模块式加筋土挡墙模型试验及静动力学性能研究

doi:10.16285/j.rsm.2022.0841

岩土力学 ›› 2023, Vol. 44 ›› Issue (5): 1435-1444.doi: 10.16285/j.rsm.2022.0841

模块式加筋土挡墙模型试验及静动力学性能研究

王家全^{1, 2, 3}，仲文涛^{1, 2, 3}，黄世斌^{1, 2, 3}，唐毅^{1, 2, 3}

1. 广西科技大学土木建筑工程学院，广西柳州 545006；2. 广西壮族自治区岩土灾变与生态治理工程研究中心，广西柳州 545006； 3. 广西高校防灾减灾与预应力技术重点实验室，广西柳州 545006

收稿日期:2022-06-06 接受日期:2022-09-05 出版日期:2023-05-09 发布日期:2023-04-30
通讯作者: 黄世斌，男，1974年生，硕士，高级实验师，主要从事道路工程方面的研究。E-mail: hsb321@163.com E-mail: wjquan1999@163.com
作者简介:王家全，男，1981年生，博士，教授，主要从事加筋土结构、地基基础工程、土木工程灾害防治等方面的研究。
基金资助:
国家自然科学基金项目（No. 41962017）；广西自然科学基金重点项目（No. 2022GXNSFDA035081）；广西高等学校高水平创新团队及卓越学者计划项目（桂教人才[2020]6号）；广西研究生教育创新计划项目（No. YCSW2021310）

Experimental study on static and dynamic performances of modular reinforced earth retaining wall

WANG Jia-quan^{1, 2, 3}, ZHONG Wen-tao^{1, 2, 3}, HUANG Shi-bin^{1, 2, 3}, TANG Yi^{1, 2, 3}

1. College of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou, Guangxi 545006, China; 2. Guangxi Zhuang Autonomous Region Engineering Research Center of Geotechnical Disaster and Ecological Control, Liuzhou, Guangxi 545006, China; 3. Guangxi University Key Laboratory of Disaster Prevention and Mitigation and Prestress Technology, Liuzhou, Guangxi 545006, China

Received:2022-06-06 Accepted:2022-09-05 Online:2023-05-09 Published:2023-04-30
Supported by:
This work was supported by the National Natural Science Foundation of China (41962017), the Natural Science Foundation of Guangxi Province of China (2022GXNSFDA035081), the High Level Innovation Team and Outstanding Scholars Program of Guangxi Institutions of Higher Learning of China ([2020]6) and the Innovation Project of Guangxi Graduate Education (YCSW2021310).

摘要/Abstract

摘要： 加筋土挡墙作为道路路基的一部分，不但受到路面基础设施等静荷载，还承受着车辆行驶所带来的交通荷载。为研究静、动荷载下模块式加筋土挡墙的力学特性及工作性能，开展室内大模型试验，对比分析了加筋土挡墙的沉降及面板水平位移、侧向土压力系数、格栅应变等力学行为的变化规律。结果表明：静、动荷载下挡墙的破坏模式分别以局部剪切破坏和面板挤出破坏为主，格栅的最大应变量分别为1.7% 和4 .5%，均未达到破坏应变；两种荷载下挡墙的极限承载力相等，相比于静载，动载作用下墙顶最大沉降量增大了280%，面板最大水平位移增大了180%；加载板下降过程中四周土体受挤压发生变形，向面板施加额外的水平附加应力，从而导致墙背处的侧向附加应力系数 K_r高于理论值；动载作用下土颗粒不规则运动，土中动加速度响应受动载幅值的影响较大，靠近墙面处的加速度峰值沿墙高H由上到下逐渐减小。研究成果有助于揭示静载与交通荷载作用下加筋土挡墙的力学行为和破坏机制以及提高模型试验与实际工程的关联程度。

关键词: 模块式加筋土挡墙, 静荷载, 交通荷载, 力学特性

Abstract:

Reinforced earth retaining walls, as part of the roadbed, are not only subjected to static loads such as road infrastructure, but also subjected to traffic loads caused by vehicle movements. To investigate the mechanical properties and working performance of modular reinforced earth retaining walls under static and dynamic loads, the large-scale laboratory model tests were conducted, in which the variation laws of the mechanical behaviors such as the settlement of reinforced earth retaining walls, horizontal displacement of panels, lateral earth pressure coefficient and geogrid strain were compared and analyzed. The results showed that the damage modes of retaining walls under static and dynamic loads are local shear damage and panel extrusion damage, respectively, and the maximum strains of the geogrid are 1.7% and 4.5%, respectively, neither of which reaches the damage strain. The ultimate bearing capacities of the retaining wall under both static and dynamic loads are identical, and the maximum settlement of the top of the wall under dynamic load is increased by 280% and the horizontal displacement of the panel is increased by 180% compared with those under the static load. The deformation of the surrounding soil by extrusion during the descent of the load plate imposes horizontal additional stress on the panel, resulting in a larger lateral additional stress coefficient K_r than the theoretical value at the back of the wall. Under the action of dynamic load, the soil particles move irregularly, and the peak acceleration in the soil increases with the increase in load amplitude and decreases gradually from top to bottom along the height of retaining wall. The research results are important in revealing the mechanical behavior and damage mechanisms of reinforced earth retaining walls under static and traffic loads and in improving the relevance of model tests to actual engineering.

Key words: modular reinforced earth retaining wall, static load, traffic load, mechanical properties

中图分类号:

TU 470

王家全, 仲文涛, 黄世斌, 唐毅, . 模块式加筋土挡墙模型试验及静动力学性能研究[J]. 岩土力学, 2023, 44(5): 1435-1444.

WANG Jia-quan, ZHONG Wen-tao, HUANG Shi-bin, TANG Yi, . Experimental study on static and dynamic performances of modular reinforced earth retaining wall[J]. Rock and Soil Mechanics, 2023, 44(5): 1435-1444.

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模块式加筋土挡墙模型试验及静动力学性能研究

Experimental study on static and dynamic performances of modular reinforced earth retaining wall

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