Experimental investigation on dynamic characteristics of XCC pile-geogrid composite foundation under static and dynamic loads of vehicles

YIN Feng; ZHOU Hang; LIU Han-long; CHU Jian

doi:10.16285/j.rsm.2017.2363

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Experimental investigation on dynamic characteristics of XCC pile-geogrid composite foundation under static and dynamic loads of vehicles

更新时间：2026-06-25

- Experimental investigation on dynamic characteristics of XCC pile-geogrid composite foundation under static and dynamic loads of vehicles
- Vol. 40, Issue 4, Pages: 1324-1330(2019)
- 作者机构：
  
  1. 重庆大学土木工程学院
  2. 重庆大学山地城镇建设与新技术教育部重点实验室
  3. 南洋理工大学土木与环境工程学院
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.2363
  CLC： U416.1
- Published：2019
- 稿件说明：
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[1]尹锋,周航,刘汉龙,楚剑.车辆载重与动荷载对X形桩桩-网复合地基动力特性影响的试验研究[J].岩土力学,2019,40(04):1324-1330+1340.

YIN Feng, ZHOU Hang, LIU Han-long, et al. Experimental investigation on dynamic characteristics of XCC pile-geogrid composite foundation under static and dynamic loads of vehicles[J]. 2019, 40(4): 1324-1330.
[1]尹锋,周航,刘汉龙,楚剑.车辆载重与动荷载对X形桩桩-网复合地基动力特性影响的试验研究[J].岩土力学,2019,40(04):1324-1330+1340. DOI： 10.16285/j.rsm.2017.2363.

YIN Feng, ZHOU Hang, LIU Han-long, et al. Experimental investigation on dynamic characteristics of XCC pile-geogrid composite foundation under static and dynamic loads of vehicles[J]. 2019, 40(4): 1324-1330. DOI： 10.16285/j.rsm.2017.2363.

摘要

基于大比例模型试验

采用半正弦波模拟移动车辆荷载

通过开展不同车辆载重和动荷载作用下X形桩桩-网复合地基的动力特性模型试验

分析桩身动应力、土拱效应、动土压力、垫层应力传递系数、格栅动应变等的变化规律

初步揭示了车辆载重和动荷载对X形桩桩-网复合地基的影响机制。试验结果表明

车辆动荷载对X形桩桩身动应力的影响深度约为2 m;车辆载重和动荷载的增加会导致桩间土承受更多的动应力

并且会降低路肩处土工格栅的作用;但是

路基中心的垫层应力传递系数几乎保持不变;土工格栅的动应变比超过0.048时

格栅累积变形会随着车辆载重和动荷载的增加迅速增大。

Abstract

The dynamic characteristics of X-section cast-in-situ concrete（XCC） pile-geogrid composite foundation under half sine wave loading simulating different static and dynamic loads from a moving vehicle axle are investigated in large-scale model tests.The dynamic stress of an XCC pile

soil arching

dynamic soil pressure

the stress transfer coefficient of the cushion

dynamic strain of the geogrid are analyzed. The mechanism of XCC pile-geogrid composite foundation influenced by the static and dynamic loads of vehicles is preliminarily revealed. The test results show that the influence depth of dynamic loads on stress of an XCC pile is 2 meters.More dynamic stresses are supported by the soil between piles and the effect of a geogrid on the road shoulder is weakened with the increasing of the static and dynamic loads. The stress transfer coefficient of the cushion located in the center of subgrade is constant with the increasing of the static and dynamic loads. The cumulative deformation of a geogrid increases rapidly with the increasing of the static and dynamic loads as the value of the ratio of dynamic strain is over 0.048.

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