| 陆泌锋,曾祥颖,黎江宏.高陡临空面附近地下采空区覆岩破坏响应研究[J].贵州地质,2023,40(2):153-158 |
| 高陡临空面附近地下采空区覆岩破坏响应研究 |
| Study on Failure Response of Overlying Rock in Underground Goaf near the High and Steep Free Face of Slope |
| 投稿时间：2023-02-24 |
| DOI： |
| 中文关键词: 高陡临空斜坡 煤层开采 地质灾害 离散元模拟 损伤变形特征 |
| 英文关键词:The slope with high and steep free face Seam mining Geological disasters Discrete element numerical simulation Damage and deformation characteristic |
| 基金项目:贵州省地矿局106地质大队科研项目资助(黔地矿106科合[2021]5号) |
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| 中文摘要: |
| 近年来，山区煤矿地下开采诱发地质灾害的问题日益突出。本文以贵州省兴仁市彭家洞高陡采动斜坡为原型，利用离散元数值模拟，研究煤矿开采对斜坡的影响，并分析该类斜坡的覆岩变形破坏特征及损伤规律。研究结果表明:高陡临空斜坡煤层地下开采引起覆岩下部产生的变形以垂直变形为主，且变形近似呈对称状分布，但在覆岩上部的斜坡陡崖部位，由于覆岩不完整，变形传递到该部位时会逐渐产生向临空面方向的水平位移；采空区覆岩损伤产生的裂纹主要为拉张裂缝，且裂纹在覆岩中近似呈“倒梯形”分布，在上山和下山方向的影响边界角分别为56°和68°；该类斜坡地下采空引起的覆岩损伤变形由下至上可分为三个带:冒落带、裂隙带和弯曲带。 |
| 英文摘要: |
| In recent years，the problems that geological disasters induced by underground mining of coal mines in mountainous areas have become increasingly prominent. In this paper，the high and steep mining slope in Pengjiadong，Xingren City，Guizhou Province is taken as the prototype，and the influence of coal mining on the slope is studied by using discrete element numerical simulation，and the overburden deformation，the failure characteristics and the damage law of this kind of slope are analyzed. The results show that the deformation in the lower part of the overburden caused by underground mining of coal seam on the slope with high and steep free face is mainly vertical，and the deformation is approximately symmetrically distributed. However，in the steep cliff part of the upper part of the overburden，due to the incomplete overburden，the deformation will gradually produce horizontal displacement in the direction of the open face when transferred to this part. The cracks caused by overburden damage in goaf are mainly tensile cracks，and the cracks are approximately distributed as “inverted trapezoid” in the overburden. The influence boundary angles are 56° and 68° in the uphill and downhill directions，respectively. The overburden damage deformation caused by underground mining-out in this kind of slope can be divided into three zones from bottom to top: collapse zone，fracture zone and bending zone. |
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