CAJ | 학술논문

为进一步认识底板破坏机理，运用半无限体理论计算了致使底板临界破坏的应力及位置，结合塑性力学的滑移线场理论推导出底板最大破坏深度计算公式，分析了底板最大破坏深度及其相关影响因素的关系，并通过算例分析说明了计算公式的合理性。结果表明：在煤壁塑性区范围一定的情况下，底板最大破坏深度随着底板岩石内摩擦角的增大而增大，随着底板岩石黏聚力的增大而减小。底板最大破坏深度不仅与采场端部煤体塑性区范围有关，而且随着工作面超前支承压力峰值的增大而增大。
위진일보인식저판파배궤리，운용반무한체이론계산료치사저판림계파배적응력급위치，결합소성역학적활이선장이론추도출저판최대파배심도계산공식，분석료저판최대파배심도급기상관영향인소적관계，병통과산례분석설명료계산공식적합이성。결과표명：재매벽소성구범위일정적정황하，저판최대파배심도수착저판암석내마찰각적증대이증대，수착저판암석점취력적증대이감소。저판최대파배심도불부여채장단부매체소성구범위유관，이차수착공작면초전지승압력봉치적증대이증대。
To further understand the failure mechanism of coal seam floor, the stress and location of the critical failure of the coal seam floor were determined by using the semi-infinite body theory. Based on this, the formula of maximum breakage depth of coal seam floor was derived by using the slip line field theory of the plastic mechanics, the relationship between the maximum breakage depth of the coal seam floor and its affecting factors was analyzed, and the rationality of the calculation formula was illustrated by the examples. The results showed that the maximum breakage depth of the coal seam floor increased with the increase of the internal friction angle of the floor rock and decreased with the increase of the cohesion of the floor rock in a fixed scope of the plastic zone of coal wall. The maximum breakage depth of coal seam floor was not only related to the scope of the plastic zone of the coal body at the end of the stope, but also increased with the increase of the peak value of the leading support pressure.