Study On Mechanical Properties Of Glauber's Salt And Stability Of Solution Mining Cavity

Water-soluble mining method has been widely used for salt deposits mining in recent years. Compared with conventional mining methods, water-soluble mining has many advantages, such as increasing the mining depth, expanding the recoverable reserves, improving the working conditions, increasing our labor productivity, reducing the environmental pollution and so on. As the growing global energy crisis, water-soluble mining in cavity is also more and more used for the underground storage of national strategies energy. This set of views, which relies on Jiangsu Hongze Zhao Ji Glauber's salt mining project, is studying the stability of Glauber's water-soluble mining in cavity by making the physical and mechanical properties experiments and the numerical simulation. The specific researching is as follows:â‘ Describe the basic principle of water-soluble mining on the synthesis of domestic and foreign research. Summary the reasons which affect the stability of underground caverns and salt cavern and select a few specific factors that affect the stability to conduct the numerical simulation.â‘¡Get the original rock samples, which are located at the seam and the concave roof and floor, for tensile, uniaxial compression and triaxial compression tests to obtain Glauber's salt and its roof and floor parameters of physical and mechanical properties of rocks from Jiangsu Hongze Zhao Glauber's salt mining area. And this provides the basis for selection of the following the numerical analysis and calculation parameters of the rock constitutive model.â‘¢According to the actual geological mining conditions, combined with tests of the physical and mechanical parameters ,we make use of the ANSYS program to establish a single Glauber's salt cavern numerical model ,which is for the purpose of the three-dimensional numerical simulation of the stability of cavity while the Glauber's water-soluble mining.We simulate Glauber's salt caverns which use the Water-soluble mining method under different Cross-height ratio, different water pressure, different lateral pressure coefficients. We sum up the law of factors which affect the overall stability of caverns by coMParing the changes in various conditions, the displacement, stress and the plastic zone changes of surrounding rock caverns.â‘£Also we established two-cavern model for the research of the reasonable distance of the double Glauber's salt solution mining caverns. We obtain the reasonable cavern spacing relying engineering by coMParing all factors which affect the stability of surrounding rock and pillar under different spacings caverns after excavation. Combined with the changes of inside pressure, what we get in the meanwhile is that increasing the water pressure is good for the overall stability of double dissolved cavity. This provides a way to try, which could not only increase the recovery ratio of greater Glauber's salt but also reduce the cavern spacing while ensuring the safety of caverns.