桩—网复合地基加宽路基的数值模拟分析
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摘要
应用PLAXIS非线性有限元软件,模拟了桩—网复合地基加宽路基的施工及加载过程,对加宽后路基的竖向位移、水平位移、应力及桩体应力进行了分析计算,分析结果证明桩—网复合地基很好地减小了路面的不均匀沉降及路基的水平变形,还有效地分散了路基填土荷载,增加了加宽路基的稳定性,得出格栅加筋层数的增加并不能很好地减小土体的水平位移,即采用一层格栅加桩基处理较为合适。
Using PLAXIS nonlinear finite element software,this paper makes a simulation research on the construction and loading process to roadbed widened of pile composite foundation.In it the vertical displacement,horizontal displacement of thewidened roadbed,and the stress and the pile body is analyzed and calculated.The results show that the pile composite foundation is very good to reduce the uneven settlement and the horizontal change of the roadbed,to effectively disperse the loads of subgrade soil,and to increase the stability of widened roadbed.It also concludes that the increases of grille reinforced geogrid layers can not decrease the horizontal displacement of soil very well,so the adoption of a layer of grille with pile foundation treatment is relatively appropriate.
Using PLAXIS nonlinear finite element software,this paper makes a simulation research on the construction and loading process to roadbed widened of pile composite foundation.In it the vertical displacement,horizontal displacement of thewidened roadbed,and the stress and the pile body is analyzed and calculated.The results show that the pile composite foundation is very good to reduce the uneven settlement and the horizontal change of the roadbed,to effectively disperse the loads of subgrade soil,and to increase the stability of widened roadbed.It also concludes that the increases of grille reinforced geogrid layers can not decrease the horizontal displacement of soil very well,so the adoption of a layer of grille with pile foundation treatment is relatively appropriate.
引文
[1]饶为国,赵成刚.桩—网复合地基应力比分析与计算[J].土木工程学报,2002,35(2):74-80.
[2]饶为国.桩—网新工法加固软土路基理论与技术[D].北京:中国地震局地球物理研究所,2005:23-27.
[3]饶为国,江辉煌,侯庆华.桩—网复合地基工后沉降的薄板理论解[J].水利学报,2002,33(4):23-27.
[4]饶为国.桩网复合地基原理及实践[M].北京:中国水利水电出版社,2004:30-40.
[5]Han J,Akins K.Use of geogrid-reinforce and pile-supported earth structures[A].Proceeding of Interna-tional Deep Foundation Congress[C].Orlando:NationalScience Foundation,2002:668-679.
[2]饶为国.桩—网新工法加固软土路基理论与技术[D].北京:中国地震局地球物理研究所,2005:23-27.
[3]饶为国,江辉煌,侯庆华.桩—网复合地基工后沉降的薄板理论解[J].水利学报,2002,33(4):23-27.
[4]饶为国.桩网复合地基原理及实践[M].北京:中国水利水电出版社,2004:30-40.
[5]Han J,Akins K.Use of geogrid-reinforce and pile-supported earth structures[A].Proceeding of Interna-tional Deep Foundation Congress[C].Orlando:NationalScience Foundation,2002:668-679.
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