为了最大限度地开采地下资源并保证地表建构筑物的安全,运用MIDAS/GTS(岩土与隧道分析系统)建立三维模型,对新桥矿露天转地下开采诱发的地表沉降和移动进行数值模拟研究。结果表明,露天转地下开采影响范围内最大变形值：地表倾斜i、曲率K及水平变形ε最大值分别为0.640mm/m、0.012×10^-3/m和0.503mm/m,低于工程范围内建(构)筑物保护等级对应的允许变形值,露天转地下开采不会诱发危及民居等地面建(构)筑物稳定性的移动和变形,为矿山地表沉降预测和安全分析提供了理论依据。

In order to maximize mining the underground resources and ensure the safety of the buildings and structures located in ground, the ground subsidence and movement induced by transition from open pit to underground mining of Xinqiao Mine was studied based on a three-dimensional model established by MIDAS/GTS. Analyse results showed that the largest value of surface tilt (i), curvature (K) and horizontal deformation (ε) are 0.640mm/m, 0.012×10^-3/m and 0.503mm/m, which lower than the structures and buildings objects protection level and the allowable deformation value corresponding. The ground subsidence and movement induced by transition from open pit to underground mining will don't endanger the buildings and structures located in ground, which provide a theoretical basis for prediction and safety analysis of Xinqiao Mine's ground subsidence.