Study on Influencing Factors of Unsaturated Loess Slope Stability under Dry-Wet Cycle Conditions

Jing, Jing; Hou, Jingming; Sun, Wei; Chen, Guangzhao; Ma, Yue; Ji, Guoqiang

doi:10.1016/j.jhydrol.2022.128187

Cited by 20 publications

(2 citation statements)

References 35 publications

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“…Nevertheless, the process of urban expansion and the implementation of LID stormwater systems in collapsible loess regions encounter a range of distinctive obstacles (Hu et al, 2021). Owing to the abundant pore structure and vertical joints present within the loess (Jing et al, 2022), as well as the shallow groundwater level in the loess region, the soil is susceptible to collapsing upon contact with water. This can result in calamities such as road collapse and tilting of houses (Yuan et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Simulation and Evaluation of Collapsible Risk of Low Impact Development Rainwater System in Collapsible Loess Area

Jing,

Hou,

Pan

et al. 2024

Preprint

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To assess the risk levels of collapse for various low-impact development (LID) measures used in constructing stormwater systems in collapsible loess areas, the high-efficiency and high-precision urban stormwater model (GAST) was used to analyze the risk of waterlogging. Combined with the time of waterlogging accumulation, a method is proposed to assess the collapse risk level of various LID measures by considering the correlation between the collapsibility coefficient and soil parameters. This method was then used to analyze the changing patterns of settlement risk levels in grassed swales and rain gardens under different rainfall return periods (P1=20a, P2=50a, P3=100a) and water accumulation durations (T1=0.5 day, T2=5 day). The findings indicate a direct correlation between the rainfall return periods and the level of risk for collapse. At P3=100a, 50% of the collapse risk level in the study region reaches level III. Nevertheless, when the water accumulation duration is 5 days, the percentage of places classified as category III increases to 75%. Although rain gardens are better than grass swales at storing water, they also increase the risk of collapse. Therefore, it is essential to carefully monitor the durability of rain gardens during long periods of frequent rainfall. The evaluation approach proposed in this research demonstrates a 75% accuracy rate, confirming it as an initial and reliable instrument for evaluating the risk associated with building low-impact development stormwater systems in collapsible loess areas. Moreover, it can be employed to conduct additional investigations of the collapsibility impacts of LID measures in places with collapsible loess.

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Section: Introductionmentioning

confidence: 99%

Simulation and Evaluation of Collapsible Risk of Low Impact Development Rainwater System in Collapsible Loess Area

Jing,

Hou,

Pan

et al. 2024

Preprint

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“…Heavy rainfalls can lead to deformation and strength degradation of soil, which is the main cause of slope instability in loess. WD cycling has also been shown to significantly deteriorate the mechanical properties and microstructure of loess, leading to loess sliding failure [9,10]. FT cycling is a specific form of temperature variation that involves ice crystal formation and melting which change the alignment of soil grains and complicate the variation pattern of the soil mechanical properties [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Loess in the Yili Region and Corresponding Degradation Mechanisms under Different Cycling Modes

Zhang,

et al. 2023

Water

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In the Yili region, China, complex environmental conditions induce repeated wet–dry (WD) and freeze–thaw (FT) cycles, deteriorating soil shear strength and producing frequent loess landslides. In this study, we collected soil samples from the Alemale landslide, Yili Prefecture and performed their triaxial shear tests with different numbers of WD, FT, and WD-FT cycles. In addition, we summarized the change mechanisms of loess mechanical properties and its deterioration, in the Yili region, under different cyclic effects. Subsequently, the test results under the three cycling modes were compared and analyzed, the differences in the deterioration effects of different cyclic conditions on loess were discussed in depth, and finally, a multiple linear regression model was established and the weights of single factors under the action of coupled cycles were analyzed. The results show the following: (1) Regardless of the confining pressure values, the principal stress evolution trends in soil samples under different cycling modes were generally consistent, i.e., after an initial increase, peak values were reached, followed by a final decline. (2) Under unconsolidated undrained (UU) conditions, shear strength values of all soil samples tested under the three cycling modes dropped after the first twenty cycles, exhibiting different evolution patterns. (3) Coupled WD-FT cycling most significantly promoted soil shear strength degradation, with less WD cycling effect, and FT cycling had the least significant effect; in all three modes, the first cycle had the highest contribution to this effect. From the perspectives of cohesion, angle of internal friction, and decay of shear strength attenuation, the coupled WD-FT cycling effect on soil shear strength could not be reduced to a simple single-factor addition–subtraction relationship. (4) Weight analysis of soil samples after WD, FT, and WD-FT cycling revealed that WD cycles in the coupled WD-FT cycling mode had the most significant impact on the shear strength attenuation of soil samples (contributing 57%), FT cycles had a medium impact (contributing about 33%), while the effect of the total number of cycles was negligible (about 10%). The research results provide experimental and theoretical bases for subsequent control of loess landslides.

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Strength deterioration of karst fillings under dry–wet cycles: Testing and modeling study

Liu

Yang²,

Zhang

et al. 2023

Bull Eng Geol Environ

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Study on Influencing Factors of Unsaturated Loess Slope Stability under Dry-Wet Cycle Conditions

Cited by 20 publications

References 35 publications

Simulation and Evaluation of Collapsible Risk of Low Impact Development Rainwater System in Collapsible Loess Area

Simulation and Evaluation of Collapsible Risk of Low Impact Development Rainwater System in Collapsible Loess Area

Shear Strength of Loess in the Yili Region and Corresponding Degradation Mechanisms under Different Cycling Modes

Strength deterioration of karst fillings under dry–wet cycles: Testing and modeling study

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