循环荷载下刚性桩对桩承加筋垫层复合地基承载性状影响

李天宝; 许家培; 刘开富

doi:10.13204/j.gyjzG20112307

循环荷载下刚性桩对桩承加筋垫层复合地基承载性状影响

doi: 10.13204/j.gyjzG20112307

1. 浙江广厦建设职业技术大学, 浙江东阳 322100;
2. 浙江理工大学建筑工程学院, 杭州 310018;
3. 临海市水务集团有限公司, 浙江临海 317000

基金项目:

浙江省自然科学基金项目(LY13E090010)。

国家自然科学基金项目(51678619)

详细信息

作者简介:
李天宝,男,1974年出生,硕士,副教授。

通讯作者:
刘开富,男,1977年出生,博士,副教授,liukaifu@zstu.edu.cn。

计量
- 文章访问数: 76
- HTML全文浏览量: 13
- PDF下载量: 5
- 被引次数: 0
出版历程
- 收稿日期: 2020-11-23
- 网络出版日期: 2022-03-29

EFFECT OF RIGID PILES ON BEARING PROPERTIES OF COMPOSITE FOUNDATION WITH GEOGRID-REINFORCED CUSHIONS SUPPORTED WITH PILES SUBJECTED TO CYCLIC LOADS

LI Tianbao¹,
XU Jiapei^2,3,
LIU Kaifu^{2
, ,}

1. Zhejiang Guangsha Vocational and Technical University of Construction, Dongyang 322100, China;
2. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China;
3. Linhai Water Group Co., Ltd., Zhejiang, Linhai 317000, China

摘要

摘要: 刚性桩的设置对加筋垫层复合地基影响的承载性状有明显的影响,但对刚性桩在循环荷载下对桩承加筋垫层复合地基影响的研究尚较少见。通过对多组刚-柔性桩桩承加筋垫层复合地基的模型试验,对比分析柔性桩或刚-柔性桩桩承加筋垫层复合地基在循环荷载下的地基沉降、桩身应变和土工格栅张拉力变化规律。试验结果表明:复合地基沉降随着循环荷载循环次数增加而增大,刚性桩的加入和增加土工格栅层数能有效降低复合地基的沉降,但增加土工格栅层数的效果不如增加刚性桩明显;桩身轴力沿桩深先增大后减小,且随着循环荷载循环次数增加而增大,相同循环荷载条件下,刚性桩的加入可以降低角桩与边桩所承担的荷载;土工格栅的张拉力随着循环荷载循环次数增加而增大,离桩越近,土工格栅张拉力越大,在桩土交界处达到最大值。刚性桩的加入不仅导致土工格栅的张拉力分布发生变化,还提高了土工格栅的张拉力。
- 复合地基 /
- 刚-柔性桩 /
- 模型试验 /
- 循环荷载 /
- 地基沉降 /
- 土工格栅
Abstract: Rigid pile has obvious effects on bearing properties of composite foundation with reinforced cushions. However, the effect of rigid piles on properties of composite foundation was still in research and the achievements were rarely reported. The changing laws of foundation subsidence, stress of piles and tensile forces of geogrids were analyzed based on some groups of model tests of composite foundation with geogrid-reinforced cushions supported with flexible piles or flexible-rigid piles. The test results showed that subsidence of composite foundation increased with the cycles of cyclic loads. The subsidence of composite foundation could be reduced by addition of rigid piles or of geogrid layers. The effect of adding rigid piles was more obvious than that of adding geogrid layers on reducing subsidence. Axial forces of piles first increased then decreasd along the pile shafts, and the axial forces increased with cycles of cyclic loads. The addition of rigid piles could reduce loads shared by side and corner piles in the same condition of cyclic loads. The tensile forces of geogrids increased with cycles of cyclic loads. The closer to the pile, the greater the tensile forces in geogrids. Tensile forces in geogrids reached the maximum at the junctions of piles and soil. The addition of rigid piles could not only change the distribution of tension forces in geogrids but also increase the tension forces in geogrids.
- composite foundation /
- rigid-flexible pile /
- model test /
- cyclic load /
- foundation subsidence /
- geogrid

HTML全文

参考文献(23)

[1]	龚晓南.复合地基理论及工程应用[M].北京:中国建筑工业出版社,2002.
[2]	娄炎,何宁,娄斌.长短桩复合地基中的土拱效应及分析[J].岩土工程学报,2011,33(1):76-79.
[3]	VEGA-MEYER R,SHAO Y.Geogrid-Reinforced and Pile-Supported Roadway Embankment[C]//Proceedings of Geo-Frontiers Congress.2005:1-13.
[4]	郑俊杰,曹文昭,董同新,等.中低压缩性土地区桩承式加筋路堤现场试验研究[J].岩土工程学报,2015,37(9):1549-1555.
[5]	PHAM H T V,SULEIMAN M T,WHITE D J.Numerical Analysis of Geosynthetic-Rammed Aggregate Pier-Supported Embankments[R].Iowa:Iowa State University,2003.
[6]	HAN J,GABR M A.Numerical Analysis of Geosynthetic-Reinforced and Pile-Supported Earth Platforms over Soft Soil[J].Journal of Geotechnical and Geoenvironmental Engineering,2002,128(1):44-53.
[7]	KOUSIK D,KUMAR S N,BABASAHEB N J.Laboratory Model Studies on Unreinforced and Geogrid-Reinforced Sand Bed over Stone Column-Improved Soft Clay[J].Geotextiles and Geomembranes,2011,29(2):190-196.
[8]	曹卫平,陈仁朋,陈云敏.桩承式加筋路堤土拱效应试验研究[J].岩土工程学报,2007,29(3):436-441.
[9]	费康,陈毅,王军军.桩承式路堤土拱效应发挥过程研究[J].岩土力学,2013,34(5):1367-1374.
[10]	徐超,宋世彤.桩承式加筋路堤土拱效应的缩尺模型试验研究[J].岩石力学与工程学报,2015,34(2):4343-4350.
[11]	陈仁朋,陈金苗,汪焱卫,等.桩网结构路基应力传递特性及累积沉降规律[J].土木工程学报,2015(增刊2):241-245.
[12]	高昂,张孟喜,朱华超,等.循环荷载及静载下土工格室加筋路堤模型试验研究[J].岩土力学,2016,37(7):1921-1928.
[13]	DOUGLAS R A.Repeated-Load Behavior of Geosynthtic-Built Unbound Roads[J].Canadian Geotechnical Journal,1997,34(2):197-203.
[14]	BOUSHEHRIAN A H,HATAF N,GHAHRAMANI A.Modeling of the Cyclic Behavior of Shallow Foundations Resting on Geomesh and Grid-Anchor Reinforced Sand[J].Geotextiles and Geomembranes,2011,29(3):242-248.
[15]	白顺果,张鸿儒,侯永峰.循环荷载下柔性桩复合地基永久沉降影响因素的试验研究[J].岩土工程学报,2011,32(8):1309-1313.
[16]	李西斌,吴金耀.高速列车荷载下桩承加筋路堤变形机制数值分析[J].岩土工程学报,2011,33(增刊2):232-237.
[17]	张崇磊,蒋关鲁,袁胜洋,等.循环荷载下桩网结构路基和垫层动力响应研究[J].岩土力学,2014,35(6):1664-1670.
[18]	赖汉江,郑俊杰,崔明娟.循环荷载下低填方桩承式路堤动力响应分析[J].岩土力学,2015,36(11):3252-3258.
[19]	ALAM M J I,GNANENDRAN C T,LO S R.Experimental and Numerical Investigations of the Behaviour of Footing on Geosynthetic Reinforced Fill Slope Under Cyclic Loading[J].Geotext.Geomembranes,2019,46(6):848-859.
[20]	WANG H L,CHEN R P,LIU Q.W,et al.Investigation on Geogrid Reinforcement and Pile Efficacy in Geosynthetic-Reinforced Pile-Supported Track-Bed[J].Geotext.Geomem-branes,2019,47(6):755-766.
[21]	PHAM H V,DIAS D.3D Numerical Modeling of a Piled Embankment Under Cyclic Loading[J].Int.J.Geomech.,2019,19(4),04019010.
[22]	张艳美,梁波.几何不平顺条件下高速公路路基的动态响应[J].兰州铁道学院学报,2001,20(4):66-69.
[23]	董忠红,吕彭民.高等级路面上的车辆动载荷[J].长安大学学报(自然科学版),2010(1):95-99.