综放采场支承压力对覆岩裂隙发育规律的影响机理研究

煤体采动后采场原有应力平衡被破坏,工作面前方支承压力动态变化,引起采场上覆岩体失稳变形直至破断,形成采动应力降低区以及采动裂隙场。通过RFPA有限元法再现了综放工作面开采过程中上覆岩层裂隙时空动态演化特点,并得出工作面前方支承压力及裂隙发育高度的量化数据。综合考虑相似模拟实验数据,以期为高位瓦斯抽放巷的合理布置提供参考依据。

Study on Influence Mechanism of Abutment Pressure on Development Rule of Overlying Rock's Fissures in Fully-mechanized Caving Face

After coal mining,the original stress equilibrium of the stope was disrupted,the dynamic change of the abutment pressure in front of the working face caused the overlying strata of the stope to become instable,deformed or even broken,as a result,a decreasing zone of mining stress and a mining fissure field were formed.In this paper,the space-time dynamic evolution regularity of the fissures in overlying strata in a fully mechanized caving face was reproduced by FRPA finite element method,and the quantitative data of the abutment pressure and the fissure development height in front of the working face were obtained,this thus finally provided reference basis for the rational layout of the high-located gas drainage entry on the basis of the comprehensive consideration of the similarity simulation experiment data.