采动过程中覆岩破碎区碎胀性走向分布特征  

Distribution Characteristics of Dilatancy in Overburden Fracture Zone During Mining

作　　者：宋天奇 朱磊 刘成勇 古文哲 刘治成 秋丰岐 袁超峰 SONG Tian-qi;ZHU Lei;LIU Cheng-yong;GU Wen-zhe;LIU Zhi-cheng;QIU Feng-qi;YUAN Chao-feng(China Coal Energy Research Institute,Xian 710054,China;College of Energy Engineering,Xian University of Science&Technology,Xian 710054,China)

机构地区：[1]中煤能源研究院有限责任公司,西安710054 [2]西安科技大学能源学院,西安710054

出　　处：《科学技术与工程》2023年第23期9881-9887,共7页Science Technology and Engineering

基　　金：中煤集团重大科技专项(21-02)。

摘　　要：为了探究采动过程中覆岩破碎区碎胀性在走向分布规律,采用UDEC数值模拟及相似模拟手段分析了煤层顶板运移规律及碎胀系数分布特征。结果表明:随着采空区上覆岩层空间结构发展的演化,煤层顶板下沉量由下至上逐层降低,并最终趋于稳定;在工作面推进方向上,碎胀系数不断降低,且呈现出一定的分区特性,随回采呈现动态变化的周期性前移,其在走向上划分为三个区域,即:自然堆积区、载荷影响区、逐渐压实区。最后,确定浆体充填滞后距离为60 m,现场试验邻位注浆充填效果良好。In order to explore the trend distribution law of the dilatancy in the fractured area of overburden during mining,the mi-gration law of coal seam roof and the distribution characteristics of the dilatancy coefficient were analyzed by UDEC numerical simula-tion and similar simulation.The results show that with the evolution of the spatial structure of the overlying strata in the goaf,the sub-sidence of the coal seam roof decreases layer by layer from bottom to top,and finally tends to be stable.In the advancing direction of the working face,the coefficient of dilatancy decreases continuously,and presents certain zoning characteristics,showing a periodic forward movement of dynamic changes with the mining.It is divided into three areas in strike,namely natural accumulation area,load affected area and gradual compaction area.Finally,it is determined that the lag distance of slurry filling is 60 m,and the effect of ad-jacent grouting filling is good in the field test.

关 键 词：覆岩破碎区 浆体充填 空隙空间 相似模拟 数值模拟 

分 类 号：TD82[矿业工程—煤矿开采]