有机骨架材料充填地下溶洞的支护性能及稳定性分析

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

基于有机骨架材料的吸附作用,分析有机物质降低岩石矿物电解质的电导性质的作用机理,通过渗透试验、抗疲劳试验等验证了有机骨架材料良好的透水性能、抗疲劳性能、抗冲击性能及胶结泥化性能,在静载条件下对实际溶洞进行充填应用,验证了充填效果及材料性能,并建立仿真模型研究了下沉位移的变化规律。结果表明:有机复合材料能够使矿物元素活度系数变小,介电常数降低,与矿物颗粒结合后会形成稳定的晶格结构;有机骨架材料作为治理溶洞的充填材料,其结构性、耐久性都优于传统的充填材料,可满足岩溶地面塌陷治理工程中强度、稳定性与渗透性的材料要求,有效的提高了基础的抗沉降能力;实际充填施工过程中的数值分析与现场监测的位移变化规律与沉降趋势都具有较好的一致性,表明数值模拟的计算参数选取合理,得出的仿真变形规律可应用于指导工程施工。

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.