Abstract
Red-bed mudstone experiences periodic swelling and shrinkage behaviors due to alternating wetting and drying cycles, leading to a series of engineering disasters such as foundation settlement and excessive deformation of high-speed railway roadbeds and reservoir bank slopes. This paper examines the effect of cyclic wetting and drying on the swell–shrink deformation and cracking to simulate the time-dependent behavior of such rocks for high-speed railway subgrades. Red-bed mudstone specimens from the Upper Cretaceous Guankou Formation (K2g) of central Sichuan Basin, Southwest China, were subjected to laboratory tests under oedometric conditions. The swelling and shrinkage deformations in each wetting and drying cycle under different cycles were measured over time. A theoretical model with elastic and viscous elements connected parallelly was put forward, and the time-varying swelling strain was derived. The results showed that the swell–shrink strain and fractures mainly occurred in the first dry–wet cycle. With increasing number of cycles, the accumulated swelling deformation increased gradually due to the progressive evolution of the cracks, and the maximum swelling stress σm and swelling deformation modulus k increased, indicating an underestimation of the swelling potential in conventional swelling tests. The time correlation parameters of B and η also increased, verifying the significant time-dependent deformation of red-bed mudstone. The time-dependent swell–shrink behavior is an important factor in evaluating the long-term stability of rocks in deformation-sensitive engineering.
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The authors would like to thank all the reviewers who participated in the review.
Funding
This research was supported by the National Natural Science Foundation of China (Grant nos. 42293353, 51808458, and 42130719), the Natural Science Foundation of Sichuan Province (Grant nos. 2022NSFSC0403), and the Science and Technology Research and Development Plan of China National Railway Group Co., Ltd. (Grant no. K2019G045).
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ZZ: Data curation, formal analysis, investigation, validation, writing. QZ: Experiments, validation. LL: Experiments, formal analysis, investigation, writing. PW: Conceptualization, methodology. TL: Project administration, supervision. BY: Experiments. XF: Manuscript revision, supervision.
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Zhong, Z., Zhou, Q., Lyu, L. et al. Time-dependent swell–shrink behavior of red-bed mudstone under cyclic wetting and drying. Bull Eng Geol Environ 82, 470 (2023). https://doi.org/10.1007/s10064-023-03496-7
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DOI: https://doi.org/10.1007/s10064-023-03496-7