Analysis of support performance and stability of the underground karst cave filled with organic skeleton material

Based on the adsorption of organic skeleton material, we analyzed the mechanism of organic materials reducing the conductivity of rock mineral electrolytes. The good water permeability, fatigue resistance, impact resistance and cementation performance of the organic skeleton material are verified by penetration tests and anti-fatigue tests. Under the condition of static load, we made an actual cave filling application to verify the filling effect and material performance and obtain the variation law of subsidence displacement by establishing a simulation model. The results show that the organic composite material can reduce the activity coefficient of mineral elements, decrease the dielectric constant, and form stable lattice structure when combined with mineral particles. As the filling material for karst cave treatment, organic skeleton material is superior to the traditional filling material in terms of structure and durability, which can meet the material requirements of strength, stability and permeability in the karst ground collapse treatment project, and effectively improve anti-settlement ability of the foundation. The numerical analysis in site filling construction process is well consistent with displacement change law and settlement trend from field monitoring, which indicates that the calculation parameters of the numerical simulation are reasonable, and the simulation deformation law obtained can be applied to guide project construction.