摘要
以成昆铁路新型整体刚性面板加筋土挡墙为工程依托,通过现场原型试验,研究挡墙基底垂直应力、返包体背部水平和垂直土压力、不同层位土工格栅应变、墙体压缩量及墙面水平位移的变化规律。结果表明:基底垂直应力沿筋长呈双峰分布,靠近返包体处基底垂直应力随时间而减小,其余部位随时间而增大;返包体背部水平土压力、垂直土压力沿墙高方向呈非线性分布;格栅应变随时间呈双峰变化,且从墙体底层至顶层,变化速率逐渐增大;面板完成后,墙体压缩量增长速率明显减小,路中墙体压缩量大于路肩墙体压缩量;墙面总体水平位移小于1 mm;挡墙的抗震性能良好,发生5.1级和3.3级2次地震后,基底垂直应力最大增大4.9%,返包体背部水平土压力减小3.6%~20.0%,垂直土压力减小2.0%~7.9%,格栅应变、墙体压缩量和墙面水平位移均略有增大。
Based on the new type of reinforced retaining wall with full-height rigid facing for Chengdu-Kunming Railway, the variation rules of the vertical stress of retaining wall base, the horizontal and vertical soil pressures on the back of gravel bag, geogrid strains at different layers, the wall compression and the horizontal displacement of wall facing were studied through field prototype test. Results show that the vertical stress of the base is bimodal along the length of the reinforcement. The vertical stress of the base near the gravel bag decreases with time, while the rest increases with time. The horizontal and vertical soil pressures on the back of gravel bag are nonlinear along the height of the wall. The grid strain changes with time in a bimodal manner,and the change rate increases gradually from the bottom to the top of the wall. After the facing is completed, the growth rate of wall compression decreases obviously. The wall compression in the roadbed center is greater than that in the roadbed shoulder. The overall horizontal displacement of the wall facing is less than 1 mm. The seismic performance of the retaining wall is good. After two earthquakes with the magnitudes of 5. 1 and 3. 3,the maximum vertical stress of the base increases by 4. 9 %. The horizontal and vertical soil pressures on the back of gravel bag decrease by 3. 6%~20. 0% and 2. 0%~7. 9%, respectively. The grid strain, wall compression and wall horizontal displacement increase slightly.
作者
牛笑笛
杨广庆
周诗广
杨国涛
王智猛
王贺
NIU Xiaodi;YANG Guangqing;ZHOU Shiguang;YANG Guotao;WANG Zhimeng;WANG He(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;School of Traffic and Transportation,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;China Railway Society,Beijing 100844,China;China State Railway Group Co.,Ltd.,Beijing 100844,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2020年第5期1-10,共10页
China Railway Science
基金
国家自然科学基金资助项目(51378322,51709175)
中国铁路总公司科技研究开发计划项目(2015G006-I)
河北省自然科学基金资助项目(E2019208159)。
关键词
成昆铁路
加筋土挡墙
整体刚性面板
现场试验
土压力
位移
Chengdu-Kunming Railway
Reinforced retaining wall
Full-height rigid facing
Field test
Soil pressure
Displacement
作者简介
第一作者:牛笑笛(1991—),男,河北保定人,博士。E-mail:tdniuxd@163.com;通讯作者:杨广庆(1971—),男,河北沧州人,教授,博士研究生导师,博士。E-mail:gtsyang@vip.163.com。
