School of Energy Science and Engineering, Henan Polytechnic University
State Collaborative Innovative Center of Coal Work Safety and Clean-efficiency Utilization

弱胶结地层重复采动条件下的地表沉降特征对西部弱胶结矿区煤炭资源安全高效开采与生态修复具有十分重要的意义。采用理论分析、相似模拟、数值模拟及现场监测等方法，对弱胶结地层矿区重复采动条件下的覆岩运移规律及地表沉降模型进行了研究，并进行了工程应用。通过理论分析探讨了弱胶结岩石的碎胀性特征及重复采动覆岩运移对地表沉降的影响机制，建立了“弱胶结地层重复采动条件下地表最大沉降模型”，其中弱胶结岩石的碎胀系数、下层煤的采厚均与弱胶结地层重复采动地表最大下沉值之间呈线性关系。通过相似模拟、数值模拟分析了弱胶结地层重复采动覆岩与地表沉降特征。研究结果表明：弱胶结地层初次采动和重复采动覆岩离层高度发育规律基本一致，均呈现阶梯状上升；重复采动地表下沉曲线呈非对称性分布，最大下沉值偏于开切眼侧的规律；并给出了初次采动和重复采动后的覆岩最高发育高度、地表最大下沉值和地表下沉系数。采用已建立的地表最大沉降模型对现场地表最大下沉值进行预测，地表最大沉降模型预计值与工作面回采过程中现场实测值相近，验证了“弱胶结地层重复采动条件下地表最大沉降模型”的合理性，同时工作面回采结束后的地表最大下沉预计值可为现场实际工作提供参考依据。

The characteristics of surface subsidence under the condition of repeated mining in weakly cemented strata are of great significance to the safe and efficient mining and ecological restoration of coal resources in weakly cemented mining areas in western China. Theoretical analysis, similar simulation, numerical simulation and field monitoring are used to study the migration law of overlying strata and surface subsidence model under repeated mining conditions in weakly cemented strata, and the model is applied in engineering. The bulking characteristics of weakly cemented rock and the influence mechanism of repeated mining overburden strata movement on surface subsidence are discussed through theoretical analysis. The ‘maximum surface subsidence model under the condition of repeated mining in weakly cemented strata’ is established. There is a linear relationship between the bulking coefficient of weakly cemented rock, the mining thickness of lower coal and the maximum surface subsidence of weakly cemented strata. Through similar simulation and numerical simulation, the characteristics of repeated mining overburden and surface subsidence in weakly cemented strata are analyzed. The research results show that the development law of the separation height of the initial mining and repeated mining of the weakly cemented strata is basically the same, and both show a step-like rise. The surface subsidence curve of repeated mining is asymmetrically distributed, and the maximum subsidence value is biased towards the side of open cut. The maximum development height of overlying strata, the maximum surface subsidence value and the surface subsidence coefficient after initial mining and repeated mining are given. The established maximum surface subsidence model is used to predict the maximum surface subsidence value on site. The predicted value of the maximum surface subsidence model is similar to the measured value on site during the mining process of the working face, which verifies the rationality of the ' maximum surface subsidence model under the condition of repeated mining of weakly cemented strata '. At the same time, the predicted value of the maximum surface subsidence after the mining of the working face can provide a reference for the actual work on site.

国家自然科学基金资助项目（U21A20108,52104127）；中原科技创新领军人才资助项目（224200510012）

郭文兵，韩明振，杨伟强，等. 弱胶结地层重复采动条件下地表最大沉降模型研究及应用[J]. 煤炭科学技术，2023，51（9）：1−10

GUO Wenbing，HAN Mingzhen，YANG Weiqiang，et al. Research and application of maximum surface subsidence model under the condition of repeated mining in weakly cemented strata[J]. Coal Science and Technology，2023，51（9）：1−10