不规则采场应力分布特征的面长效应

为了研究煤层开采过程中采场覆岩破坏与超前应力之间的关系,采用FLAC3D软件对不同面长条件下采场前方支承压力与水平应力的分布特征和动态演化过程进行数值模拟,并从理论层面分析了不等长工作面力学效应与岩层活动存在的规律。结果表明:工作面推进长度直接影响采场前方的应力分布,当工作面推进到"见方"期或推进距离是工作面斜长的整数倍位置时,应力急剧增大;采场覆岩的变形与破坏是水平应力和支承压力共同作用的结果;不规则工作面推进过程中,在对接面前后20~30 m的范围内应力过度集中,数值波动较大;等长工作面在顶板管理与围岩控制效果方面较不等长工作面有着明显优势。工程实例验证了结论的可靠性。

Slope length effect of stress distribution characteristics of irregular stope

In order to study the relationship between overburden rock destruction and the ahead of stress in the process of coal seam mining，under the conditions of different slope length working face abutment pressure and horizontal pressure distribution characteristics and evolutionary process were simulated using the software FLAC3D.In addition，the law between mechanical effects of unequal length face and rock movement was analyzed theoretically.The results show that the length of face advance directly affects the stope front of the stress distribution，when working face advances the same distance as slope length or an integer multiple of the position of slope length，the stress increases rapidly；Overburden rock deformation and failure are the results of abutment pressure and horizontal pressure；In the process of irregular working face advancing，within the range of 20 to 30 meters of docking face stress concentrates deucedly，the stress changes largely；In the aspects of roof management and surrounding rock control effect of working face，formal face is much better than different length of working face.Engineering examples demonstrate the reliability of the conclusions.