Study On Long-Term Stability Of Buried Deep Thenardite Solution Mining Cavity

In recent years, with the importance of mineral salts as industrial raw materials andthe need for salt deposit mining caverns as energy storage areas, that the substaces suchas oil, natural gas, nuclear waste and so on, salt caverns solution mining and stablestudy more and more in-depth. Thenardite as main extract of the sodium sulfate depositsis widely distributed in the modern salt lake deposits and ancient salt deposits, which isone of the most widely distributed minerals in the mineral salts. This paper rely onconcave mining area of JiangSu HongZe ZhaoJi as project, with the methods of thetheoretical analysis, laboratory tests and numerical simulation, systematic in-depthresearch on caverns long-term stability of buried deep thenardite deposit solutionmining. The main research work and achievements:â‘ Comprehensive analysis of research results, analysis of the short-term andlong-term influencing factors about stability of thenardite solution mining, to get thatthe creep characteristics of the thenardite is one of the important parameters oflong-term stability.â‘¡By analyzing the indoor creep triaxial test relying on the works of thenardite,roof and floor mudstone and the upper rock salt, we get creep properties about thesethree rock. Based on this, we choose Burgers model to describe the rock creepcharacteristics and get the parameters of the model based on Burgers by using the leastsquare method to fit the experimental data.â‘¢Establish a single caverns three-dimensional numerical calculation model byusing FLAC3Dsoftware to according to the rock of the project. Combination of testparameters of rock to analysis of the salt cavity stability and overburden movement lawin different rheological time, saturated brine pressure, span and other influencingfactors.â‘£Establish double caverns and pairs of caverns connected three-dimensionalnumerical calculation model by using FLAC3Dsoftware to analysis of the salt cavitystability and overburden movement law in different span and spacing. And then, we getreasonable span and spacing to provide the basis for the safety and economic analysis ofengineering.