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首页> 外文期刊>Canadian Geotechnical Journal >Influence of state and compressibility on liquefied strength of sands
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Influence of state and compressibility on liquefied strength of sands

机译：状态和可压缩性对砂土液化强度的影响

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摘要

Critical-state soil mechanics is a useful framework to understand sand behavior. In this paper, a relationship is developed for estimating undrained critical shear strength of sands based on the critical-state framework. The application of this relationship is demonstrated by comparison with laboratory test results and sand liquefied strength from field liquefaction flow failure case histories. Using this relationship, the effects of effective stress variation and density on undrained critical shear strength are studied for different combinations of critical-state line parameters corresponding to several reference sands. The parametric study indicates that depending on sand void ratio, undrained critical shear strength may increase, remain the same or decrease as sand shearing-compressibility (represented by the slope of the critical-state line) increases. The underlying mechanisms of field failures in dense sands and reverse behavior of compressible sands are explained through this relationship. It is suggested that the critical-state parameter alone is insufficient for describing the behavior of liquefiable sands and sand shearing-compressibility should be also taken into account for estimating undrained shear strength corresponding to the changes in density and effective confining stress.
机译：临界状态土壤力学是了解砂土行为的有用框架。本文建立了一种基于临界状态框架的砂土不排水临界剪切强度估算关系。通过与实验室测试结果和现场液化流失案例历史中的砂土液化强度进行比较，证明了这种关系的应用。利用这种关系，研究了有效应力变化和密度对对应于几种参考砂岩的临界状态线参数的不同组合的不排水临界剪切强度的影响。参数研究表明，根据砂的孔隙率，不排水的临界剪切强度可能会随着砂剪切压缩率（以临界状态线的斜率表示）的增加而增加，保持不变或减小。通过这种关系解释了致密砂岩中的现场破坏和可压缩砂岩的反向行为的潜在机理。建议仅使用临界状态参数不足以描述可液化砂的行为，并且还应考虑砂的剪切可压缩性，以估计与密度和有效围压变化相对应的不排水剪切强度。

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