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Large strain dynamic characteristics of quaternary alluvium sand with emphasis on empirical pore water pressure generation model
European Journal of Environmental and Civil Engineering ( IF 2.1 ) Pub Date : 2021-04-28 , DOI: 10.1080/19648189.2021.1916605
Angshuman Das 1 , Pradipta Chakrabortty 1
Affiliation  

Abstract

The present study focuses on the cyclic behaviour of cohesionless soil collected from the quaternary alluvium deposit at the Middle Ganga Plain (MGP). A series of strain-controlled cyclic triaxial tests have been carried out on collected soil samples at various effective confining stresses, shear strain amplitudes and motion frequencies to estimate the dynamic parameter at large strain. From the results, it has been shown that dynamic properties and liquefaction strength substantially affected by the shear strain amplitude of input motion. However, effective confining stress and motion frequency have no significant effect on dynamic properties and liquefaction strength at large strain. Regression equations have been developed for dynamic and liquefaction strength parameters for the studied soil. It has been found that the consideration of asymmetricity in the shape of hysteresis loops significantly influences the damping ratio estimation at a particular shear strain. Another novel aspect that has been presented in this study is the effect of effective confining stress on the EPWP model parameter F using a mathematical equation. The regression equation for model parameter F proposed in this study has been validated by predicting the maximum EPWP development of studied soil and other quarternary alluvium soils available worldwide.



中文翻译:

以经验孔隙水压力生成模型为重点的第四纪冲积砂大应变动力学特征

摘要

本研究的重点是从中恒河平原 (MGP) 的第四纪冲积层收集的无粘性土壤的循环行为。对收集的土样在各种有效围压、剪应变幅值和运动频率下进行了一系列应变控制循环三轴试验,以估计大应变下的动态参数。结果表明,动态特性和液化强度受输入运动的剪切应变幅度的影响很大。然而,有效围压和运动频率对大应变下的动态特性和液化强度没有显着影响。已经为所研究的土壤的动态和液化强度参数开发了回归方程。已经发现,考虑磁滞回线形状的不对称性会显着影响特定剪切应变下的阻尼比估计。本研究提出的另一个新方面是有效围压对 EPWP 模型参数的影响F使用数学方程。本研究中提出的模型参数F的回归方程已通过预测全球可用的研究土壤和其他季冲积土的最大 EPWP 发展得到验证。

更新日期:2021-04-28
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