二步采场回采下的一步采空区稳定性分析

随着大直径深孔采矿法的推广应用，空区失稳坍塌问题凸显，加强采空区管理，开展开采过程中的采空区稳定性分析十分必要。本文采用目前先进的BLSS-PE矿用三维激光扫描系统辅助建立了某矿山生产中段采空区数值计算模型，结合应力与位移分布云图，得出二步采场回采对一步采场空区稳定性的影响大小，结果表明，二步采场回采使得一步采空区周围的应力集中范围进一步扩大并与一步采空区形成了应力叠加，在矿柱位置出现了应力集中，最大集中应力约为26 MPa，且垂直方向上的位移增加，最大位移量接近5 mm，存在顶板垮塌风险。

Stability Analysis of First-step Goaf under the Second-step Mining Recovery

With the application of large diameter deep hole mining method, the problem of caving and collapse becomes prominent. Therefore, it is necessary to strengthen goaf management and carry out goaf stability analysis during mining. In this paper, the numerical calculation model of goaf is established with the advanced BlSS-PE mine 3D laser scanning system, combined with the stress and displacement distribution cloud, the influence of two-step stope recovery on the stability of one-step goaf is obtained, the results show that the stress concentration range around the one-step goaf is further enlarged and stress superposition is formed by two-step stope recovery, at the same time, stress concentration appears at the pillar position, the maximum stress concentration is about 26 MPa, and the vertical displacement increases, the maximum displacement is close to 5 mm, there is a risk of roof collapse.