细粒含量对饱和粉土动力特性影响试验研究
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摘要
通过对4种细粒含量不同的重塑粉土试样的动三轴试验,探讨了细粒含量对粉土轴向应变、动剪切强度、孔压的影响。在振动频率为1 Hz、均等固结条件下三轴试验结果表明:轴向应变都是在达到某一循环周数Np时发生突变,并且迅速达到破坏应变;循环周数相同时,该粉土的动剪切强度随着细粒含量的增加而增大,并且相同的细粒含量时动剪切强度与循环周数基本呈线性关系;Seed孔压模型拟合孔隙水压力表明,细粒含量低的孔压拟合效果较好。
Through dynamic triaxial test,under the condition of four kinds of fine particle content of remolded silt samples,the effects on the axial strain,dynamic shear strength and pore pressure of silt under different fine particle contents were investigated.In the condition of vibration frequency of 1 Hz and anisotropic consolidation,the results of triaxial test show that when axial strain rate get to a sudden change,the strain achieve the failure strain quickly.The dynamic shear strength of silt increases with the fine content at the same of damage cycle.Dynamic shear strength and damage cycle number present linear relations at the same fine particle content.Seed pore pressure model is adopted to fit the development of pore pressure curve,we find out that the fitting effect of low fine content pore pressure is better.
Through dynamic triaxial test,under the condition of four kinds of fine particle content of remolded silt samples,the effects on the axial strain,dynamic shear strength and pore pressure of silt under different fine particle contents were investigated.In the condition of vibration frequency of 1 Hz and anisotropic consolidation,the results of triaxial test show that when axial strain rate get to a sudden change,the strain achieve the failure strain quickly.The dynamic shear strength of silt increases with the fine content at the same of damage cycle.Dynamic shear strength and damage cycle number present linear relations at the same fine particle content.Seed pore pressure model is adopted to fit the development of pore pressure curve,we find out that the fitting effect of low fine content pore pressure is better.
引文
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[4]陈国兴,刘雪珠.南京粉质黏土与粉砂互层土及粉细砂的振动孔压发展规律研究[J].岩土工程学报,2004(1):79-82.
[5]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.
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