复合岩层诱导冒落发展过程及破坏特征研究  

Study on the Development Process and Failure Characteristics of Induced Caving in Composite Stratum

作　　者：钟敏 杨鹏[1,3] 胡颖鹏[2] ZHONG Min;YANG Peng;HU Ying-peng(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Environment and Resources,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Beijing Key Laboratory of Information Service Engineering,Beijing Union University,Beijing 100101,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]西南科技大学环境与资源学院,四川绵阳市621010 [3]北京联合大学北京市信息服务工程重点实验室,北京100101

出　　处：《矿业研究与开发》2022年第9期1-7,共7页Mining Research and Development

基　　金：国家自然科学基金重点项目(51534003)。

摘　　要：无底柱分段崩落法在正常回采之前必须先形成覆盖层。以某大型有色金属矿山由下向分层胶结充填法转无底柱分段崩落法为工程背景,采用PFC(Particle Flow Code)离散元数值模拟方法研究了由胶结充填体、片麻岩和第四系表土构成的复合顶板岩层诱导冒落发展过程和破坏特征。研究结果表明,在工程诱导条件下复合岩层将发生“胶结充填体拱形散体冒落+片麻岩整体岩柱滑落+第四系表土拱形散体冒落”的特殊复合冒落模式。崩落法首采分段回采结束后可形成厚度不小于30 m的散体覆盖层,同时在崩落法回采过程中,可通过调控回采顺序来延缓断层破坏时间,从而避免因断层破坏带来的地质灾害。在过渡期崩落法采场和充填法采场均应采取整体由东向西的顺序推进,二者在推进顺序和回采进度上保持时空协同,使两种采矿法的采场始终在平面上保持较大的距离,避免不同采场之间采动应力的不利影响,确保充填法与崩落法的安全高效协同开采。The sublevel caving method without sill pillar must form a covering layer before normal mining.Based on the engineering background of a large non-ferrous metal mine from downward layered cemented filling method to sublevel caving method without sill pillar,the development process and failure characteristics of induced caving of composite roof strata composed of cemented filling body,gneiss and quaternary topsoil were studied by PFC(Particle Flow Code)discrete element numerical simulation method.The research results show that under the condition of engineering induction,the special composite caving mode of“cemented filling arched loose body caving+gneiss integral rock column sliding+quaternary topsoil arched loose body caving”will occur in the composite rock stratum.After the first mining and sublevel mining,a loose overburden of no less than 30 m thick can be formed.At the same time,in the process of caving mining,the fault failure time can be delayed by controlling mining sequence,so as to avoid geological disasters caused by fault damage.During the transition period,the caving stope and filling stope should be pushed from east to west as a whole.The two stopes should maintain space-time coordination in the pushing sequence and mining progress,so that the two stopes always maintain a large distance on the plane,and avoid the adverse impact of mining stress between different stopes,so as to ensure the safe and efficient collaborative mining of filling method and caving method.

关 键 词：复合岩层 诱导冒落 PFC 回采方案 

分 类 号：TD325[矿业工程—矿井建设]