充填开采下顶板-间柱支撑体系的突变失稳分析  

Analysis of catastrophic instability of roof-rib pillar support system under backfill mining

作　　者：刘轩廷 陈从新[1,2] 刘秀敏 夏开宗[1,2] 张褚强 王田龙[1,2] 王月 LIU Xuan-ting;CHEN Cong-xin;LIU Xiu-min;XIA Kai-zong;ZHANG Chu-qiang;WANG Tian-long;WANG Yue(State Key Laboratory of Geomechanics and Geolechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan.Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan,Hubei 430068,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中国科学院大学,北京100049 [3]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《岩土力学》2021年第9期2461-2471,共11页Rock and Soil Mechanics

基　　金：国家自然科学基金青年基金项目(No.42002292)。

摘　　要：对于采用充填法开采的金属矿山,在实际开采过程中往往会形成顶板-间柱支撑体系。为了保证矿山的安全生产,探究充填开采下顶板-间柱支撑体系的破坏机制具有重要意义。在考虑了充填体对间柱侧压作用的基础上,建立了充填开采下顶板-间柱支撑体系的力学模型,在此基础上应用突变理论探究了充填体作用下支撑体系的破坏机制,分析了充填前后支撑体系的结构参数对于采场稳定性的影响。研究结果表明:在岩体力学性质一定的情况下,充填开采下的顶板-间柱支撑体系的稳定性由采场结构参数(顶板厚度、采场跨度、间柱宽度、间柱高度)和上覆荷载、充填体侧压作用共同控制;充填体的加入会降低支撑体系的刚度比,进而提高采场的稳定性;在对支撑体系的结构参数进行优化时,当采场处于未充填状态时,优化顺序应为顶板厚度、采场跨度、间柱宽度、间柱高度;当采场处于充填状态时,优化顺序应为顶板厚度、间柱宽度、采场跨度、间柱高度。将理论推导与数值模拟相结合应用在工程实例上,验证了理论推导的正确性。A roof-rib pillar support system is often formed in the metal mines that applied to the backfill mining method. In order to ensure the safe mining, it is of great significance to explore the failure mechanism of the roof-rib pillar support system under backfill mining. On the basis of considering the side pressure effect of the backfill on the rib pillar, a mechanical model of the roof-rib pillar support system under backfill mining was established. Furthermore, the catastrophe theory was used to explore the failure mechanism of the supporting system under the action of the filling body, and the influence of the structural parameters of the support system before and after filling on the stability of the stope was analyzed. The research results show that under the condition of certain mechanical properties of the rock mass, the stability of the roof-rib pillar support system under backfill mining is controlled by the stope structure parameters(roof thickness, stope span, rib pillar width, rib pillar height), the overburden load and the side pressure of the backfill. The addition of the filling body will reduce the stiffness ratio of the support system, thereby improving the stability of the stope. When the stope is at an unfilled state, the optimization sequence of the structural parameters of the support system should be roof thickness, stope span, rib pillar width and rib pillar height. When the stope is at the state of filling, the optimization sequence should be roof thickness, rib pillar width, stope span, and rib pillar height. The combination of theoretical derivation and numerical simulation is applied in the supporting project to verify the correctness of theoretical derivation.

关 键 词：采矿工程 充填 突变理论 顶板 间柱 采场稳定性 

分 类 号：TD313[矿业工程—矿井建设]