期刊文献+

软基路堤拓宽静压PHC管桩挤土效应现场试验 被引量:37

Field test on extruding soil caused of PHC pipe pile driving by static pressure for improving soft foundation of widened embankment
原文传递
导出
摘要 PHC(prestressed high-strength concrete)管桩近年来被广泛应用。PHC管桩为挤土沉桩模式,沉桩过程引起的挤土效应对周围环境产生不利影响并对其可打性和承载特性有重要影响。结合广-清(广州至清远)高速公路扩建工程,通过现场监测超静孔隙水压力和土体水平位移,进行PHC管桩挤土效应研究。水平位移利用固定式测斜仪测量,孔隙水压力使用振弦式孔压计测量,并使用自动系统进行数据采集。研究发现,沉桩过程中引起的超静孔隙水压力变化随深度增加近似呈线性增长,水平方向随距离的增加而减小;挤土效应产生的土体水平位移随距离的增大而减小,随深度增加而减小;挤土效应滞后现象明显,可导致成桩后的桩体倾斜;拓宽地基场地上管桩施工对老路地基影响小,场地条件对沉桩挤土效应影响大,老路路堤对垂直于路基方向的水平位移有约束作用。 PHC pipe pile is widely used in recent years. The application of PHC pipe pile belongs to soil compaction pile-sinking mode. The compaction effect caused during piles driving would produce adversely effects on the surrounding environment and affects its possibility and bearing characteristics. The study of compaction effect was conducted based on the measurements and statistics of excess pore water pressure and horizontal displacement in the Guang-Qing Expressway Expansion Project. Horizontal displacements were monitored by fixed inclinometer measurements, pore water pressure was measured using vibrating wire, and using the automatic data acquisition system of data acquisition. The studies show that excess pore water pressure which caused by pile-driving in the project presented approximately linearly with the depth increasing and reduced with the distance increasing in the horizontal direction. Soil horizontal displacement of soil compaction effects decreasing as the distance increasing; it also has the significantly of hysteresis which can lead to pile body tilt. Piling on the widened foundation influences the original foundation slightly, while the site conditions have remarkable impaction on pile driving effect. The old embankment restraints horizontal displacement perpendicular to the roadbed direction.
出处 《岩土力学》 EI CAS CSCD 北大核心 2013年第4期1089-1096,共8页 Rock and Soil Mechanics
基金 广东省交通运输厅科技计划项目资助(No.2011-02-021)
关键词 PHC管桩 广-清高速公路 挤土效应 孔隙水压力 水平位移 PHC pipe pile Guang-Qing Expressway compaction effect pore water pressure horizontal displacement
  • 相关文献

参考文献11

二级参考文献48

  • 1王钰,林军,陈锦剑,王建华.软土地基中PHC管桩水平受荷性状的试验研究[J].岩土力学,2005,26(S1):39-42. 被引量:42
  • 2朱合华,谢永健,王怀忠.上海软土地基超长打入PHC桩工程性状研究[J].岩土工程学报,2004,26(6):745-749. 被引量:34
  • 3王宏祺,陆仁华.PHC桩在水工工程中的应用:上海外滩防汛墙外移综合改造工程[J].港工技术与管理,1995(4):1-8. 被引量:1
  • 4PAIK Kyuho, SALGADO Rodrigo, LEE Junhwan, et al Behavior of open and closed-ended piles driven into sands[J] Journal of Geotechnical and Geoenvironmental Engineering 2003, 129(4): 296 - 306.
  • 5ZHOU Li-yun, CHEN Jian-bin, LAO Wei-kang. Construction control and pile body tensile stresses distribution pattern during driving[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(9): 1102 - 1109.
  • 6Sehmidt B. Earth Pressure at Rest Related to Stress History[ J ]. Canadian Geotechnical Journal, 1966, 3 (4) : 239 - 242.
  • 7Mayne P W, Kulhawy F H. Ko-OCR Relationship in Soil[ J]. Journal of Geotechnical Engineering Division, 1982, 108 (6) : 851 - 872.
  • 8Daramola O. On Estimating K0 for Overconsolidated Granular Soils [J]. Geotechnique, 1980, 30(3): 310 -313.
  • 9Radoslaw L, Michalowski F. Coefficient of Earth Pressure at Rest [ J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(11): 1429-1433.
  • 10Hanna A, Al-Romhein R. At-Rest Earth Pressure of Overconsolidated Cohesionless Soil [ J]. Journal of Geotechnical and Geoenvironmental Engineering, 2008, 134(3) : 408 -412.

共引文献285

同被引文献277

引证文献37

二级引证文献112

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部