真空-电渗联合作用下的软基固结计算研究

考虑了电渗水流与压力水流的叠加作用及井阻对真空度衰减的影响,在此基础上结合Hansbo砂井地基固结理论和真空-电渗边界条件,建立了轴对称真空-电渗联合作用软基固结方程,给出了地基中平均孔压和径向固结度的解析解,并进行了退化验证。最后通过算例分析,研究了不同荷载组合情况对平均孔压消散和径向固结度的影响。结果表明:真空-电渗联合作用下平均孔压是真空预压与电渗分别作用下孔压的叠加;在真空度不足情况下,可通过调节电渗电压大小,保证土体加固效果;在真空度一定的情况下,电源电压越大加固效果越好。

Solutions for consolidation of soft ground under vacuum preloading combined with electro-osmosis

An axisymmetric analytical consolidation theory of soft ground under vacuum preloading combined with electro-osmosis is established by considering superposition of electric water seepage flow and pressure flow,the impact on vacuum loss induced by well resistance,the Hansbo’s sand drain foundation consolidation theory and vacuum combined with electro-osmosis boundary conditions.The analytical solutions for average excess pore pressure and radial average degree of consolidation are provided and varied.Finally,the effect of different load combinations on average excess pore pressure and radial average degree of consolidation is investigated by analysis of examples.The results show that the average excess pore pressure under vacuum preloading combined with electro-osmosis is the superposition of vacuum preloading and electro-osmosis respectively,the effect of soil reinforcement can be ensured through adjusting the voltage when the vacuum is insufficient,the better consolidation effect can be gained by higher supply voltage in the case of certain vacuum.