基于主关键层位置的近浅埋煤层采动覆岩隔水层稳定性研究  

Stability research on the water-resistant strata under mining in nearly shallow coal seam based on location of main key stratum

作　　者：赵兵朝[1] 郭亚欣 孙浩 杨啸 王京滨 赵阳[1] ZHAO Bingchao;GUO Yaxin;SUN Hao;YANG Xiao;WANG Jingbin;ZHAO Yang(Energy College,Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an Universiy of Science and Technology,Xi'an,Shaanxi 710054,China)

机构地区：[1]西安科技大学能源学院,教育部西部矿井开采及灾害防治重点实验室,陕西西安710054

出　　处：《采矿与安全工程学报》2022年第4期653-662,共10页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51874230,52074208)。

摘　　要：为了构建近浅埋煤层采动覆岩隔水层稳定性评价模型,基于关键层和开采沉陷理论,采用理论分析、物理相似模拟试验和工程实例验证等研究手段,研究了主关键层分别位于“三带”或“两带”不同位置的近浅埋煤层采动覆岩隔水层稳定性。研究结果表明:以下沉系数作为判定参数,建立了主关键层分别位于采动覆岩“弯曲下沉带”、“裂缝带”和“冒落带”的判断准则。以岩层极限曲率和地表水平变形作为关键参数,分别给出了近浅埋煤层采动上行导水裂缝发育高度和下行导水裂缝发育深度的表达式。基于主关键层位置构建了近浅埋煤层采动覆岩隔水层稳定性评价模型。模型理论计算结果与工程实测结果相差4.1%和1.9%,与相似模拟试验结果相差2.8%和1.3%。In order to construct the stability evaluation model of water-resistant strata in the nearly shallow coal seam, based on the theory of key stratum and mining subsidence, this paper adopted theoretical analysis, analogical simulative experimentation, engineering example verification and other research methods to study the stability of water-resistant strata when the main key stratum is located in different positions of “three zones” or “two zones”. The judgment criteria was been established with the subsidence coefficient used as a judging parameter. The criteria is that the main key stratum is located in the “continuous deformation zone”, “fracture zone” and “caving zone” of the mining overburden. Taking the ultimate curvature of stratum and horizontal deformation of the surface as key parameters, the expressions of the development height of upward and downward water-conducting fractures in nearly shallow coal seams were given, respectively. Based on the position of the main key stratum, the stability evaluation model of water-resistant strata in nearly shallow coal seams was constructed. After verification, the theoretical calculation results of model differed by 4.1% and 1.9% from the actual one, and the difference between analogical simulative experimentation results by 2.8% and 1.3%.

关 键 词：覆岩隔水层 主关键层位置 极限曲率 水平变形 裂缝发育 稳定性评价模型 

分 类 号：TD167[矿业工程—矿山地质测量]