Research on consolidation pressure correlated dynamic properties model of clay and its application
Research on consolidation pressure correlated dynamic properties model of clay and its application
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DOI：
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发表时间：
2010
影响因子：
1.5
通讯作者：
Wang Hai-dong
中科院分区：
文献类型：
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作者：
Wang Hai-dong
对某粉质粘土进行了不同轴向固结压力的循环单剪试验;以及不同固结压力下土体的非线性动力特性曲线Gd-γ d曲线和D-γ d曲线，其中Gd、γ d和D分别为动剪切模量、动剪应变比和阻尼比，结果表明，不同固结压力下土的均匀归一化动力特性曲线存在差异，沿着固结度的增加，随着压力的增大，Gd/ Gdmax-γ d曲线的衰减变慢;根据最大动剪切模量、最大阻尼比、参考剪应变与固结压力之间的试验关系，提出了一种新的固结压力相关的粘土动力特性曲线模型，并进行了固结压力相关模型在场地响应中的应用结果表明，土动力特性随固结压力的变化不仅会影响场地反应的幅值，而且会影响场地反应的频谱特性，且加铺层越厚，这种影响越明显。
Cyclic simple shear tests are conducted on a silty clay with different axial consolidation pressures;and nonlinear dynamic property curves,Gd vs.γ d curve and D vs.γ d curve,of soil under different test consolidation pressures,where Gd,γ d and D are dynamic shear modulus,dynamic shear strain radio and damping ratio respectively,are obtained.Results indicate that even normalized dynamic property curves of soil under different consolidation pressures exhibit differences.Along with the build up of consolidation pressure,the degradation of Gd/ Gdmax-γ d curve slows down;and the increase of D/ Dmax-γ d curve delays.Based on the experimental relationship between maximum dynamic shear modulus,maximum damping ratio,reference shear strain and the consolidation pressure separately,a novel consolidation pressure correlated dynamic property curve model of clay is proposed.Application of the consolidation pressure correlated model for site response is carried out.Results indicate that the property of soil dynamics varid with the consolidation pressure will affect not only the magnitude but also the frequency spectrum properties of the site response,and the thicker of overlay,the more obvious of the affects.