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首页> 外文期刊>Advances in civil engineering >Effects of Initial Shear Stress and Vibration Frequency on the Dynamic Pore-Water Pressure of Saturated Sands
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Effects of Initial Shear Stress and Vibration Frequency on the Dynamic Pore-Water Pressure of Saturated Sands

机译：初始剪切应力和振动频率对饱和砂动态孔隙水压力的影响

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摘要

The cyclic triaxial system is used to investigate the effects of confining pressure, initial shear stress, vibration frequency, and dynamic stress on the pore-water pressure characteristics of saturated sand in the Wenchuan area. Results show that the initial shear stress has a remarkable effect on the development of the dynamic pore-water pressure of saturated sand. The greater the initial shear stress, the slower the development curve of the pore-water pressure of saturated sand and the higher the number of cycles required to reach the same pore-water pressure. The larger the initial shear stress, the smaller the dynamic pore-water pressure when the sample is destroyed. Moreover, the maximum pore-water pressure ratio decreases linearly with the increase of the consolidation ratio. The normalised relationship curve between the dynamic pore-water pressure and failure time of vibration is consistent with the development law of the power function. The power function model parameters are affected by the initial shear stress and confining pressure. At the time of isotropic consolidation, the accumulation law of pore-water pressure presents a growth pattern of "fast-stable-intensified." A modified pore-water pressure model considering vibration frequency is proposed on the basis of the Seed pore-water pressure model, and the model parameters are linear with the vibration frequency. When the vibration frequency remains unchanged, the parameter does not change with the confining pressure and dynamic stress. This modified model can predict the change rule of pore-water pressure with the frequency under isotropic consolidation.
机译：利用循环三轴系统研究了围压，初始剪应力，振动频率和动应力对汶川地区饱和砂岩孔隙水压力特征的影响。结果表明，初始剪应力对饱和砂动态孔隙水压力的发展有显着影响。初始剪切应力越大，饱和砂的孔隙水压力的发展曲线就越慢，达到相同孔隙水压力所需的循环次数也就越多。初始剪切应力越大，破坏样品时的动态孔隙水压力越小。而且，最大孔隙水压力比随固结比的增加而线性减小。动态孔隙水压力与振动失效时间之间的归一化关系曲线与幂函数的发展规律一致。幂函数模型参数受初始剪应力和围压的影响。在各向同性固结时，孔隙水压力的累积规律呈现出“快速稳定-强化”的增长模式。基于种子孔隙率，提出了一种考虑振动频率的修正孔隙水压力模型。水压模型，模型参数与振动频率成线性关系。当振动频率保持不变时，该参数不会随围压和动应力而变化。该修正模型可以预测各向同性固结下孔隙水压力随频率的变化规律。

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  • 来源
    《Advances in civil engineering》 |2018年第10期|6124809.1-6124809.13|共13页
  • 作者

    Zhang Jian; Cao Jiuting; Huang Sijie;

  • 作者单位

    Nanjing Inst Technol, Sch Architectural Engn, Nanjing 211167, Jiangsu, Peoples R China;

    Jiangsu Zhongshe Grp Co Ltd, Wuxi 214072, Peoples R China;

    Tianjin Res Inst Water Transport Engn, Tianjin 300456, Peoples R China;

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  • 正文语种 eng
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