Settlement-controlling and pressure-reduction effect of pervious concrete pile under the action of embankment load
Settlement-controlling and pressure-reduction effect of pervious concrete pile under the action of embankment load
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发表时间：
2013
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通讯作者：
N. Zhang
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作者：
N. Zhang
透水混凝土桩既具有刚性桩的强度高，又具有碎石桩的渗透性大的优点，适合于地基加固，为了研究透水混凝土桩的控沉减压效果，基于有限元法和毕奥固结理论，通过对超静孔隙水压力、桩土应力比、桩周土体应力比、桩周土体应力比、桩研究了路堤荷载作用下透水混凝土桩复合地基的水平位移和沉降，通过与碎石桩复合地基和素混凝土桩复合地基的对比分析，发现透水混凝土桩复合地基中的超静孔隙水压力是由路堤荷载引起的，消散快，结果表明，透水混凝土桩具有显著的减压效果，且透水混凝土桩复合地基的水平位移和工后沉降最小，说明透水混凝土桩能明显减小地基沉降，因此，透水混凝土桩特别适用于透水性差、工后沉降大的地基加固。
With the advantages of both high strength of rigid pile and large permeability of granular pile,pervious concrete pile was suitable for reinforcing foundation.In order to study the settlement-controlling and pressure-reduction effect,based on finite element method and Biot's consolidation theory,the excess pore water pressure,pile-soil stress ratio,horizontal displacement and settlement of pervious concrete pile composite foundation under the loading of embankment were studied,and compared with those of gravel pile composite foundation and plain concrete pile composite foundation.It was found that the excess pore water pressure in the pervious concrete pile composite foundation was induced by the loading of embankment dissipated quickly,which showed that the pervious concrete pile had significant pressure-reduction effect.Furthermore,the pervious concrete pile composite foundation had the minimum horizontal displacement and post-construction settlement,which proved that the pervious concrete pile could evidently reduce the settlement of foundation.Therefore,the pervious concrete pile was particularly suitable for reinforcing foundation with poor water permeability and large post-construction settlement.