with the increase of pushing speed.

This study provides a reference for the safe and efficient mining of fully mechanized caving face of coal seam with huge thickness and strong bursting liability.