缓倾斜厚大矿体崩落法开采对临近构筑物的影响

Influence of the Caving Mining of the Gently Inclined Heavy Ore on Adjacent Structures

采用三维仿真计算技术对复杂条件金属矿山缓倾斜厚大矿体崩落法开采诱发的岩层移动对临近区域地表构筑物的影响进行研究,对于有效地解决复杂条件金属矿山开采诱发地表沉陷的测算问题具有重要意义。以程潮铁矿无底柱分段崩落法开发为背景,通过构建涵盖矿体、围岩体分布、采掘工艺、初始应力条件等信息的高精度三维空间模型,采用莫尔-库伦本构模型,依据岩体力学试验确定的模型力学参数,严格依据矿山开采顺序,模拟计算了多因素联合作用下不同开采阶段地下开采岩层移动规律,并对未来深部开采对矿山地表工业构筑物的影响程度进行了预测。结果表明:程潮铁矿措施井所在位置的地表移动角在开采-500 m水平时约为50°,-375 m水平开采后将会对措施井的稳定性产生显著的影响。

This paper applies three-dimensional simulation calculation technology to studying strata movement influence induced by caving mining of heavy ore in metal mines with complex conditions on the surface structures in the adjacent areas,which is of great significance to effectively solve the calculation problem of surface subsidence induced by metal mining under complex conditions.Based on the development of sublevel caving method without sill pillar in Chengchao iron mine,the paper constructs a high-precision three-dimensional model covering three-dimensional spatial model of ore,distribution of surrounding rock mass,mining technology,initial stress conditions and other information.The paper adopts Mohr-Coulomb model in the simulation calculation and determines the mechanical parameters of the model by experiments.The paper also strictly calculates the rock strata movement law in different mining stages according to the mining sequence and predicts the influence degree of deep mining on the surface industrial structure of the mine in the future.The results show that the surface movement angle of the location of the measure well in Chengchao iron mine is about 50°.-375 m horizontal mining will have a significant impact on the stability of the measure well.