JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2020, Vol. 37 ›› Issue (2): 141-146.DOI: 10.11988/ckyyb.20181166

• ROCK SOIL ENGINEERING • Previous Articles     Next Articles

Experimental Study on Mechanical Properties of Rock Containing Natural Micro-fractures

NIU Liang1, MU Rui2, CHEN Jun3   

  1. 1.College of Civil Engineering, Guizhou University, Guiyang 550025, China;
    2.Department of Military Installations, Army Logistics University of PLA, Chongqing 401311, China;
    3.Guiyang Engineering Corporation Limited, Power China, Guiyang 550081, China
  • Received:2018-11-01 Online:2020-02-01 Published:2020-04-09

Abstract: Uniaxial compression test, splitting test and SEM scanning test were performed to investigate the splitting mechanical properties and microstructure of rock containing natural microfractures. The failure modes and tensile strength of rock containing natural microfractures undergone uniaxial compression test and splitting test were analysed; the microstructure of the broken part of rock specimens of splitting failure mode was examined as well. In uniaxial compression test, the failure modes of rock specimens containing natural microfractures were mainly tension failure, shear failure along natural fracture surface, and tension-shear composite failure; the dip angle of natural microfracture had a remarkable influence on the tensile strength of rock which increased with the increase of dip angle. On the other hand, after splitting failure, the splitting mechanical properties were largely determined by the microstructure of natural microfractures which can be classified as three types, namely, root structure, fog area structure, and step structure, among which root structure had the most inferior mechanical properties whereas step structure was of good mechanical properties.

Key words: natural microfractures, dolomite, splitting test, SEM scanning test, failure mode

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