摘要
以广东台山花岗岩残积土为研究所对象,采用共振柱试验方法对不同应力状态下花岗岩残积土的动剪切模量G和阻尼比D进行测试,并进行模型适用性分析.结果表明,动剪切模量G与应变γ的关系整体呈典型双曲线形态分布,围压σ′0对G-γ曲线的影响随γ增大逐渐减小;围压对D-γ关系的测试结果影响不明显;双对数模型能够反映最大剪切模量G max随围压的非线性递增趋势,工程中可以采取该模型对G max参数进行预测;小应变下,土体G-σ′0关系曲线较为接近,当γ>10-5时,各围压下G值衰减较快,工程参数选取时,应注意小应变范围内剪切模量随应力状态(深度)的变化差异.根据Martin-Davidenkov模型及选用的阻尼比经验公式对动力参数G/G max和D进行拟合分析,并给出了小应变下动力参数的推荐值,可为同类工程提供技术参考.
Taishan granite residual soil was taken as the research object,the dynamic shear modulus G and damping ratio D of granite residual soil under different stress states were studied and predicted by resonance column test.The model prediction analysis was carried out.The research shows that the test points of G-γpresent typical hyperbolic distribution,and the influence of confining pressure decreases with theγincreased.The influence of confining pressure on the relationship between D andγis not obvious.The double logarithmic model may reflect the relationship between G max andγ,the model can be used to predict the parameters of G max.Under the small strain,the curves of the relationship between G andγof the soil under different stress states are close to each other,when theγ>10-5,the G value decreases rapidly under various confining pressures.In the selection of engineering parameters,attention should be paid to the variation of shear modulus with stress state(depth)in small strain range.Martin-Davidenkov model and the empirical relationship between D andγhas been used to built the variation law of G/G max and D withγ,and the dynamic shear modulus and damping ratio of small strain range are used as recommended values.This study may provide technical reference for similar projects.
作者
尹松
张昊
李新明
白林杰
YIN Song;ZHANG Hao;LI Xinming;BAI Linjie(School of Civil Engineering and Architecture,Zhongyuan University of Technology,Zhengzhou 450007,China;College of Architecture and Civil Engineering,Xinyang Normal University,Xinyang 464000,China)
出处
《信阳师范学院学报（自然科学版）》
CAS
北大核心
2019年第4期683-688,共6页
Journal of Xinyang Normal University(Natural Science Edition)
基金
国家自然科学基金项目(51709290)
中原工学院自主创新应用研究项目(21001507)
关键词
花岗岩残积土
小应变
共振柱试验
剪切模量
阻尼比
granite residual soil
small strain
resonant column test
dynamic shear modulus
damping ratio
