返包式土工格栅加筋土挡墙动态行为研究

发布时间：2018-01-29 18:46

本文关键词： 返包式土工格栅加筋土挡墙动力荷载模型试验　出处：《铁道学报》2016年02期 　论文类型：期刊论文

【摘要】：为研究返包式土工格栅加筋土挡墙在高速铁路列车荷载作用下的受力变形行为和作用机理,本文利用室内大型模型试验进行加筋土挡墙墙体加速度、动土压力、墙面变形、残余土压力及土工格栅拉伸应变等分布规律的研究。试验结果表明:加筋土挡墙内部竖向加速度受加载频率影响较大,加载频率10 Hz时加速度突然增大;墙面累积水平位移沿墙高呈S形分布,随着应力增大,水平位移最大值位置从墙中部逐渐向中下部移动;动土压力主要受动荷载大小及加载次数影响,沿墙高呈衰减趋势;动载卸载后残余土压力较小,经过增长后逐渐趋于稳定;筋材累积应变在填筑-静载-动载过程中呈增加-稳定-减小-稳定的趋势,沿拉筋长度方向呈单峰值或双峰值分布,峰值位置从高到低距墙面水平距离逐渐减小。
[Abstract]:On the return package type of geogrid reinforced soil retaining wall in high speed railway train load deformation behavior and mechanism of the large-scale indoor model test of reinforced earth retaining wall wall acceleration, earth pressure, wall deformation, residual soil pressure and geogrid tensile strain distribution test. The results show that the reinforced soil retaining wall internal vertical acceleration loading frequency effect, acceleration increases suddenly loading frequency of 10 Hz; the wall cumulative horizontal displacement along the wall is in the shape of S distribution, with increasing stress, the horizontal displacement of the maximum position from the middle wall gradually to the bottom; earth pressure is mainly affected by the dynamic load and the loading frequency effect along wall height decrease; small residual soil pressure load after unloading, after growth tends to be stable; reinforcement strain in filling - static - dynamic load in the process of increasing The trend of addition stability reduction stability is single peak or Shuangfeng value along the length of reinforcement, and the peak position decreases gradually from high to low distance.

【作者单位】：北京交通大学土木建筑工程学院;石家庄铁道大学土木工程学院;华中科技大学土木工程与力学学院;铁道第三勘察设计院集团有限公司;
【基金】：国家自然科学基金(51178280,51378322) 河北省高等学校创新团队领军人才培育计划(LJRC023)
【分类号】：TU476
【正文快照】： 对于大型结构及地基而言,由于试验设备、场地大小及资金等的限制,只能以缩尺模型进行试验。高速铁路加筋土挡墙进行模型试验的重要目标之一,是将原型挡墙在外荷载作用下的力学现象在挡墙模型上进行相似模拟,以测量模型结构中的土压力、位移、加速度等相关物理量,总结挡墙的变

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