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循环荷载作用下土工格栅加筋黄土动力特性研究

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[目的]由于黄土所具有的结构疏松、抗剪性低，以及对水、力及震动都十分敏感等工程特性，故探究采用双向土工格栅对西宁地区黄土加筋前后土体动力性能的改善效果。[方法]采用GDS双向动三轴测试系统开展不同加筋层间距、不同围压、不同动应力幅值工况条件下加筋黄土的动三轴试验，分析循环荷载作用下加筋层间距对黄土动强度、动剪切模量、阻尼比等动力响应特性的影响，探讨分析加筋黄土动力响应特性的演化规律。[结果]结果显示:黄土动应变随着动应力的增大而增大，骨干曲线呈现应变强化型，并且骨干曲线随加筋层间距的减小逐渐由曲线型过渡为直线型;随着加筋层间距的减小，黄土强度随之增大，随着围压和加筋层间距的增加，黄土幅值剪应力明显增大，动剪应变减小，阻尼比明显减小。[结论]结果表明:围压和加筋层间距对加筋黄土的动力特性具有显著的增强作用，且存在一个最优加筋层间距。研究成果可为西宁地区加筋黄土道路设计提供参考依据。
Study on the dynamic characteristics of geogrid reinforced loess under cyclic loading
[Objective]Due to the engineering characteristics of loess,such as loose structure,low shear resistance and very sen-sitive to water,force and vibration,the bidirectional geoglids were used to improve the dynamic performance of soil before and after reinforcement of loess in Xining area.[Methods]Dynamic triaxial tests of reinforced loess under different conditions of rein-forced layer spacing,confining pressure and dynamic stress amplitude were carried out by GDS bidirectional dynamic triaxial test system.The effects of reinforced layer spacing on dynamic response characteristics of loess under cyclic load,such as dynamic strength,dynamic shear modulus and damping ratio,were analyzed,and the evolution law of dynamic response characteristics of reinforced loess was discussed.[Results]The result showed that the dynamic strain of loess increased with the increase of dy-namic stress,and the backbone curve showed a strain strengthening type.The backbone curve gradually changes from curvilinear to straight line with the decrease of the spacing between reinforced layers.With the decrease of the spacing between reinforced layers,the strength of loess increases.With the increase of confining pressure and the spacing between reinforced layers,the am-plitude shear stress of loess increases obviously,the dynamic shear strain decreases,and the damping ratio decreases obviously.[Conclusion]The result show that confining pressure and reinforced layer spacing significantly enhance the dynamic characteris-tics of reinforced loess,and there is an optimal reinforced layer spacing.The research result can provide reference for the road design of reinforced loess in Xining area.

geogriddynamic triaxial model testthe number of reinforced layersdynamic characteristicscyclic loaddeforma-tioninfluence factor

唐富春、张吾渝、唐鑫、刘成奎

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青海大学土木工程学院,青海西宁 810016

青海省建筑节能材料与工程安全重点实验室,青海西宁 810016

青海省建筑建材科学研究院有限责任公司,青海西宁 810008

青海省高原绿色建筑与生态社区重点实验室,青海西宁 810008

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土工格栅 动三轴模型试验 加筋间距 动力特性 循环荷载 变形 影响因素

国家自然科学基金青海省高原绿色建筑与生态社区重点实验室开放基金西宁碧胜房地产开发有限公司-湖南大学横向项目

52168054KLKF-2021-00720210097

2024

10.13928/j.cnki.wrahe.2024.03.013

水利水电技术(中英文)
水利部发展研究中心

水利水电技术(中英文)

CSTPCD北大核心
影响因子：0.456
ISSN：1000-0860
年,卷(期)：2024.55(3)
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