对黏性土填土的加筋土挡土墙进行了蠕变有限元分析, 研究了填土蠕变大小对墙体的影响, 探讨了填土与筋材蠕变的相互作用机理。研究结果表明:当填土蠕变率大于筋材蠕变率时, 筋材在墙体建成后拉力将会持续增大, 并不表现应力松弛;随着填土蠕变率增大, 墙体水平位移及筋材应变和拉力会随之增大, 并且蠕变时间越长, 这种增大效应越明显;目前实际设计方法中对填土蠕变影响的考虑不足, 是偏于不安全的。
Abstract
Based on the finite element analysis of creep behavior of cohesive back-filled geosynthetic-reinforced soil retaining walls, the influences of the creep of back-filled soils on retaining wall were discussed and the creep interaction mechanism between back-filled soils and reinforcement material were investigated. It is found that when the creep rate of back-filled soils is larger than that of reinforcement material, the tension in the reinforcement material will increase continuously rather than relax after the wall is constructed. The lateral displacement of the wall, the stress and tension in the reinforcement material increase as the creep rate of the back-filled soil increases; the effect is more remarkable with the increase of creep time. However, current design methods do not properly take into account the adverse effects of back-filled soil creep which may be unsafe.
关键词
道路工程 /
加筋土挡土墙 /
有限元分析 /
蠕变 /
土工合成材料 /
标准固体模型
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Key words
road engineering /
reinforced soil retaining wall /
finite element analysis /
creep /
geosynthetics /
standard solid model
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中图分类号：
U417.11
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参考文献
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脚注
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基金
国家自然科学基金项目(50408002)
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