地表移动影响范围与地质采矿条件关系数值模拟

随着采空区增大，地质灾害不断增多，有必要对采动影响范围进行研究。10 mm下沉边界是确定影响范围的重要指标，且FLAC3D适合求解非线性大形变问题，因此可以将其用于探究地表移动影响范围(L)与地质采矿条件的关系。实验以某矿区A工作面和另一矿区B工作面为背景，通过建立数值模型，运用控制变量法探究了L与岩层厚度、松散层厚度、工作面开采尺寸、覆岩岩性的关系，给出了L的计算公式并对变化规律进行了理论与力学分析。结果表明：L与岩层厚度、松散层厚度呈正相关关系，L与采长呈负相关关系，L在关键层变软弱后显示出了轻微增长。研究为煤炭的合理开采及矿区地表建构筑物保护提供科学依据。

Numerical simulation of the relationship between the influence range of surface movement and geological mining conditions

With the increase of mined-out areas and geological disasters, it is necessary to study the influence range of mining. The 10 mm subsidence boundary is an important indicator to determine the influence range, and FLAC3D is suitable for solving the nonlinear large deformation problem. Therefore, it can be used to explore the relationship between the influence range of surface movement (L) and geological and mining conditions. Taking working faces A and B of two mines, through the establishment of numerical model, the relationship between L and bedrock thickness, loose layer thickness, working face mining length and overlying rock lithology was explored by using control variable method. The calculation formula of L was given and the variation law was analyzed theoretically and mechanically. The results show that L is positively correlated with bedrock thickness and loose layer thickness, while negatively correlated with the mining length. Similarly, L shows a slight increase after the key strata becomes weak. The study provides scientific basis for reasonable coal mining and protection of surface buildings in mining area.