不同车速下高速公路X形桩网复合地基动力特性研究

尹锋; 刘汉龙; 陈育民; 李建斌; 周航; 楚剑

doi:10.11779/CJGE201803020

不同车速下高速公路X形桩网复合地基动力特性研究 English Version

尹锋^1,2,
刘汉龙^1,2,3,
陈育民³,
李建斌^1,2,
周航^1,2,
楚剑⁴

1. 重庆大学山地城镇建设与新技术教育部重点实验室,重庆 400045;
2. 重庆大学土木工程学院,重庆 400045;
3. 河海大学土木与交通学院,江苏南京 210098;
4. 南洋理工大学土木与环境工程学院,新加坡

基金项目: 国家自然科学基金国际（地区）合作与交流项目（51420105013）; 国家自然科学基金青年基金项目（51708063）

详细信息

作者简介:
尹锋(1988-),男,博士研究生,主要从事高速公路地基处理以及可视化方面的研究工作。E-mail:yinf1988@163.com。

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出版历程
- 收稿日期: 2016-09-04
- 发布日期: 2018-03-24

Dynamic response of XCC pile-geogrid composite foundation of expressways influenced by vehicles with different speeds

1. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China;
2. College of Civil Engineering, Chongqing University, Chongqing 400045, China;
3. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;
4. School of Civil and Environmental Engineering, Nanyang Technology University, Singapore

摘要

摘要: 基于大比例模型试验系统,开展高速公路车辆荷载作用下X形桩网复合地基动力模型试验研究;测试了不同车速作用下桩网复合路基的动力响应,包括路基内部动应力分布、动应力扩散、格栅动应变、格栅累积应变、桩土差异沉降等的变化规律。结果表明,高速和低速状态下,动应力均会在格栅处产生波动,并且高频车速对车辆附加荷载贡献较小;当车速达到高速状态时,格栅的动应变变化较小,路肩处的垫层应力传递系数要小于路基中心处;格栅动应变比与格栅应变增量比存在线性关系,并且格栅的累积变形主要是在低速状态下产生的;车速越快,X形桩身动应力幅值越大,其桩身轴力小于圆形桩。
- 桩网结构路基 /
- X形桩 /
- 交通荷载 /
- 动力响应 /
- 模型试验
Abstract: Based on the large-scale model test system, dynamic model tests on geogrid-reinforced XCC piles-supported embankment of expressways under traffic loads are carried out. The dynamic parameters under the vehicles different speeds are monitored. The variations of dynamic stress distribution, dynamic stress diffusion, geogrid dynamic strain, geogrid cumulative strain and differential settlement are studied. The results show that the amplitude of dynamic stress above soils fluctuates near the geogrid in the case of high and low speeds. There is a little difference in the additional load of the vehicle with high speed. The dynamic strain of geogrid remains stable in the case of high speed. The stress transfer coefficient of the cushion located in the center of subgrade is larger than that near the shoulder. The relationship between the dynamic strain and the cumulative strain of geogrid can be described by the linear function, and the cumulative deformation of geogrid is mainly produced under low speed. The amplitude of dynamic stress of a XCC pile increases with the increasing speed, and its axial force is smaller than that of the circular pile.
- column-net structure subgrade /
- XCC pile /
- traffic load /
- dynamic response /
- model test

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