›› 2018, Vol. 39 ›› Issue (6): 2073-2081.doi: 10.16285/j.rsm.2017.1182

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Mechanical characteristics of salt rock based on mesoscopic tests and discrete element method

HU Wei-zhe1, XIE Ling-zhi2, 3, CEN Wang-lai3, YING Shi3, LUO Yun-chuan1, ZHAO Peng1   

  1. 1. College of Architecture and Environment, Sichuan University, Chengdu, Sichuan 610065, China; 2. Key Laboratory of Deep Underground Science and Engineering of Ministry of Education, Sichuan University, Chengdu, Sichuan 610065, China; 3. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan 610207, China
  • Received:2017-08-21 Online:2018-06-11 Published:2018-07-03
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51120145001, 51104102).

Abstract: The current macro-mechanical models of salt rock are usually phenomenological models, which cannot fully explain the true physical mechanism of mechanical deformation and failure of salt rock. Salt rock is a polycrystalline aggregate, which mainly consists of NaCl and a few amounts of impurities formed in the geological lithification process. Its deformation mechanism is largely controlled by mechanical properties of the grain and grain boundary. The microstructure of the grain in salt rock was obtained by scanning electron microscopy (SEM), and the micro/meso mechanical parameters of the grain and grain boundary were determined by molecular dynamics (MD) and nanoindentation technologies. Based on the numerical Voronoi polygon technology, a microscopic numerical model of salt rock was established by regarding grains of salt rock as deformable blocks. The discrete element method (DEM) was adopted to perform numerical simulation on the macroscopic behaviour of salt rock specimens under uniaxial compression and direct shear. Numerical results are in good agreement with macro-mechanical experimental results, which indicates that the method proposed on the micro/meso grains of salt rock and the DEM can describe macroscopic mechanical properties well based on physical microstructure of salt rock.

Key words: salt rock, discrete element method, molecular dynamics, micro/meso model

CLC Number: 

  • P 642.3

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