湘潭某大型锰矿矿区地面塌陷成因及危险性评估与防治策略

    Causes, risk assessment and prevention strategies of ground collapse in a large manganese mine in Xiangtan

    • 摘要: 为探究矿区地面塌陷灾害精准防治,以湘潭锰矿区为研究对象,收集了研究区地质环境、水文地质及工程地质资料,分析了地面塌陷地质灾害的发育特征、影响因素及成因机理。根据岩溶塌陷主控因素(地层岩性、构造、覆盖层厚度、结构和性质、水动力条件)及采空塌陷主控因素(矿层埋藏条件、采矿方法与开采程度、地下水、断层),分别建立了易发性和危险性评价的因子矩阵,对岩溶塌陷及采空塌陷地质灾害进行了易发性和危险性评价,针对性提出了防治措施。结果表明: 研究区存在3个岩溶塌陷危险性大区,需对该区地下岩溶区进行地面填堵裂缝和塌陷洞、注浆充填地下岩溶区等处理方式; 研究区存在8个采空塌陷危险性大区,需减少区内抽、排水量,控制水位升降,必要时进行围幕灌浆或回填、充水。研究结果可为湘潭锰矿区地面塌陷的防治提供参考,也可为其他地区地面塌陷危险性评价提供借鉴。

       

      Abstract: To investigate the precise prevention and control measures for ground collapse in mining areas, the authors in this study selected Xiangtan Manganese mining area as the study object. Geological environmental, hydrogeological, and engineering geological data for the study area were collected to analyze the developmental characteristics, influencing factors, and genetic mechanisms of ground collapse. The factor matrices for susceptibility and risk assessments were established, according to the main control factors of karst collapse (stratigraphic lithology, structure, overburden thickness, configuration and properties, hydrodynamic conditions) and the main control factors of goaf collapse (seam burial conditions, mining methods and mining degree, groundwater, faults). And susceptibility and risk assessments for karst collapse and goaf collapse were conducted, and targeted prevention and control measures were proposed. The results show that the study area contains 3 high risk areas of karst collapse, which can be treated by ground filling for cracks and collapse holes, grouting and filling of underground karst regions. Additionally, there are 8 high risk areas of goaf collapse that require reducing pumping and drainage volumes, managing water level fluctuations, and implementing curtain grouting or backfilling and water filling if necessary. The research results could provide references for the prevention and control of ground collapse in Xiangtan Manganese mining area, serving as a guide for risk assessment of ground collapse in other areas.

       

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