【摘要】 基于分段线性差分法,建立轴对称真空预压–电渗耦合非线性大变形固结模型,可用于分析真空预压、电渗任意组合形式下的软黏土大变形固结问题。模型充分考虑固结过程中土性参数的非线性变化并采用FORTRAN编写计算程序,分别采用小变形解析解和大变形固结试验验证模型的准确性,模型在小变形情况下与现有解析解吻合,大变形情况下与室内试验实测值接近。开展真空预压与电渗不同组合形式下的工况分析,结果表明:真空预压–电渗联合作用的固结效果优于单一工法;不同真空预压与电渗组合形式下,土体最终平均沉降量接近,电渗滞后工况对降低能耗效果最好;为进一步降低能耗,工程中应将真空预压–电渗组合工况的固结度控制在80%以内。更多还原

【Abstract】 Based on the piecewise linear difference method,a new model of simulating the large strain consolidation of soft clay under the combination of electroomosis and vacuum preloading was developed. The model considers soil nonlinearity and was implemented using FORTRAN. The model was validated by the small strain analytical approach and large strain experiment. The modelling results agree with the analytical solutions and the experimental results. A parametric study was conducted to examine the effects of different combinations of vacuum preloading and electroosmosis. The results show that the combined method outperformed the single-process method. The final average settlements of the soil under varied combinations of vacuum preloading and electroosmosis are approximate. The process of applying the electric field after the surcharge preloading can reduce energy consumption. Further energy reduction can be obtained by confining the degree of consolidation within 80%.更多还原