首页|Experimental Study on Anisotropic Deformation Behavior and Microstructure Evolution of Red-Bed Mudstone

Experimental Study on Anisotropic Deformation Behavior and Microstructure Evolution of Red-Bed Mudstone

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  • NETL
  • NSTL
  • Korean Society Of Civil Engineers-Ksce
A detailed exploration about the development of the microscopic behavior of red-bed mudstones and exploration of their anisotropic deformation mechanisms in-depth can help to optimize the improvement of red-bed subgrade. To discuss the effects of single immersion and dynamic wetting-drying cycles, the Aramis system was used to monitor the mudstone deformation, whose results were compared with results of conventional deformation tests; the patterns of moisture migration was analyzed. Variations in mineral compositions, particle orientation and pore characteristics during cycles were investigated. The results show that after encountering water, red-bed mudstones swelled in axial and shrank in radial; the swelling first started around the initial fissures. During wetting-drying cycles, the decrease of equivalent montmorillonite content leads to the weakening of water absorption capacity and deformation capacity of the red-bed mudstone from the sixth wetting-drying cycle; moisture migration causes a directional shift of mudstone particles towards the direction of moisture migration, which triggers anisotropy of the red-bed mudstone deformation; moreover, wetting-drying cycles lead to the increase of pores and fissures inside the red-bed mudstone, with a more complex morphology and the increase of scattered detrital particles, which are the main reasons for the continuous deformation of the red-bed mudstone.

Red-bed mudstonesAnisotropic deformationMoisture migrationMineral compositionsParticle orientationPore characteristics

Zhishen Wang、Jiaotao Song、Enxi Qiu、Zhuang Peng、Mengfei Qu、Yong Li、Xusheng Wan、Zhongrui Yan、Jianguo Lu

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Dept. of School of Civil Engineering and Ceomatics, Southwest Petroleum University, Chengdu 610500, Sichuan, China

Dept. of School of Civil Engineering and Ceomatics, Southwest Petroleum University, Chengdu 610500, Sichuan, China||Liangshan Transportation Emergency Command Centre, Xichang 615000, Sichuan, China

Dept. of School of Civil Engineering and Ceomatics, Southwest Petroleum University, Chengdu 610500, Sichuan, China||State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (SKLCP), Chengdu 610059, Sichuan, China

Dept. of Sichuan Mianjiu Expressway Co., Ltd., Mianyang 627053, Sichuan, China

Dept. of Geotechnical and Structural Engineering Research Centre, Shandong University, Jinan 250061, Shandong, China

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2024

10.1007/s12205-024-0686-3

KSCE journal of civil engineering

KSCE journal of civil engineering

EISCI
ISSN：1226-7988
年,卷(期)：2024.28(12)
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