Freezing Shear Characteristics and Failure Mechanism of Rock Joints with Different Opening Degrees and JRC

ce/papers, Год журнала: 2025, Номер 8(2), С. 577 - 589

Опубликована: Март 1, 2025

Abstract On the basis of rock‐coupled joints Jiangluling Tunnel on G214 line in permafrost region Qinghai, a freeze‐shear test was carried out to study shear characteristics and failure mechanism jointed rock with different opening conditions. Given 3D shape parameters joint surface frozen shearing its were revealed building theory adhesion between ice layer. Results showed that comprised four stages, compaction, sustained deformation, yielding post‐peak stage. As tension grows from 7 mm 13 mm, reduction peak stress at pressures for each specimen ranges 43% 81%, cohesion is 79‐98%. The angle internal friction has no significant pattern roughness. Tests degrees three modes damage pressures.

Язык: Английский

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A multi-field coupled model contained volumetric strain for unsaturated frozen soil and thermal-hydro-mechanical evolution characteristics of permafrost tunnel

Cold Regions Science and Technology, Год журнала: 2025, Номер unknown, С. 104510 - 104510

Опубликована: Апрель 1, 2025

Язык: Английский

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Study on unfrostered water content and strength characteristics of saturated sandstone during thawing process

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Май 21, 2025

After the construction of frozen wall vertical shaft is completed, it will undergo a long thawing process. Accumulation damage under load may lead to rupture walls and cause engineering accidents. The changes in mechanical properties during process rocks are key issues controlling stability walls. In view instability problem shaft, this article chooses saturated sandstone Cretaceous system as research object. Conduct triaxial compression tests different temperature confining pressure conditions. Obtain relevant parameters for analysis. And nuclear magnetic resonance technology was used detect pore water content at temperatures. results indicate that: ① At room temperature, mainly exists form free water, while low temperatures, adsorbed water. ② Compared with soil, also exhibit significant supercooling phenomena. ③ According variation unfrozen can be divided into three stages: freezing cessation (- 20 ℃ ~ - 6 °C), stable °C 2 rapid (-2 ℃). ④ As increases, closure level gradually initiation expansion levels decrease. ⑤ There an exponential relationship between peak strength sandstone, good correlation. show same trend change pressures. provide theoretical support experimental basis evaluating failure induced by

Язык: Английский

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Method for determining yield state and new solutions for stress and displacement fields of cold region tunnels under freeze-thaw cycles

Tunnelling and Underground Space Technology, Год журнала: 2024, Номер 155, С. 106139 - 106139

Опубликована: Окт. 20, 2024

Язык: Английский

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Method for Determining Yield State and New Solutions for Stress and Displacement Fields of Cold Region Tunnels Under Freeze-Thaw Cycles

Опубликована: Янв. 1, 2024

Язык: Английский

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Complex function stress solution of cold region tunnels under frictional contact condition of lining and surrounding rock with support delay

Applied Mathematical Modelling, Год журнала: 2024, Номер unknown, С. 115817 - 115817

Опубликована: Ноя. 1, 2024

Язык: Английский

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