王海,杨朝晖,李文强,王汉斌

• 1:山西省交通规划勘察设计院有限公司
• 2:山西省采空区公路桥梁隧道工程处治工程技术研究中心
• 3:中国地质大学(北京)工程技术学院

摘要(Abstract)：

急倾斜煤层开采后岩层移动及地表沉陷规律较为复杂，而且多煤层开采诱发重复采动会加剧地表变形，但是目前急倾斜多煤层开采岩层移动规律和地表变形特征的研究并不充分，深入研究急倾斜多煤层开采引起的岩层移动及地表变形规律，对煤矿安全生产和地表建筑物稳定性评价具有重要意义。以淮南矿区八里塘东三采区为研究背景，采用3DEC数值模拟软件对急倾斜多煤层深部开采岩层移动及地表变形进行了数值计算分析，得到了急倾斜多煤层开采覆岩移动规律及地表变形特征。计算结果发现：急倾斜煤层开采岩层移动形式可分为顶板岩层的压弯变形、沿弱面的滑移运动以及覆岩直接垮落；急倾斜煤层开采之后，采空区深部岩体运动趋势缓于较上部岩体运动，覆岩主要变形位置在采空区中部，变形方向沿煤层顶板法线方向指向采空区；急倾斜多煤层开采会导致地表松散层变形剧烈，地表下沉曲线及地表倾斜曲线呈现明显的非对称性，且煤层顶板侧地表变形影响范围大于煤层底板侧地表影响范围。根据计算结果，该区域开采后地表最大位移量可达40.625m,地面下沉曲线中没有平底部分，只存在单一最大下沉点，最大下沉点南侧最大倾斜值1.26m/m,北侧最大倾斜值为-0.74m/m,地表倾斜变形曲线呈现以最大下沉点为中心的反对称形态。该研究成果可为八里塘采区类似急倾斜煤层开采研究提供理论依据与技术参考。

关键词(KeyWords)： 急倾斜多煤层;岩层移动;地表变形;离散元方法

Abstract:

Keywords:

基金项目(Foundation): 山西交科集团2020年度创新发展项目(20-JKCF-42)

作者(Author): 王海,杨朝晖,李文强,王汉斌

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