缓倾斜薄矿体开采空区群精确数字化及稳定性分析

Accurate Digitization and Stability Analysis of Cavity Group of Gently Inclined Thin Orebody

为分析缓倾斜薄矿体回采形成的大量空区的稳定性,根据空区位置和开采现状,采用激光3D扫描进行空区数字化,建立精确的空区群三维形态模型和数值计算模型。对建立的空区群数值模型进行计算,按照下行式和前进式的回采顺序逐步模拟形成空区群,得到了次生应力平衡之后的最大主应力云图、最小主应力云图、位移云图。数值模拟结果表明矿柱尺寸对采空区群的稳定性影响很大,矿柱靠近顶板的位置为应力集中部位,给空区群模型留设合理尺寸的矿柱时,顶板和矿柱内的位移趋于定值,处于稳定状态。按照现有空区群内留设10 m×6 m间柱的情况下,经过数值模拟分析,空区群表现为稳定状态。

To analyze the stability of a large number of goafs formed by gently inclined thin orebody mining,according to the goaf location and mining status,laser 3D scanning was used to digitize the goaf,and accurate 3D shape model and nu⁃merical calculation model of goaf group were established.The numerical model of goaf group is calculated,and the goaf group is simulated step by step according to the descending and advancing mining sequence.The maximum principal stress nephogram,minimum principal stress nephogram and displacement nephogram are obtained after the secondary stress is bal⁃anced.The numerical simulation results show that the pillar size has a great influence on the stability of goaf group.The posi⁃tion of pillar close to the roof is the stress concentration position.When a reasonable size pillar is reserved for the goaf group model,the displacement of the roof and pillar tends to a fixed value and is in a stable state.According to the existing goaf group with 10 m×6 m column,through numerical simulation analysis,the goaf group is stable.