During deep mining, the excavation disturbance stress path is the domination factor for the stability of the surrounding rock mass as well as the ground pressure. One of the important parameters of the stress path is the loading or unloading rate of the disturbed rock or coal, which depended on the mining rate. To achieve a well understanding of the mining rate and its effect on the coal behavior, a preliminary case investigation of the mechanical properties of the coal at the various mining rates in both the laboratory scale and field scale was performed. Based on the uniaxial compression test and the digital image correlation (DIC) method, the mechanical behavior of the coal samples, such as the evolution of the strength, surface deformation, crack propagation, and elastic strain energy of the coal under the various loading rates were analyzed. A threshold range of the loading rate has been observed. The uniaxial compressive strength (UCS) and releasable elastic strain energy (U^e) increase with increasing loading rate when the loading rate is below the threshold. Otherwise, the UCS and U^e may decrease with the loading rate. Under the low loading rate (≤0.05 mm/min), the tensile deformation of the original defects could result in crack coalescence, whereas failure of the coal matrix is the key contributor to the crack coalescence under the high loading rate (greater than0.05 mm/min). Afterwards, with the consideration of the bearing capacity (UCS) and energy release of the mining-disturbed coal mass (U^e), a power exponential relationship between the mining rate (M_R) in the field and the critical loading rate (v_c) in the laboratory was proposed. The application potential of the formulas was then validated against the field monitored data. Finally, based on the critical loading rate, the released strain energy, and the monitored pressure on the roof supports, a reasonable mining rate M_R for the Ji₁₅-31030 working face was determined to be approximately 3 m/d.

在深部开采过程中，开挖扰动应力路径是影响围岩稳定性和地压的主导因素。应力路径的重要参数之一是受扰动的岩石或煤的装载或卸载速率，这取决于开采速率。为了更好地了解开采速度及其对煤行为的影响，在实验室规模和现场规模下，对不同开采速度下煤的机械特性进行了初步案例调查。基于单轴压缩试验和数字图像相关（DIC）方法，煤样的力学行为，如在不同加载速率下煤的强度、表面变形、裂纹扩展和弹性应变能的演变进行了分析。已观察到加载速率的阈值范围。单轴抗压强度 (UCS) 和可释放弹性应变能 (当加载率低于阈值时，U ^e ) 随着加载率的增加而增加。否则，UCS 和U ^e可能会随着加载速率的增加而减小。在低加载速率（≤0.05 mm/min）下，原始缺陷的拉伸变形会导致裂纹合并，而在高加载速率（大于0.05毫米/分钟）。之后，考虑采动煤体的承载力（UCS）和能量释放（U ^e），现场采煤率（M _R）与临界载荷率（v _c）之间存在幂指数关系。) 在实验室提出。然后根据现场监测数据验证配方的应用潜力。最后，基于临界负荷率，释放的应变能，并在屋顶支撑所监视的压力，一个合理的挖掘速率中号_[R为籍₁₅ -31030工作面被确定为大约3米/ d。