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An alternative empirical function to predict air–water mixture bulk modulus for numerical modeling of liquefaction behavior of induced partially saturated sands
Bulletin of Earthquake Engineering ( IF 4.6 ) Pub Date : 2021-02-26 , DOI: 10.1007/s10518-021-01058-4
Seyed Mohsen Seyedi-Viand , E. Ece Eseller-Bayat

During the past decades, various soil improvement techniques have been developed to mitigate liquefaction hazards. One of the most newfound techniques is induced partial saturation (IPS). The capability of this method in liquefaction mitigation has been demonstrated through experimental and analytical research studies. This technique's main objective is to reduce the degree of saturation to convert fully saturated liquefiable sands into a partially saturated state and consequently reduce the potential of liquefaction occurrence. For numerical modeling of partially saturated sands' liquefaction behavior, the sand's main parameter that should be carefully determined is air–water mixture bulk modulus. A numerical model of a cyclic simple shear liquefaction box (CSSLB) on a shaking table was built to study the liquefaction response of induced partially saturated sands in the presented research. Primarily, a conventional equation was employed to predict air–water mixture bulk modulus of induced partially saturated sands, and the results of numerical liquefaction analysis were not much in accordance with those obtained from shaking table experiments. Then, experimental test results obtained from CSSLB were used to propose an empirical function to predict air–water mixture bulk modulus of induced partially saturated sands. It was shown that the new empirical function could predict the effect of entrapped air in excess pore water pressure generated in induced partially saturated sands during cyclic loading. Finally, this empirical function was validated with experimental results obtained from a laminar box on a shaking table and a centrifuge test. The results showed that the proposed empirical function could be considered as an alternative function in the numerical analysis of liquefaction response of induced partially saturated sands.



中文翻译:

预测空气-水混合物体积模量的替代经验函数,用于诱发部分饱和砂土的液化行为数值模拟

在过去的几十年中,已经开发了各种土壤改良技术来减轻液化的危害。最新发现的技术之一是感应部分饱和度(IPS)。通过实验和分析研究证明了该方法在减轻液化方面的能力。该技术的主要目的是降低饱和度,以将完全饱和的可液化砂转化为部分饱和状态,从而降低液化发生的可能性。对于部分饱和砂土的液化行为的数值模拟,应仔细确定砂土的主要参数是空气-水混合物的体积模量。建立了振动台上的循环简单剪切液化箱(CSSLB)的数值模型,以研究本文中诱导的部分饱和砂土的液化响应。首先,采用常规方程式来预测部分饱和砂土的气水混合物体积模量,而液化分析的结果与振动台实验的结果相去甚远。然后,从CSSLB获得的实验测试结果被用来提出经验函数,以预测诱发的部分饱和砂土的空气-水混合物的体积模量。结果表明,新的经验函数可以预测循环加载过程中截留的空气对诱导的部分饱和砂中产生的过高孔隙水压力的影响。最后,该经验函数通过在振动台上的层流箱和离心机测试获得的实验结果得到验证。结果表明,在部分诱发饱和砂土液化响应的数值分析中,所提出的经验函数可以作为一种替代函数。

更新日期:2021-02-26
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