长江科学院院报 ›› 2018, Vol. 35 ›› Issue (10): 109-114.DOI: 10.11988/ckyyb.20170447

• 岩土工程 • 上一篇    下一篇

不同筋材刚度下加筋土挡墙离心模型试验

汪磊, 张垭, 向前勇, 刘华北   

  1. 华中科技大学 土木工程与力学学院,武汉 430074
  • 收稿日期:2017-04-21 出版日期:2018-10-01 发布日期:2018-10-22
  • 通讯作者: 刘华北(1973-),男,广东普宁人,教授,博士,博士生导师,主要从事加筋土工程与地下结构工程方面的教学与科研工作。E-mail:hbliu@hust.edu.cn
  • 作者简介:汪 磊(1987-),男,湖北随州人,博士研究生,主要从事加筋土挡墙内力研究工作。E-mail:yaoshi.wang@163.com
  • 基金资助:
    国家自然科学基金项目(51379082)

Centrifuge Tests of Reinforced Soil Retaining Wall withDifferent Reinforcement Stiffness

WANG Lei , ZHANG Ya , XIANG Qian-yong, LIU Hua-bei   

  1. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology,Wuhan 430074, China
  • Received:2017-04-21 Online:2018-10-01 Published:2018-10-22

摘要: 加筋土挡墙由于优良的力学性能、低廉的造价、更好的地形适应性,已经越来越广泛地被应用于各种工程。但其在正常工作状态下的真正工作机理尚不完全清楚,目前的规范设计指南并不能反映加筋土挡墙内部应力真实分布情况。为了研究不同筋材刚度对加筋土挡墙性能的影响,通过土工离心试验监测了土工格栅应变、面板水平位移和土压力。试验结果表明:采用小刚度筋材时,筋材的变形更加显著,但对竖向土压力的分布基本没有影响;靠近面板区域的土压力都远小于理论值,格栅最大应变出现在墙的中下部;对于面板连接处的筋材应变不能简单地用传统土压力理论解释,还需考虑填土不均匀沉降引起的面板对加筋土拉拽作用等其他影响因素。试验结果可为正常工况下加筋土挡墙工作性能与筋-土相互作用机理的研究提供参考。

关键词: 加筋土挡墙, 土工离心试验, 筋材刚度, 土工格栅应变, 土压力

Abstract: Reinforced soil retaining wall has been widely used in various projects because of its excellent mechanical properties, lower costs and better terrain adaptability. However, its real mechanism under working stress condition is not completely clear and current design guidelines could not reflect the real stress distribution in reinforced retaining wall. In order to research the behavior of reinforced retaining wall with different reinforcement stiffness, we monitor geogrid strain, horizontal displacement of facing, and earth pressure by geotechnical centrifuge tests. Results indicate that the deformation of reinforcement is more significant when using reinforcement of small stiffness,while the distribution of vertical earth pressure along the potential sliding surface is barely affected by stiffness. In both models, earth pressure adjoining to facing panel is much lower than theoretical value, and the maximum strain of geogrid appears in the mid-lower part of wall. Traditional earth pressure theory could not simply explain the reinforcement strain at panel connections. We should also take into account the pulling effect between panel and reinforced soil induced by differential settlement of backfill and other factors. The tests results offer reference for researching the behavior of reinforced soil retaining wall and the mechanism of interaction between soil and reinforcement under working stress conditions.

Key words: reinforced soil retaining wall, geotechnical centrifugal test, stiffness of reinforcement, strain of geogrid, earth pressure

中图分类号: