复杂环境下的空区顶板岩层移动破坏响应特征研究

Study on Movement and Destruction Response Characteristics of Goaf Roof Rock under the Complex Environment

为了使赋存于构造应力及河床等复杂环境下的某萤石矿矿体能被安全回采,依据矿山设计总体框架,研究采用现场监测和数值计算手段,分别分析了干式充填和灰砂比1∶4胶结充填采矿作业对空区顶板覆岩移动破坏的响应特征。研究结果表明灰砂比1∶4胶结充填采矿工艺能有效控制空区顶板覆岩移动破坏;干式充填采矿在空区顶板覆岩产出的下沉变形值、主应力差值及塑性破坏区等破坏特征值明显偏大,且采空区顶板覆岩遭受多次剪切破坏,裂隙带与河床贯通,不能保证矿山的安全顺利生产。

For safety mining orebody under the complex environment of tectonic stress and river plate, according to mine design framework, the site monitoring and numerical method were used to study movement and destruction response characteristics of goal roof rock, which is filled in the ways of dry stowing and gray sand ratio 1 ： 4 cementation. The results show that comparing the effectiveness of controlling the goaf roof rock to move and destroy with the gray sand ratio 1 ： 4 ce- mented filling mining process, the damage characteristic values that are caused by dry-fill mining process, such as sinking deformation value, principal stress difference, plastic zone and so on are significantly larger, and the goal roof rock suffered shear failure many times, the fracture zones run through the river plate, so it cant ensure the mine produce safely and successfully.