真空联合堆载预压加固软土地基的固结计算研究

Solutions to the Consolidation of Soft Ground with Vacuum-load Pre-loading

考虑真空度的衰减情况,在此基础上结合等应变砂井地基固结理论,对真空-堆载联合预压加固软基的固结计算进行了研究,推导了仅考虑径向渗流时的真空联合堆载预压下加固软土地基的固结解;通过算例分析,研究了真空度的衰减情况和砂井井径比等对平均孔压消散和径向固结度的影响。结果表明真空度的衰减情况对固结计算有较大的影响,真空度衰减得越少,加固效果越好;在外部荷载一定的情况下,井径比越小,加固效果越好。

Solutions to the consolidation calculation of soft ground with vacuum-load pre-loading were studied by considering the loss of vacuum on the basis of axisymmetric equal strain equation, analytic solutions to the consolidation of soft ground under vacuum- load pre-loading have been found when vertical water flow in soil is neglected. Through a numerical example, an analysis is made of the influence on the average pore pressure dissipation and radial degree of consolidation is made, considering loss of vacuum and the ratio of hole diameter. The results show that the loss of vacuum has a great effect on pore pressure and consolidation calculations, it would have a better reinforcing effect while the loss of vacuum is smaller. Under certain external conditions, the ratio of hole diame- ter is smaller, the better the reinforcement effect, this effect will be weakened with the extension of duration.