Abstract: The?non-linear?elastic?constitutive?relation?（?Duncan-Zhang?model）?is?applied?to?the?finite?element?procedure?based?on?Biot?consolidation?theory.?The?sand?drain?subgrade?is?taken?as?the?sand?wall,?and?the?loading?process?by?classifying?in?the?actual?construction?is?simulated.?The?consolidation?settlement?and?the?rule?of?ultra-static?dissipation?of?pore?pressure?in?the?sand?drain?ground?are?studied?by?the?plane?finite?element.?Compared?with?the?measured?results,?it?is?showed?that?the?plane?finite?element?method?can?predict?the?consolidation?settlement?of?sand?drain?subgrade?accurately,?and?can?simulate?the?consolidation?settlement?in?the?loading?process?by?classifying?and?gain?the?rule?of?ultra-static?dissipation?effectively.?This?method?is?of?high?application?value?to?determine?the?embankment?construction?on?soft?ground?and?the?time?of?pavement.

Key words: sand drain subgrade ;plane FEM , Duncan-Zhang model ;consolidation settlement ;

摘要： 将非线性弹性本构关系(邓肯-张模型)引入Biot固结理论有限元程序,把砂井地基等效为砂墙,并模拟实际 施工中分级加载过程,采用平面应变有限元方法对其固结沉降与超静孔隙水压力消散的规律进行研究。与实测结 果的对比表明,平面有限元方法可较准确的预测沙井地基的固结沉降,并能有效模拟分级加载过程中地基沉降与 超静孔隙水压力消散的规律。该方法对确定软土地基上的路堤施工进度和路面铺设时间都具有较高的应用价值。

关键词: 沙井地基, 平面有限元, 邓肯-张模型, 固结沉降