Experimental Study on Shear Strength Parameters of Round Gravel Soils in Plateau Alluvial-Lacustrine Deposits and Its Application

Kong, Zhijun; Guo, Yanhui; Mao, Shilin; Zhang, Wei

doi:10.3390/su15053954

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Kong al. [10] discussed the influence of different water contents on the shear strength characteristics of round gravel soil, and used the shear strength parameters of round gravel soil with different water contents to numerically simulate the excavation and support of super deep foundation pits.…”

Section: Introductionmentioning

confidence: 99%

Research on Deformation Safety Risk Warning of Super-Large and Ultra-Deep Foundation Pits Based on Long Short-Term Memory

Guo,

Li,

Yan

et al. 2024

Buildings

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This paper proposes transforming actual monitoring data into risk quantities and establishing a Long Short-Term Memory (LSTM) safety risk warning model for predicting the deformation of super-large and ultra-deep foundation pits in river–round gravel strata based on safety evaluation methods. Using this model, short-term deformation predictions at various monitoring points of the foundation pits are made and compared with monitoring data. The results from the LSTM safety risk warning model indicate an absolute error range between the predicted deformation values and on-site monitoring values of −0.24 to 0.16 mm, demonstrating the model’s accuracy in predicting pit deformation. Additionally, calculations reveal that both the overall risk level based on on-site monitoring data and the overall safety risk level based on predicted data are classified as level four. The acceptance criteria for the overall risk level of the foundation pit are defined as “unacceptable and requiring decision-making”, with the risk warning control scheme being “requiring decision-making, formulation of control, and warning measures”. These research findings offer valuable insights for predicting and warning about safety risks in similar foundation pit engineering projects.

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Section: Introductionmentioning

confidence: 99%

Research on Deformation Safety Risk Warning of Super-Large and Ultra-Deep Foundation Pits Based on Long Short-Term Memory

Guo,

Li,

Yan

et al. 2024

Buildings

Self Cite

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“…Ecemis and Karaman [19] and Monkul and Ozden [20] studied the effect of fine particle content on the mechanical properties of clayey sand and found that fine particle content has a significant impact on its compression performance and liquefaction resistance. Kong et al [21] conducted in-depth research on the shear strength of conglomerate soil under different water contents. A large-scale direct shear test was conducted on circular gravel soil in the plateau alluvial-lacustrine deposit, and the shear strength curves and water content curves of the circular gravel soil under natural and saturated conditions were obtained, providing a certain reference for optimizing engineering design parameters.…”

Section: Introductionmentioning

confidence: 99%

Research on Shear Strength Parameters of the Silty Fine Sand and the Rounded Gravel Layers in Nanning City

Yang,

Zhou

et al. 2023

Advances in Civil Engineering

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The silty fine sand and rounded gravel layers are widely distributed in Nanning City, China. Due to the low clay content, the silty fine sand and rounded gravel layers are prone to disturbance during sampling and transportation, which affects the shear strength test results. The reasonable determination of their shear strength is significant and imperative to the project. The rail transit project in Nanning is under large-scale construction. This work obtained the shear strength of the silty fine sand and the rounded gravel layers by conducting laboratory tests on undisturbed samples from deep foundation pits, combined with large-scale direct shear in situ tests. In addition, geotechnical investigation reports for typical projects in Nanning City were compiled, and the test data for the silty fine sand and the rounded gravel layers were comparatively analyzed using the empirical value. The results show that the shear strength test values of the fine sand layer are consistent with the current standard empirical values, and empirical values can be used for reference. The shear strength test value of the rounded gravel layer has significantly improved compared to the current standard empirical value, with a cohesion (c) value of 0–6.8 kPa and an increase in internal friction angle (φ) of 0%–12.5%. It is recommended to determine the shear strength of the rounded gravel layer based on the actual situation.

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Experimental study and model prediction of the influence of different factors on the mechanical properties of saline clay

Cheng,

Zhang,

Shi

et al. 2024

Preprint

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Water conveyance open channels in cold and arid regions pass through several saline-alkali soil areas. Canal water leakage exacerbates the salt expansion traits of such soil, damaging canal slope lining structures. To investigate saline clay's mechanical property variations, this study conducts indoor tests, including direct shear, compression, permeation, and scanning electron microscopy analysis on soil samples from typical sites. The study aims to elucidate the impact of various factors on saline clay's mechanical properties from a macro-micro perspective and unveil its physical mechanisms. A prediction model is formulated and validated. Findings indicate: (1) Cohesion in direct shear tests exhibits a linear negative correlation with water content, a positive correlation with dry density, and initially decreases with salt content until 2%, after which it increases. The internal friction angle initially rises and then falls with increasing water content, reaching a peak at optimal water content, and gradually increases with dry density while exhibiting an initial decrease followed by an increase in salt content, stabilizing thereafter. Water content, dry density, or salt content chiefly affect cohesion by influencing electrostatic attraction, van der Waals force, particle cementation, and valence bonds at particle contact points. (2) Compression tests reveal a linear positive correlation between compression coefficient and water content, a negative correlation with dry density, and a stage-wise linear correlation with salt content, peaking at 2%. The compression index declines with increasing water content and dry density, following a trend similar to that of compression coefficient with salt content increase. The rebound index shows a linear negative correlation with water content and dry density, transitioning from a negative to a positive correlation at 2% salt content. Scanning electron microscopy analysis indicates particle flattening and increased aggregation with rising consolidation pressure, reducing compressibility. Large pores and three-dimensional porosity have the greatest influence on soil compressibility. (3) Permeability tests reveal an exponential negative correlation between permeability coefficient and dry density. As dry density rises, particle arrangement becomes denser, decreasing pore quantity, with small pores disproportionately impacting the permeability coefficient. Salinity increase initially boosts the permeability coefficient before a decline. The boundary point of 2% salt content divides salt ions' effect from promoting free water flow to blocking seepage channels, with micropores' pro-portion being the primary influencing factor. (4) Employing statistical theory and machine learning algorithms, dry density, water content, and salinity are used to predict mechanical index values. The improved PSO-SVR model exhibits high accuracy and general applicability. These findings offer insights for the construction and upkeep of open channel projects in arid regions.

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Experimental Study on Shear Strength Parameters of Round Gravel Soils in Plateau Alluvial-Lacustrine Deposits and Its Application

Cited by 3 publications

References 17 publications

Research on Deformation Safety Risk Warning of Super-Large and Ultra-Deep Foundation Pits Based on Long Short-Term Memory

Research on Deformation Safety Risk Warning of Super-Large and Ultra-Deep Foundation Pits Based on Long Short-Term Memory

Research on Shear Strength Parameters of the Silty Fine Sand and the Rounded Gravel Layers in Nanning City

Experimental study and model prediction of the influence of different factors on the mechanical properties of saline clay

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