云应盐矿区地面塌陷地质模型及变形破坏表现形式研究

Study on Geological Model of Ground Collapse and Forms of Deformation and Failure in Yunying Salt Mining Area

云应盐矿区因特殊的覆盖层地质结构和盐矿开采活动,频发塌陷等地质灾害。总结云应盐矿区覆盖层的地质结构类型,分析不同地质结构覆盖层的塌陷表现形式,建立塌陷地质模型。研究表明,云应盐矿区主要发育半固结粘土岩型、半固结粘土岩与半固结砂砾岩等厚互层型、半固结砂砾岩型3种覆盖层地质结构;上述3种覆盖层中塌陷的发育机理分别为冲蚀效应+潜蚀效应+遇水软化+失托增荷效应+真空负压效应+动水压力,冲蚀效应+潜蚀效应+动水压力+遇水软化+失托增荷效应+真空负压效应,冲蚀效应+潜蚀效应+动水压力+失托增荷效应。该研究可为盐矿区地质灾害预警和防治提供科学的地质依据。

Due to the special overburden geological structure and salt mining activities,Yunying salt mining area has frequent geological disasters such as collapse.The paper summarizes the geological structure types of overburden in Yunying salt mining area and analyses the forms of deformation and failure with different geological structures,and then establishes the collapse geological model.The research shows that Yunying salt mining area mainly develops three kinds of overburden geological structures:semi-consolidated tonstein type,semi-consolidated tonstein and semi-consolidated glutenite equal-thickness interbedded type and semi-consolidated glutenite type.The mechanism of collapse development in the above three types of overburden are:erosion effect+submersible effect+water softening+unloading effect+vacuum negative pressure effect+hydrodynamic pressure,erosion effect+submersible effect+hydrodynamic pressure+water softening+unloading effect+vacuum negative pressure effect,erosion effect+submersible effect+hydrodynamic pressure+unloading effect.The study can provide scientific geological basis for early warning and prevention of geological disasters in salt mining area.