Abstract
Due to the particularity and complexity of loess, it is challenging to estimate its collapsible behavior numerically at present. This paper aims to propose a simplified approach, which is named as the modulus reduction method, to estimate the collapsible behavior of loess. For loess upon wetting, the modulus reduction method assumes that loess collapses as a result of strength reduction due to the additional stress induced by increasing bulk density. Thus, special attention is given to the confirmation and determination approaches of bulk density and deformation modulus of loess upon wetting. Subsequently, a comparative numerical analysis based on the modulus reduction method and the force-water equivalent method, which is commonly used for the analysis of negative skin friction on piles in collapsible soil, is investigated. It turns out that the result obtained by the modulus reduction method is more consistent with the collapse mechanism of loess compared with that derived by the force-water equivalent method. Finally, a case history concerning a published field test of loess upon wetting is studied, and the result shows that the simulated deformation characteristics by adopting the modulus reduction method agree excellently well with the measured data. The case study validates that the modulus reduction method is feasible to analyze the collapse of loess and suitable for the numerical simulation involving collapsible loess.
Highlights
As the essential collapsible soil, loess and its collapsibility are constantly concerned by engineers and researchers. ere are many methods that can be used to investigate the collapsibility of loess
From the perspective of mechanism and deformation characteristics of collapsible loess, a simplified method named modulus reduction method, which is based on the principle of strength reduction, is proposed in this paper to estimate the collapsible behavior of loess. e modulus reduction method simulates the loess collapse under overburden pressure by reducing the deformation modulus and increasing the bulk density
The feasibility of the modulus reduction method is first compared with the force-water equivalent method, which is commonly used in the negative skin friction (NSF) analysis of piles, based on the same numerical model. e results derived from the modulus reduction method are found to be more consistent with the mechanism of collapsible loess
Summary
Hua Wen ,1 Songyin Deng ,1 Wei Zhang ,2 Qiangong Cheng ,3 Jiujiang Wu ,1,4 and Dailin Hu 1. The modulus reduction method assumes that loess collapses as a result of strength reduction due to the additional stress induced by increasing bulk density. Us, special attention is given to the confirmation and determination approaches of bulk density and deformation modulus of loess upon wetting. A comparative numerical analysis based on the modulus reduction method and the force-water equivalent method, which is commonly used for the analysis of negative skin friction on piles in collapsible soil, is investigated. A case history concerning a published field test of loess upon wetting is studied, and the result shows that the simulated deformation characteristics by adopting the modulus reduction method agree excellently well with the measured data. E case study validates that the modulus reduction method is feasible to analyze the collapse of loess and suitable for the numerical simulation involving collapsible loess A case history concerning a published field test of loess upon wetting is studied, and the result shows that the simulated deformation characteristics by adopting the modulus reduction method agree excellently well with the measured data. e case study validates that the modulus reduction method is feasible to analyze the collapse of loess and suitable for the numerical simulation involving collapsible loess
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