Physico-mechanical properties of loess-paleosol sequence from Q4 to Q1 strata in the Chinese Loess Plateau

Zhu, Jiaoqun; Yang, Shengqing; Wang, Tingting; Zhou, Guoquan

doi:10.1007/s10064-022-02899-2

Cited by 6 publications

(2 citation statements)

References 44 publications

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“…Furthermore, the greater clay contents and carbonate minerals in the paleosol (Tables 1 and 2) evidence that there are stronger cementation bonds in the paleosol, which make a heavy contribution to its shear properties [46]. Similar conclusions were discovered in the literature [47]. Different from our research, in previous studies, it was found that the internal friction angle of the paleosol was slightly smaller than that of the loess.…”

Section: Discussionsupporting

confidence: 87%

The Difference in Shear Behavior and Strength between Loess and Paleosol and Their Prediction of Unsaturated Strength

Liu,

Dai,

Huang

et al. 2024

Applied Sciences

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In recent decades, loess landslide events have attracted increasing attention in the South Jingyang tableland. To elucidate the mechanical mechanism of landslide initiation in the region, this work collected undisturbed loess and paleosol samples taking from the Q2 strata in the South Jingyang tableland. A range of direct shear tests were carried out to explore the strength evolution law of shear zone soil subjected to a varying initial moisture content. In addition, soil water characteristic curves (SWCCs) were also charted and used for predicting the unsaturated shear strength. The findings show that the basic physical properties of the paleosol are different from those of loess due to their different pedogenic environments. The normal stress level and initial moisture content jointly determine whether the shear behavior is strain hardening or strain softening. The shear strength and strength parameters evidently diminish with an increasing initial moisture content, and cohesion contributes to the vast majority of strength attenuation. Paleosol samples possess higher values in shear strength and strength parameters than loess samples due to their stronger inter-particle cementation. The predictive formulas of unsaturated shear strength for undisturbed loess and paleosol are proposed, respectively, based on the Vanapalli model, and the calculated values of the strength prediction model are in perfect agreement with the experimental values.

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Section: Discussionsupporting

confidence: 87%

The Difference in Shear Behavior and Strength between Loess and Paleosol and Their Prediction of Unsaturated Strength

Liu,

Dai,

Huang

et al. 2024

Applied Sciences

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show abstract

“…Loess typically contains large pores, vertical joints, and tubular pores. Additionally, it exhibits low strength, distinctive structure, and pronounced water sensitivity (Haeri et al 2019;Juang et al 2019;Zhu et al 2022b). The distinctive structure and intricate engineering properties of loess present numerous challenges for tunnel design and construction.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of ground surface settlement induced by shield tunnelling considering the soil parameter spatial variability in loess strata

Zhang,

Lai,

Wang

et al. 2024

Preprint

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Ground surface settlement (GSS) induced by shield tunnelling in loess soils represents a substantial challenge for geotechnical and structural engineers. Despite numerous attempts to predict GSS caused by tunnelling, considering the spatial variability of the soil parameters remains open. Thus, this study analysed the Lanzhou Metro Line 1 in China. In particular, the spatial variability of Young's modulus in the loess layer was simulated using random field theory coupled with finite difference analysis. Random fields were generated using the covariance matrix decomposition method, which is consistent with a specified numerical mesh. Subsequently, Monte Carlo simulations were performed using both deterministic and random field difference methods to explore the effect of horizontal scale fluctuations due to shield tunnelling on the ground motion. The results indicated that Young's modulus of loess exhibited a normal distribution. The vertical scale of fluctuation of Young's modulus in the loess layer spanned from 1.32 m to 1.51 m. These findings demonstrate that random field analysis can comprehensively characterise the trend, magnitude and fluctuation range of the GSS. Moreover, the findings indicate that GSS is underestimated when neglecting spatial variability compared with traditional deterministic analysis.

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Microscopic mechanisms of shear strength variation in acid- and alkali-contaminated loess

Liu,

Ye,

Long

2023

Environ Earth Sci

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Physico-mechanical properties of loess-paleosol sequence from Q4 to Q1 strata in the Chinese Loess Plateau

Cited by 6 publications

References 44 publications

The Difference in Shear Behavior and Strength between Loess and Paleosol and Their Prediction of Unsaturated Strength

The Difference in Shear Behavior and Strength between Loess and Paleosol and Their Prediction of Unsaturated Strength

Numerical analysis of ground surface settlement induced by shield tunnelling considering the soil parameter spatial variability in loess strata

Microscopic mechanisms of shear strength variation in acid- and alkali-contaminated loess

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