The variable-mass seepage law of broken porous rock: an experimental study

Wang, Yingchao; Fan, Chen; Li, Xiaozhao; Yin, Xin; Lei, Yu

doi:10.1080/19475705.2020.1821791

Cited by 11 publications

(10 citation statements)

References 14 publications

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“…is indicates that the development of the soil deformation field will further influence the development of the temperature field. With the development of the thaw settlement, the thermal conduction path between the temperature boundary of the embankment and the subsurface soil will be shortened, and the thaw speed of the soil will also be accelerated [27][28][29][30][31].…”

Section: Results and Analysismentioning

confidence: 99%

Nonlinear Analysis of the Thaw Settlement in Ice-Rich Embankments

Yang

Peipei

Cai

2021

Mathematical Problems in Engineering

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In this paper, the law of ice-rich permafrost embankment thaw consolidation is studied based on three-dimensional nonlinear large strain thaw consolidation theory. To avoid problems associated with numerical simulation efficiency and stability when a nonlinear stress-strain relationship is employed, a segment interpolation function is used to implement the nonlinear relationship between the compression modulus and the void ratio, and the corresponding simulation strategy is proposed. Through a comparison of the monitoring and calculated results, it is indicated that the calculation accuracy on ice-rich embankment thaw settlement can be notably improved after nonlinear theory is implemented with the proposed numerical simulation method. A further analysis of the calculated results indicates that the interactive effects between the thermal and mechanical fields can be more reasonably described by nonlinear theory than by linear theory. It is also determined that the postthaw pore water in the shallow embankment dissipates in the early operation period, while in the following long operation period, the development of the permafrost embankment thaw settlement is mainly due to the dissipation of newly postthaw pore water at the thaw depth or the permafrost table. This is one of the main differences in the law of permafrost embankment thaw settlement compared with that of unfrozen embankments.

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Section: Results and Analysismentioning

confidence: 99%

Nonlinear Analysis of the Thaw Settlement in Ice-Rich Embankments

Yang

Peipei

Cai

2021

Mathematical Problems in Engineering

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“…Molecular diffusion occurs via the random thermal motion of molecules and is positively correlated with the thermodynamic temperature [20]; thus, the saturation of the porous medium and the permeability K int [34] can be written as follows: where D e0 is the reference value of the molecular diffusion coefficient and K int0 is the reference permeability. Sodium-based GMZ bentonite adsorbs radionuclides through ion exchange reactions and surface coordination reactions [43,44]; the adsorption of Eu(III) in GMZ can be described by the Freundlich equation:…”

Section: Appendixmentioning

confidence: 99%

The Healing Process of the Joints between Buffer Material Blocks and the Influence on Solute Migration

Zhou

Liu

et al. 2021

Advances in Civil Engineering

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A set of thermo-hydro-mechanical coupling control equations was established, and the healing process of the joints between Gaomiaozi bentonite (GMZ01) buffer material blocks and the influence of the joint parameters were numerically simulated. The calculations consider the effect of joints on solute migration, the permeability and thermal conductivity of the buffer material, and the evolution of the healing effect. The effects of the joint design parameters, including the type, number, width, splicing form, and average dry density of the joint, are investigated. Studies show that, under an external water head, the joints will become hydraulic priority channels due to their higher permeability, which will shorten the saturation time of the blocks. As the bentonite gradually saturates, the swelling force compresses the joint material. This action improves the overall uniformity of the buffer material and reduces the priority channel effect. Meanwhile, the final average permeability and diffusion coefficient of the buffer material are found to mainly depend on the average dry density of the buffer material. The higher the average dry density of the buffer material is, the lower the final average permeability and diffusion coefficient are, whereas the distribution of joints and the block splicing are less affected by the average dry density of the buffer material. The findings of this study can provide a reference for the design of bentonite buffer material blocks in the repository.

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“…Actually, the theory of displacement earth pressure means that there is a close association between the earth pressure (i.e., the stress in soil) and the induced displacement during the movement of the retaining structure, which also involves the coupling process of external force, seepage action [27,28], soil microstructure damage [7,29], and even thermal loading [23,30]. In the existing theory, the relationship between displacement and earth pressure is generally described from three aspects: (a) the displacement earth pressure curve is fitted according to the experimental data to obtain a certain functional relationship between earth pressure and displacement [31]; (b) the association between the internal friction angle and the displacement is obtained from the backfilling of retaining structure, to obtain the variation of earth pressure with the corresponding displacement; (c) in view of the stress-strain constitutive law of the soil behind the retaining structure, the calculation model of the relationship between displacement and earth pressure is established.…”

Section: Displacement Earth Pressure Theorymentioning

confidence: 99%

A Displacement‐Based Theory for Predicting the Support Force on the Shield Tunneling Surface in Sandy Soil Layers

Guang

Han

Zhang

et al. 2021

Advances in Civil Engineering

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Due to the poor stability of the loose sandy soil layer, if the support force is not properly controlled during the construction process of the shield tunnel using the earth pressure balance method, it is easy to cause the ground to collapse or uplift. Therefore, understanding the support force of the excavation surface of shield tunneling in sandy soil layer is very vital to ensure the stability of the excavation surface. Firstly, it is assumed that the damaged soil is a three-dimensional wedge and a modified three-dimensional wedge in the active and passive failure modes, respectively. The shallow soil pressure theory and the soil plastic limit equilibrium theory are derived by analyzing the stress distribution on the damaged soil. The equation for revealing the inner essence between the support force of the shield excavation surface and excavation surface displacement under the condition of sand-covered soil is used. Secondly, the numerical simulation method analyzes the displacement of the excavation surface when the support force changes under different working conditions, and the relationship curve between the excavation surface support force and the shield tunneling displacement is obtained. The comparison and analysis between the numerical simulation calculation and the theoretical analysis indicate that the deduced calculation equation for the excavation surface support force based on the displacement earth pressure is reasonable.

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The variable-mass seepage law of broken porous rock: an experimental study

Cited by 11 publications

References 14 publications

Nonlinear Analysis of the Thaw Settlement in Ice-Rich Embankments

Nonlinear Analysis of the Thaw Settlement in Ice-Rich Embankments

The Healing Process of the Joints between Buffer Material Blocks and the Influence on Solute Migration

A Displacement‐Based Theory for Predicting the Support Force on the Shield Tunneling Surface in Sandy Soil Layers

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