Study on deformation and failure mechanisms of reinforced soil retaining walls subjected to horizontal static/dynamic loading
REN Feifan1,2,XU Huan1,HUANG Qiangqiang1
(1. Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China)
Abstract:In practical engineering,reinforced earth retaining walls bear not only vertical load but also horizontal static load and impact load. In this paper,indoor model tests of reinforced earth retaining walls subjected to horizontal static and dynamic loads were carried out. The deformation,horizontal earth pressure,reinforcement strain and potential failure surface were analyzed and summarized respectively to explore the deformation and failure mechanisms. The results show that the stability of reinforced earth retaining walls can be enhanced by reducing the reinforcement spacing and increasing the length of reinforcement material,which are also beneficial to control the deformation,and that it is more effective to increase the reinforcement length to resist the impact load. The deformation and the earth pressure develop gradually under the action of the horizontal static load,but have obvious“stepped”sudden changes under the action of the impact load. The reinforcement strain under both static and dynamic loads presents a single peak state,and the peak strain at each reinforcement layer decreases from top to bottom,which is consistent with the deformation of the retaining walls. The failure mode of the retaining walls under the horizontal load is different from that under the vertical load. When the length of the reinforcement is 0.75 times the wall height H,the reinforced soil retaining walls under static and dynamic loads will be damaged at the end of the reinforced area,but when the length is increased to 1.5H,the failure modes under static and dynamic loads are different. The results of this research can not only provide basis and reference for the design and research of reinforced soil retaining walls under the horizontal load,but also enrich the theory of reinforced soils.
杨广庆,徐 超,张孟喜,等. 土工合成材料加筋土结构应用技术指南[M]. 北京:人民交通出版社股份有限公司,2016:6-12.(YANG Guangqing,XU Chao,ZHANG Mengxi,et al. Technical guide for the application of geosynthetic reinforced soil structures[M]. Beijing:China Communication Press Co.,Ltd.,2016:6-12.(in Chinese))
[8]
王家全,张亮亮,赖 毅,等. 加筋土挡墙静动力学特性大模型试验研究[J]. 岩土力学,2019,40(2):497-505.(WANG Jiaquan,ZHANG Liangliang,LAI Yi,et al. Large-scale model tests on static and dynamic mechanical characteristics of reinforced earth retaining wall[J]. Rock and Soil Mechanics,2019,40(2):497-505.(in Chinese))
[11]
黄 聪,余文成,王志兵,等. 墙顶复杂外力作用下加筋土挡墙模型试验研究[J]. 土工基础,2018,32(6):676-680.(HUANG Cong,YU Wencheng,WANG Zhibing,et al. Model test of reinforced earth retaining walls under complicated load conditions acting of the top of wall[J]. Soil Engineering and Foundation,2018,32(6):676-680.(in Chinese))
[3]
李丽华,石安宁,肖衡林,等. 加筋土挡墙静载模型试验及其力学性能研究[J]. 岩土力学,2018,39(12):4 360-4 368.(LI Lihua,SHI Anning,XIAO Henglin,et al. Model test and mechanical properties study of reinforced earth retaining wall[J]. Rock and Soil Mechanics,2018,39(12):4 360-4 368.(in Chinese))
[10]
KRISHNA A M,BHATTACHARJEE A. Seismic analysis of reinforced soil retaining walls[J]. Geotechnical Design and Practice,2019:159-171.
[13]
张智超,陈育民,刘汉龙,等. 微型桩-加筋土挡墙路基结构的公路护栏抗冲击性能[J]. 中南大学学报:自然科学版,2017,48(8):2 169-2 179.(ZHANG Zhichao,CHEN Yumin,LIU Hanlong,et al. Impact resistance of road barrier of micropile-MSE wall for subgrade[J]. Journal of Central South University:Science and Technology,2017,48(8):2 169-2 179.(in Chinese))
[15]
汪 磊. 竖直加筋土挡墙筋材拉力计算方法及筋材刚度设计方法研究[博士学位论文][D]. 武汉:华中科技大学,2018.(WANG Lei. Prediction method of reinforcement load and design method of reinforcement stiffness for vertical reinforced soil retaining walls[Ph. D. Thesis][D]. Wuhan:Huazhong University of Science and Technology,2018.(in Chinese))
[17]
马明江,陈 丽. 冲击作用时间的分析计算[J]. 平顶山工学院学报,2004,(4):68-70.(MA Mingjiang,CHEN Li. Analysis and calculation on working time of collision[J]. Journal of Pingdingshan Insittute of Technology,2004,(4):68-70.(in Chinese))
[2]
黄强强,任非凡. 动荷载及降雨影响下加筋土结构稳定性研究现状综述[C]// 2019年全国工程地质学术年会论文集. 北京:[s. n.],2019:320-327.(HUANG Qiangqiang,REN Feifan. A research review of the stability of reinforced soil structures with consideration of dynamic load and rainfall[C]// Proceedings of 2019 Annual Conference of Engineering Geology. Beijing:[s. n.],2019:320- 327.(in Chinese))
[4]
廖红建,熊甜甜,杨 博,等. 刚性面板加筋土挡墙室内模型试验研究[J]. 防灾减灾工程学报,2018,38(5):837-843.(LIAO Hongjian,XIONG Tiantian,YANG Bo,et al. Indoor model experiment study on reinforced retaining wall[J]. Journal of Disaster Prevention and Mitigation Engineering,2018,38(5):837-843.(in Chinese))
[5]
陈建峰,顾建伟,石振明,等. 软土地基加筋土挡墙现场试验研究[J]. 岩石力学与工程学报,2011,30(增1):3 370-3 375.(CHEN Jianfeng,GU Jianwei,SHI Zhenming,et al. Field test study of reinforced soil wall on soft ground[J]. Chinese Journal of Rock Mechanics and Engineering,2011,30(Supp.1):3 370-3 375.(in Chinese))
[7]
刘 泽,史克友,黄天琪,等. 车辆荷载作用下加筋土挡墙的静动响应现场试验[J]. 水文地质工程地质,2017,44(4):91-97.(LIU Ze,SHI Keyou,HUANG Tianqi,et al. Field test of static and dynamic response of reinforced earth retaining wall under vehicle load[J]. Hydrogeology and Engineering Geology,2017,44(4):91-97.(in Chinese))
[9]
KOERNER R M,KOERNER G R. A date base,statistics and recommendations regarding 171 failed geosynthetic reinforced mechanically stabilized earth(MSE) walls[J]. Geotextiles and Geomembranes,2013,16(5):364-373.
[6]
王 贺,杨广庆,吴连海,等. 墙顶荷载对加筋土挡墙工作特性影响的试验研究[J]. 岩石力学与工程学报,2014,33(12):2 573-2 581. (WANG He,YANG Guangqing,WU Lianhai,et al. Experimental study of geogrids reinforced retaining wall under overhead loading[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(12):2 573-2 581.(in Chinese))
[16]
赵其华,彭社琴. 岩土支挡与锚固工程[M]. 成都:四川大学出版社,2008:113-118.(ZHAO Qihua,PENG Sheqin. Retaining and anchor engineering for rock and soil mass[M]. Chengdu:Sichuan University Press,2008:113-118.(in Chinese))
[12]
LABA J T,KENNEDY J B,SEYMOUR P H. Reinforced earth retaining wall under vertical and horizontal strip loading[J]. Canadian Geotechnical Journal,1984,21(3):407-418.
[14]
仇含笑,李 正,丁月明,等. 麦秸秆加筋土挡墙抗滚石冲击性能研究[C]// 第二届全国高校土木工程专业大学生论坛论文集. [S. l.]:中国土木工程学会,2012:1-6.(QIU Hanxiao,LI Zheng,DING Yueming,et al. Study on the Impact resistance of wheat straw reinforced earth retaining wall to rolling stones[C]// Proceedings of the second National University of Civil Engineering Student Forum. [S. l.]:China Civil Engineering Society,2012:1-6.(in Chinese))