刚性基础下长短桩复合地基桩桩相互作用机制的模型试验
|
摘要
为了进一步了解刚性长短桩复合地基桩桩桩相互作用机制,本文通过室内模型试验,对比分析了单桩复合地基与四桩复合地基的荷载-沉降曲线、桩身轴力、桩侧摩阻力、桩土应力比和桩顶上刺入的试验结果。单桩复合地基与四桩复合地基中,各桩在位于距桩顶1/3桩长处出现轴力拐点和桩侧摩阻力中性点。但由于长桩与短桩相互作用,四桩复合地基中长桩的轴力出现第二个轴力拐点和桩侧摩阻力中性点,而短桩受到影响较小,且随着荷载的增加,短桩对长桩轴力的影响逐渐减小。
In order to further understand the pile-pile interaction mechanism of rigid long-short pile composite foundation, the load-settlement curve, axial force of pile body, pile side friction resistance, pile-soil stress ratio and pile penetration test results of single-pile composite foundation and four-pile composite foundation are compared and analyzed through indoor model tests. In the composite foundation of single pile and four piles, the inflection point of axial force of each pile and the neutral point of side friction of each pile are located at the advantage of 1/3 pile from the top of the pile. Because of the interaction between long piles and short piles, the second inflection point of axial force and the neutral point of side friction of long piles appear in the four-pile composite foundation, and the short piles are less affected. With the increase of load, the influence of short piles on the axial force of long piles decreases.
In order to further understand the pile-pile interaction mechanism of rigid long-short pile composite foundation, the load-settlement curve, axial force of pile body, pile side friction resistance, pile-soil stress ratio and pile penetration test results of single-pile composite foundation and four-pile composite foundation are compared and analyzed through indoor model tests. In the composite foundation of single pile and four piles, the inflection point of axial force of each pile and the neutral point of side friction of each pile are located at the advantage of 1/3 pile from the top of the pile. Because of the interaction between long piles and short piles, the second inflection point of axial force and the neutral point of side friction of long piles appear in the four-pile composite foundation, and the short piles are less affected. With the increase of load, the influence of short piles on the axial force of long piles decreases.
引文
[1] 龚晓南.广义复合地基理论及工程应用[J].岩土工程学报,2007,29(1):1-13
[2] 王伟,杨敏,杨桦.长短桩桩基础与其它类型基础的比较分析[J].建筑结构学报,2006,27(1):124-129
[3] 林本海,方辉.长短桩高强复合地基在高层建筑中的应用[J].岩土力学,2009,30(S2):302-307
[4] 黄茂松,李波,程岳.长短桩组合路堤桩荷载分担规律离心模型试验与数值模拟[J].岩石力学与工程学报,2010,29(12):2543-2550
[5] 李波,黄茂松,程岳,等.路堤荷载下长短桩组合型复合地基现场试验与数值模拟[J].中国公路学报,2013,26(1):9-14
[6] Moayed R Z,Izadi E,Mirsepahi M.3D finite elements analysis of vertically loaded composite piled raft[J].Journal of Central South University,2013,20(6):1713-1723
[7] Sharma V J,Vasanvala S A,Solanki C H.Study of cushioned composite piled raft foundation behaviour under seismic forces[J].Australian Journal of Civil Engineering,2015,13(1):32-39
[8] 周同和,王非,赵宏,等.多桩型刚性承台下刚性长短桩复合地基载荷试验分析[J].岩土工程学报,2015,37(1):105-111
[9] 郭院成,李明宇,李永辉.刚性长短桩复合地基桩土应力比试验[J].哈尔滨工业大学学报,2009,(8):199-201
[10] 郭院成,张四化,李明宇.长短桩复合地基试验研究及数值模拟分析[J].岩土工程学报,2010,(S2):232-235
[11] 张东刚,张震,闫明礼,等.端承刚性桩复合地基增强体上刺入试验研究[J].建筑科学,2014,30(5):52-57
[12] Emilos M C,Mello C P,Ioannis K R.Pile foundation analysis and design using experimental data and 3D numerical analysis[J].Computers and Geotechnics,2009,36:819-836
[13] 张胜利.土压力传感器与土介质相互作用特性分析[D].成都:西南交通大学,2010
[14] JGJ 79—2012,建筑地基处理技术规范[S]
[15] 夏力农.桩基负摩阻力特性的理论与试验研究[D].长沙:中南大学,2007
[2] 王伟,杨敏,杨桦.长短桩桩基础与其它类型基础的比较分析[J].建筑结构学报,2006,27(1):124-129
[3] 林本海,方辉.长短桩高强复合地基在高层建筑中的应用[J].岩土力学,2009,30(S2):302-307
[4] 黄茂松,李波,程岳.长短桩组合路堤桩荷载分担规律离心模型试验与数值模拟[J].岩石力学与工程学报,2010,29(12):2543-2550
[5] 李波,黄茂松,程岳,等.路堤荷载下长短桩组合型复合地基现场试验与数值模拟[J].中国公路学报,2013,26(1):9-14
[6] Moayed R Z,Izadi E,Mirsepahi M.3D finite elements analysis of vertically loaded composite piled raft[J].Journal of Central South University,2013,20(6):1713-1723
[7] Sharma V J,Vasanvala S A,Solanki C H.Study of cushioned composite piled raft foundation behaviour under seismic forces[J].Australian Journal of Civil Engineering,2015,13(1):32-39
[8] 周同和,王非,赵宏,等.多桩型刚性承台下刚性长短桩复合地基载荷试验分析[J].岩土工程学报,2015,37(1):105-111
[9] 郭院成,李明宇,李永辉.刚性长短桩复合地基桩土应力比试验[J].哈尔滨工业大学学报,2009,(8):199-201
[10] 郭院成,张四化,李明宇.长短桩复合地基试验研究及数值模拟分析[J].岩土工程学报,2010,(S2):232-235
[11] 张东刚,张震,闫明礼,等.端承刚性桩复合地基增强体上刺入试验研究[J].建筑科学,2014,30(5):52-57
[12] Emilos M C,Mello C P,Ioannis K R.Pile foundation analysis and design using experimental data and 3D numerical analysis[J].Computers and Geotechnics,2009,36:819-836
[13] 张胜利.土压力传感器与土介质相互作用特性分析[D].成都:西南交通大学,2010
[14] JGJ 79—2012,建筑地基处理技术规范[S]
[15] 夏力农.桩基负摩阻力特性的理论与试验研究[D].长沙:中南大学,2007