柔性隔离层作用下散体介质流理论研究

Based on the joint guidances from the concepts such as the green mining, none-waste mining, synergetic mining and so on, the applicant has creatively invented a new mining method "A non-top-pillar shrinkage stoping method with synchronization of final ore drawing and filling". It is the first time that traditional subsequent filling is advanced to synchronization filling from mining technology concept. The new method can also achieve the synergetic replacement use of cavity. Different from the drawing technology in traditional shrinkage method, the loose medium's flow law for the existing of the flexible isolation layer in new mining method makes a breakthrough over the traditional ore drawing theories, hence, it is very important to carry out the basic study on the project. The flow law of loose medium flow under the action of the flexible isolation layer and the deformation curve changing rule of the flexible isolation layer are analyzed by using the methods of the physical experiment, the numerical experiment and the orthogonal experiment; Combining with the flexible isolation layer interface space form, the stress characteristics of the flexible isolation layer interface and its failure conditions during the whole process of loose medium flow are studied; Loose medium stress-strain constitutive relationship is discussed on the basis of the theory of classical contact mechanics, so the internal mechanism of of the loose medium flow law under the action of isolation layer is revealed, thus a new flow field theory of loose medium under the action of flexible isolation layer is founded,which can promotes the development of ore drawing theory in metal deposits and the control theory of loose medium flow disaster.

基于绿色开采、无废开采和协同开采等理论的联合指导，申请人创新发明了大量放矿同步充填无顶柱留矿采矿法，首次从采矿技术理念上将传统的嗣后充填提前至同步充填，实现了采空区协同置换利用。区别于传统留矿法放矿工艺，新采矿法中散体介质因柔性隔离层的存在，其流动规律突破了现有放矿理论描述范围，因此，开展本项目研究具有重要理论意义。利用物理实验与数值试验手段及正交试验方法，分析隔离层作用下散体介质流动规律与柔性隔离层变形弯曲演化规律；结合柔性隔离层界面空间形态，分析柔性隔离层界面受力特性，研究散体介质流动全过程隔离层失效条件；基于经典接触力学理论，研究散体介质应力-应变本构关系，揭示隔离层作用下散体介质流动规律的内在发生机理，从而创建一套柔性隔离层作用下散体介质流理论，推动金属矿床放矿学理论及散体介质流动灾害控制理论的新发展。

基于绿色开采、无废开采和协同开采等理论的联合指导，申请人创新发明了大量放矿同步充填无顶柱留矿采矿法，首次从采矿技术理念上将传统的嗣后充填提前至同步充填，实现了采空区协同置换利用。区别于传统留矿法放矿工艺，新采矿法中散体介质因柔性隔离层的存在，其流动规律突破了现有放矿理论描述范围，因此，开展本项目研究具有重要理论意义。基于相似原理，对采场结构进行比例缩小，利用物理试验与数值模拟技术，构建同步充填留矿法室内试验模型；通过标记颗粒法，探究柔性隔离层作用下单漏口与多漏口放矿过程散体介质的流动规律；根据隔离层界面各区段受力特点，结合放矿过程隔离层界面拉力、压力、支持力与摩擦力特性，研究了单漏口与多漏口条件下隔离层的失效条件；以散体力学、弹性力学为指导，分析隔离层、放矿口及散体自重对矿石颗粒的附加应力；利用分力力学响应，表征矿石颗粒的运动规律，揭示隔离层作用下散体介质流动规律的内在发生机理；最终创建了一套柔性隔离层作用下散体介质流动理论，推动了金属矿床放矿学理论及散体介质流动灾害控制理论的新发展。