Multiscale Laboratory Study and Numerical Analysis of Water-Weakening Effect on Shale

Water-weakening effect is one of the most important factors inducing large deformation and stability problems of shale strata in the Huangjiazhai Tunnel. The influence of water on shale with various water contents and its mechanism still needs more study. In this paper, the X-ray diffraction and wat...

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Bibliographic Details
Published inAdvances in materials science and engineering Vol. 2020; no. 2020; pp. 1 - 14
Main Authors Zhu, Qinghua, Fang, Jinjin, Ren, Wentao, Liu, Shangge, Li, Zhen, Dun, Zhilin
Format Journal Article
LanguageEnglish
Published Cairo, Egypt Hindawi Publishing Corporation 2020
Hindawi
Hindawi Limited
Wiley
Subjects
Bond strength
Compression tests
Deformation effects
Engineering
Mathematical analysis
Mechanical properties
Mechanical tests
Minerals
Morphology
Multiscale analysis
Numerical analysis
Stone
Strata
Studies
Submerging
Tensile strength
Tension tests
Thickness
Water absorption
Water immersion
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Summary:Water-weakening effect is one of the most important factors inducing large deformation and stability problems of shale strata in the Huangjiazhai Tunnel. The influence of water on shale with various water contents and its mechanism still needs more study. In this paper, the X-ray diffraction and water absorption test were first conducted to determine the influence of mineral components on water-rock interaction. Then, a series of rock mechanical tests, including uniaxial compressive test, Brazilian disk test, and triaxial compressive test, were carried out on shale under dried condition, wetted condition with various water contents, and saturated condition. For the uniaxial compression, tension, and triaxial compression, the softening coefficient could reach 0.38, 0.63, and 0.52, respectively. Based on the macroscale experiments, a numerical case study of tunnel excavation was investigated to evaluate the water effect. Finally, with the aid of scanning electron microscope and failure morphology, the mechanism of water-weakening effect on shale was discussed from microscopic and macroscopic perspectives. The thickness of the double layer increases with the increase of water immersion time. This paper provides a set of useful data for reference in construction in shale strata, and a methodology to evaluate water-weakening effect through laboratory and numerical modelling approaches.
ISSN:1687-8434
1687-8442
DOI:10.1155/2020/5263431