New method for the mechanical characteristics of self-weight collapsibility testing of loess foundation based on centrifugal model test

Jin, Songli; Yan, Jie; Li, Le-chen; Wang, Bo; Wu, Shuaifeng; Sun, Liming

doi:10.1080/15376494.2022.2100022

Cited by 1 publication

(1 citation statement)

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“…These models can reflect the deformation of unsaturated loess caused by changes in stress state but cannot account for the effect of the infiltration process. Centrifugal model tests [34,35] and on-site water immersion tests [36,37] can provide accurate results for the water infiltration process and development of collapsing deformation of loess foundations; however, these methods require a long time and relatively high costs. The Duncan-Chang model considers the nonlinear and time-dependent nature of soil response by incorporating hyperbolic equations.…”

Section: Introductionmentioning

confidence: 99%

Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission Lines

Zhang,

Hu,

et al. 2023

Advances in Civil Engineering

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With the development of ultrahigh voltage transmission line construction in northwest China, an increasing number of overhead transmission lines are crossing the loess regions. Ensuring the stability of electricity transmission towers and mitigating the risk of collapse are crucial prerequisites for the construction of transmission lines. Taking the 750 kV demonstration electricity transmission line in Guanting–Lanzhou East as an example, representative loess samples were selected for compression and collapsing sensitivity tests. Four foundation treatment schemes were designed, and the wetting deformation characteristics were investigated through numerical simulation of the rainfall infiltration process. Corresponding optimisation schemes were proposed. The collapsing process was divided into four stages through laboratory collapsing tests. The relationship function between saturation and the Duncan–Chang model parameters of loess was established, which was introduced into the finite element model to consider the rainfall infiltration process. The analysis of the displacement field, and loess saturation field with time after rainfall infiltration for the four schemes showed that adding a lime-stabilised soil cushion layer and waterproof layer to the inclined column foundation had the best effect. Given that the design scheme needs to consider safety and economy, the thickness of the cushion layer was optimised, thereby reducing the use of lime-stabilised soil by 20%. Research findings provide meaningful guidance for the design of transmission tower foundations in loess areas.

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