Constitutive model for thixotropic fluid considering phase characteristics of liquefaction of saturated sand

WANG Zhihua; JI Zhanpeng; YI Ruibo; ZHANG Xinlei; GAO Hongmei; LIU Lu

doi:10.11779/CJGE20230294

Volume 46 Issue 11

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Chinese Journal of Geotechnical Engineering > 2024 > 46(11): 2275-2283. > DOI: 10.11779/CJGE20230294

WANG Zhihua, JI Zhanpeng, YI Ruibo, ZHANG Xinlei, GAO Hongmei, LIU Lu. Constitutive model for thixotropic fluid considering phase characteristics of liquefaction of saturated sand[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(11): 2275-2283. DOI: 10.11779/CJGE20230294

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Constitutive model for thixotropic fluid considering phase characteristics of liquefaction of saturated sand

WANG Zhihua^{1, 2,},
JI Zhanpeng^{1, 2},
YI Ruibo^{1, 2},
ZHANG Xinlei^{1, 2, ,},
GAO Hongmei^{1, 2},
LIU Lu^{1, 2}

1.
Research Center of Urban Underground Space, Nanjing Tech University, Nanjing 211816, China
2.
Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 211816, China

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Received Date: April 05, 2023

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Abstract

Reasonable evaluation of the property evolution of saturated sand during liquefaction and the dynamic response under cyclic loading is the key to solve the problem of large deformation of liquefied sand. Through the undrained cyclic triaxial tests on saturated sand, the dynamic response of saturated medium-density Nanjing fine sand during liquefaction process is analyzed, and its stage characteristics are discussed. The Gompertz function is introduced to describe the relationship between apparent viscosity and pore pressure ratio, and an improved thixotropic pore pressure fluid model is proposed. The main conclusions are as follows : (1) According to the growth rate of pore pressure ratio, the liquefaction process is divided into four stages: solid stage, solid-fluid stage, thixotropic fluid stage and stable stage. (2) The relationship between apparent viscosity and pore pressure ratio is described by using the Gompertz function instead of the linear function. A modified thixotropic pore pressure fluid model considering stage characteristics is proposed, which provides a new unified method for solving seismic liquefaction problems.

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Constitutive model for thixotropic fluid considering phase characteristics of liquefaction of saturated sand

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