文章摘要
位移模式对重力式加筋挡土挡墙受力特性影响模型试验
Model test on influence of displacement mode on mechanical characteristics of gravity reinforced retaining wall
投稿时间:2022-05-29  修订日期:2022-07-09
DOI:
中文关键词: 重力式加筋土挡土墙  土压力  模型试验  挡土墙位移  土工格栅
英文关键词: Gravity reinforced soil retaining wall  Soil pressure  Model test  Displacement of retaining wall  Geogrid
基金项目:国家自然科学基金(51669031);新疆交通设计院科研基金(编号:KY2019092504)项目资助
作者单位
杜浩源 石河子大学水利建筑工程学院 
贺国峰  
刘杰 新疆交通规划勘察设计研究院有限公司科技研发中心 
高斌  
艾钰皓  
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中文摘要:
      为研究重力式加筋土挡土墙在墙面板位移至极限主动状态下的土体受力与变形形态,通过改变加筋层数、筋材强度、筋材与挡土墙连接方式、筋材长度及挡土墙位移模式对挡土墙进行了6种工况的模型试验,进行了挡土墙极限主动状态所需最大位移量、墙内竖向土压力、墙背水平土压力、墙顶竖向位移及格栅拉伸应变等分布规律的研究。试验结果表明:加筋可以提高挡土墙达到极限主动状态所需最大位移量,减少墙背静止状态及主动状态下的墙背土压力;挡土墙进入极限主动状态时,墙后填土表面相对沉降较大;挡土墙位移对筋材应变影响很小;墙背后竖向土压力衰减量与深度正相关,平动模式衰减量最大,加载点下竖向土压力增大量与深度负相关。重力式加筋土挡土墙可于挡土墙上部与挡土墙底部提高筋材强度及筋材长度,墙背后提高铺筋层数或筋材强度并将格栅与挡土墙连接,结构中下部可适当减少铺筋长度,相比普通重力式挡土墙可提高挡土墙抗倾覆滑移能力,增强挡土墙结构稳定性
英文摘要:
      In order to study the soil force and deformation pattern of gravity reinforced soil retaining wall when the wall panel displacement reaches the ultimate active state, six kinds of model tests of retaining wall were carried out by changing the number of reinforcement layers, the strength of reinforcement, the connection mode of reinforcement and retaining wall, the length of reinforcement and the displacement mode of retaining wall. The distribution laws of the maximum displacement required for the ultimate active state of retaining wall, the vertical earth pressure inside the wall, the horizontal earth pressure behind the wall, the vertical displacement of the wall top and the tensile strain of the grid were studied. The test results show that the reinforcement can improve the maximum displacement required for the retaining wall to reach the limit active state, and reduce the earth pressure on the back of the wall in the static state and active state. When the retaining wall enters the limit active state, the relative settlement of the backfill surface behind the wall is large ; the displacement of retaining wall has little effect on the strain of reinforcement ; the attenuation of vertical soil pressure behind the wall is positively correlated with depth, and the attenuation of translational mode is the largest. The increase of vertical soil pressure under loading point is negatively correlated with depth. Gravity reinforced earth retaining wall can improve the reinforcement strength and reinforcement length at the upper part of the retaining wall and the bottom of the retaining wall. Behind the wall, the number of reinforcement layers or reinforcement strength is increased and the grid is connected to the retaining wall. The length of reinforcement can be appropriately reduced at the middle and lower parts of the structure. Compared with the ordinary gravity retaining wall, it can improve the anti-dumping sliding ability of the retaining wall and enhance the stability of the retaining wall structure.
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