摘要
通过室内模型试验对条带式加筋土挡墙的作用机理进行探讨.测试挡墙面板的水平位移、侧向土压力以及筋带轴向应变在填土表面局部逐级加载情况下的变化情况,并利用有限元软件进行数值模拟.数值模拟与模型试验结果一致表明,土体中加入筋体材料能明显提高其稳定性;在各级荷载作用下挡墙面板的侧向土压力沿墙高向下逐渐增大,而侧向位移沿墙高向下则逐渐减小;筋带的轴向应变呈单峰状分布.模型试验中,局部逐级荷载作用下,挡墙面板的侧向土压力增量沿墙高向下逐渐增大;侧向位移增量明显上部大于下部;筋带沿其轴向应变的增量先增大后减小.
The functional mechanism of striped bar-reinforced earth retaining wall was explored by means of indoor model test.On the basis of it,the variation of horizontal displacement of the wall-panel,lateral earth pressure,and axial strain of reinforcing stripe was tested under condition of partial stepwise loading onto fill surface.And then its numerical simulation was conducted with finite element software.The results of numerical simulation and model test were consistent with each other and it was shown that adding reinforcement material to soil could obviously improve its stability.Under the action of the load at all levels,the vertical lateral earth pressure on the wall panel would increase gradually downward,the vertical lateral displacement of the wall panel would decrease downward,but the axial strain of the reinforcing stripe would exhibit a single peak distribution.In the model test under action of partial stepwise loading,the increment of vertical lateral earth pressure on wall panel would gradually increase from top to bottom,the increment of lateral displacement would be greater at upper part than that at lower part,and,however,the increment of axial strain of the reinforcing stripe would increase first and then decrease.
作者
周凤玺
柳鸿博
刘云帅
ZHOU Feng-xi;LIU Hong-bo;LIU Yun-shuai(College of Civil Engineering,Lanzhou Univ. of Tech.,Lanzhou 730050,China;Engineering Research Center of Disaster Mitigation in Civil Engineering,the Ministry of Education,Lanzhou Univ. of Tech.,Lanzhou 730050,China)
出处
《兰州理工大学学报》
CAS
北大核心
2019年第1期132-136,共5页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51368038)
甘肃省陇原青年创新创业人才资助项目
关键词
加筋土挡墙
位移
土压力
筋带
数值模拟
bar-reinforced earth retaining wall
displacement
earth pressure
reinforcement strip
numerical simulation
