CFG桩网复合地基在深厚软弱地基中的研究与应用
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摘要
南桂公路K158+500～K180+000段为深厚软弱地基,利用CFG桩网复合地基对软土地基进行处理。通过计算初步确定了CFG桩网复合地基的主要技术参数,基于有限元软件ABAQUS对荷载作用下复合地基的沉降值、水平位移及桩身应力规律进行研究,并从不同的桩长、桩间距及边桩长度等角度进行了仿真计算。最终得出本文推荐的CFG桩网复合地基主要计算参数:桩径为40 cm,桩间距为160 cm,路基中心线附近桩长为8. 5 m,边桩长度为7. 5 m。
The K158 + 500 ～ K180 + 000 section of Nangui Highway is a deep and weak foundation. This paper uses CFG pile-net composite foundation to treat soft soil foundation. The main calculation parameters of CFG pile-net composite foundation were preliminarily determined. Based on the finite element software ABAQUS,the settlement value,horizontal displacement and pile stress law of composite foundation under load were studied,and the pile length and pile spacing were different. The simulation calculation is carried out at the same angle as the length of the side pile. Finally,the main calculation parameters of the recommended CFG pile-net composite foundation are obtained: the pile diameter is 40 cm,the pile spacing is 160 cm,the pile length is 8. 5 m near the centerline of the subgrade,and the length of the side pile is 7. 5 m.
The K158 + 500 ～ K180 + 000 section of Nangui Highway is a deep and weak foundation. This paper uses CFG pile-net composite foundation to treat soft soil foundation. The main calculation parameters of CFG pile-net composite foundation were preliminarily determined. Based on the finite element software ABAQUS,the settlement value,horizontal displacement and pile stress law of composite foundation under load were studied,and the pile length and pile spacing were different. The simulation calculation is carried out at the same angle as the length of the side pile. Finally,the main calculation parameters of the recommended CFG pile-net composite foundation are obtained: the pile diameter is 40 cm,the pile spacing is 160 cm,the pile length is 8. 5 m near the centerline of the subgrade,and the length of the side pile is 7. 5 m.
引文
[1]宋远明,吴伟国,邓爽.水分迁移引起红粘土路基软化及病害预防研究[J].公路工程,2013,38(1):40-43.
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[10]付强,刘汉龙,庄妍,等.高速铁路CFG桩筏复合地基沉降变形特性研究[J].铁道科学与工程学报,2014(6):45-51.
[11] Xing-Wang X U. Engineering practice and research on the high speed railway composite foundation with CFG pile+compaction pile[J]. Journal of Railway Engineering Society,2016.
[12]何桥敏,胡卫国.考虑桩土界面摩阻力的CFG桩复合地基沉降计算方法[J].武汉理工大学学报(交通科学与工程版),2016,40(3):482-485.
[13] Zhao M,Liu M,Ma B,et al. Calculation of pile-soil stress ratio and settlement of pile-net composite foundation based on elastic foundation plate[J]. Journal of Central South University,2016.
[14]罗刚.路堤荷载作用下CFG桩复合地基加固区沉降计算方法分析与应用研究[J].公路工程,2016,41(6):43-47.
[15] Zhang J,Cui X,Huang D,et al. Numerical simulation of consolidation settlement of pervious concrete pile composite foundation under road embankment[J]. International Journal of Geomechanics,2016,16(1):B4015006.
[2]姜忠,付明,袁俊年,等.珠海海堤淤泥质软土地基处理方案实例解析及效果评价[J].水利水电技术,2016,47(7):42-46.
[3] Kim T H,Kim T H,Kang G C. Performance evaluation of road embankment constructed using lightweight soils on an unimproved soft soil layer[J]. Engineering Geology,2013,160(13):34-43.
[4] ZUO D J,QI C G,ZHANG Y T,等.塑料套管混凝土桩加固公路软土地基现场试验研究[J].岩土工程学报,2013,35(9):1746-1752.
[5]王向会,白志军,朱建民.膨胀加固土桩的膨胀增载机理与数值分析[J].公路,2014(10):75-78.
[6]轩勇,刘军勇.粒料桩复合地基桩土应力比试验研究[J].路基工程,2013(2):94-97.
[7]尹湃,黄作俊,袁小林.真空堆载预压法控制高速公路软土地基沉降的现场监测试验分析[J].岩土工程技术,2013,27(1):9-12.
[8]许健.软土地基环境下的公路工程施工处理[J].公路工程,2017,42(5):197-201.
[9]朱小军,费康,李文帅,等.沉箱-垫层-桩复合基础竖向特性的细观试验[J].中国公路学报,2017,30(10):93-99.
[10]付强,刘汉龙,庄妍,等.高速铁路CFG桩筏复合地基沉降变形特性研究[J].铁道科学与工程学报,2014(6):45-51.
[11] Xing-Wang X U. Engineering practice and research on the high speed railway composite foundation with CFG pile+compaction pile[J]. Journal of Railway Engineering Society,2016.
[12]何桥敏,胡卫国.考虑桩土界面摩阻力的CFG桩复合地基沉降计算方法[J].武汉理工大学学报(交通科学与工程版),2016,40(3):482-485.
[13] Zhao M,Liu M,Ma B,et al. Calculation of pile-soil stress ratio and settlement of pile-net composite foundation based on elastic foundation plate[J]. Journal of Central South University,2016.
[14]罗刚.路堤荷载作用下CFG桩复合地基加固区沉降计算方法分析与应用研究[J].公路工程,2016,41(6):43-47.
[15] Zhang J,Cui X,Huang D,et al. Numerical simulation of consolidation settlement of pervious concrete pile composite foundation under road embankment[J]. International Journal of Geomechanics,2016,16(1):B4015006.