Prediction of the soil–water characteristic curves for the fine-grained soils with different initial void ratios

Zhai, Qian; Zhu, Yiyao; Rahardjo, H.; Satyanaga, Alfrendo; Dai, Guoliang; Gong, Weiming; Zhao, Xinlei; Ou, Yazhou

doi:10.1007/s11440-023-01833-4

Cited by 10 publications

(4 citation statements)

References 31 publications

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“…It is due to the relative movement of the water phase in the soil specimen. Similar changes can also be found in Tadepalli et al [54,55]. On the other hand, at each given gravimetric water content, as the temperature increases, the negative pore water pressure decreases, whereas the void ratio increases.…”

Section: Volume Change Of Soil Specimensupporting

confidence: 85%

“…where 𝐺𝐺 𝑠𝑠 is specific gravity, 𝜌𝜌 𝑑𝑑 is the dry density of compacted soil specimen, 𝑉𝑉 0 is the volume of soil specimen at an initial state, and ∆𝑉𝑉 is its volume change. Figure 8 shows the change in void ratio obtained from this study and Zhai's research for the soil specimens at steady state [54]. The numbers denote negative pore water pressure at that void ratio.…”

Section: Volume Change Of Soil Specimenmentioning

confidence: 73%

“…Fredlund's equation [47] of estimating the volumetric shrinkage curve is best fitted to the experimental data of soil specimens. The fitting parameters (A sh , B sh , and C sh ) in Fredlund et al's equation, the best fitted curves, and Zhai's fitted curve [54] are illustrated in Figure 8. The curve obtained in this study has the same trend as Zhai's curve.…”

Section: Volume Change Of Soil Specimenmentioning

confidence: 99%

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A Temperature-Controlled Apparatus for Gas Permeability under Low Gas Pressure

Wu,

Huang,

Liu

et al. 2023

Applied Sciences

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The measurement of soil gas permeability is influenced by the temperature and pressure fluctuation in the low gas pressure region. In order to investigate these influences, a soil temperature-controlled apparatus connected to a low-gas-pressure supply equipment is proposed in this study. The low constant gas pressure is supplied by two Mariotte bottles, by which the airflow rate is measured. Meanwhile, the soil specimen is controlled by a temperature-controlled apparatus. During the test, the negative pore water pressure and volume change of the soil specimen are measured. Through the temperature-controlled apparatus, it is observed that as the temperature increases from 25 °C to 60 °C, there is a corresponding increase in soil sample porosity by 5.4%, while the negative pressure of pore water decreases by 11.1%. This can be attributed to the reduction in the surface tension of contractile skin caused by elevated temperatures. Furthermore, due to variations in gas viscosity with temperature, there was a significant decrease in the gas flow rate by 50.5%. And, the relationship between permeability and volumetric gas content at different temperatures in low-pressure regions well confirms the existing power-law model. In addition, the existence of a temperature-independent critical negative pore water pressure is observed, beyond which the intrinsic permeability remains constant. At 36 kPa of negative pore water pressure, the intrinsic permeability at 60 °C exhibits an 81.8% reduction compared to that at 25 °C. This decline in intrinsic permeability can be attributed to a diminished pore connectivity, resulting from elevated temperatures.

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Section: Volume Change Of Soil Specimensupporting

confidence: 85%

Section: Volume Change Of Soil Specimenmentioning

confidence: 73%

Section: Volume Change Of Soil Specimenmentioning

confidence: 99%

See 1 more Smart Citation

A Temperature-Controlled Apparatus for Gas Permeability under Low Gas Pressure

Wu,

Huang,

Liu

et al. 2023

Applied Sciences

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“…Linear and nonlinear forms of the unsaturated soil strength formula can be distinguished [42]. And both forms of equations are employed in this paper to calculate the impact of matric suction on tunnel face safety in unsaturated conditions.…”

Section: Strength Theory Of Unsaturated Soilmentioning

confidence: 99%

Stability Analysis of Three-Dimensional Tunnel Face Considering Linear and Nonlinear Strength in Unsaturated Soil

Yang,

Liao,

Zhu

2024

Applied Sciences

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The shear strength of unsaturated soils exhibits significant nonlinearity, while previous studies often simplified it with linear strength models. The objective of this paper is to investigate the distinctions in the stability of three-dimensional (3D) tunnel faces when using linear and nonlinear strength models. A new 3D rotational failure mechanism and an extended form of the Mohr–Coulomb (M-C) failure criterion were integrated into the kinematically limited analysis (KLA) framework to describe the failure characteristics of tunnel faces. Subsequently, the factor of safety (FS) of the 3D tunnel faces was calculated using the strength reduction method (SRM). In the discussion section, the impacts of nonlinear shear strength, matric suction in the unsaturated soils, and the 3D geometric parameters of the tunnel on the stability of the tunnel face were analyzed. The outcomes indicate that, in unsaturated soil conditions, diverse nonlinear strength calculation models and soil types exert disparate influences on the FS of 3D tunnel faces. The main novelty of this study lies in establishing an effective method for assessing the stability of tunnel faces in unsaturated soils.

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