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Chinese Journal of Rock Mechanics and Engineering. 2014, (S2) Core

RESEARCH ON MICRO-FRACTURE MECHANISM OF MUDSTONE AFTER WET-DRY CYCLESChinese Full Text

YANG Jianlin;WANG Laigui;LI Xilin;ZHAO Guochao;College of Mechanics and Engineering,Liaoning Technical University;College of Materials Science and Engineering,Liaoning Technical University;College of Architecture and Engineering,Liaoning Technical University;

Abstract: By X-ray diffraction,mechanical experiments of mudstone and three-dimensional laser topography measurement instrument, the mudstone was characterized to investigate the micro-fracture mechanism of mudstone after wet-dry cycles. A series of data were obtained,such as composition,mechanical strength,topography of mudstone in the process of wet-dry cycles. More attention was paid to the micro-fracture mechanism of mudstone in wet-dry cycles. Results show that:Some microcline generates kaolinite after dry mudstone becoming wet. The uniaxial compressive strength of dry mudstone is 5.31 MPa,and it decreases to 0 MPa when the mudstone is put into water. With the increase of the number of wet-dry cycles,the quantity and width of cracks increase. Water molecules enter the space between unit cells of illite clay grains and water films form on the surface of clay grains,when the mudstone is wet. Some second porosity generates because of the physical and chemical effects of water when mudstone becomes wet,and the volume of mudstone becomes large also. Some cracks form in localized surface areas enriching clay grains of mudstone due to the different contraction velocities between surface and inner. The quantities and size of cracks increase upon the increase of the times of wet-dry cycles. The sample fractures when the cracks penetrate the whole sample.
Keywords：

rock mechanics; mudstone; secondary porosity; wet-dry cycle; fracture; micro-mechanism;

  • DOI：

    10.13722/j.cnki.jrme.2014.s2.027

  • Series：

  • Subject：

  • Classification Code：

    TU45

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