Volume 24 Issue 3
Jun.  2016
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LI Dongsheng, LIU Dongsheng, HE Wenjun, HU Jianglei. 2016: EXPERIMENTAL STUDY ON THE EFFECT OF PARTICLE SIZE TO SHEAR STRENGTH OF WEATHERING GANGUE. JOURNAL OF ENGINEERING GEOLOGY, 24(3): 376-383. doi: 10.13544/j.cnki.jeg.2016.03.006
Citation: LI Dongsheng, LIU Dongsheng, HE Wenjun, HU Jianglei. 2016: EXPERIMENTAL STUDY ON THE EFFECT OF PARTICLE SIZE TO SHEAR STRENGTH OF WEATHERING GANGUE. JOURNAL OF ENGINEERING GEOLOGY, 24(3): 376-383. doi: 10.13544/j.cnki.jeg.2016.03.006

EXPERIMENTAL STUDY ON THE EFFECT OF PARTICLE SIZE TO SHEAR STRENGTH OF WEATHERING GANGUE

doi: 10.13544/j.cnki.jeg.2016.03.006
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  • Received Date: 2015-02-06
  • Rev Recd Date: 2015-04-24
  • Publish Date: 2016-06-25
  • The distribution of coal gangue particle size along the vertical profile shows obvious regularity after been abandoned. Based on field gradation, the indoor direct shear tests of three grading weathering gangues in different moisture content were completed, the test results indicate that the stress-strain relationship of weathering gangue samples is from the strain softening to the strain hardening gradually with the increase of moisture content. The effect of gradation to shear strength of weathering gangue is difference in different moisture content, the backbone formed by coarse particles has an prominent influence to the internal friction angle of weathering gangue in low sample moisture content, but with the increase of moisture content, the effect of fine particle state is even more prominent. Along with the increase of moisture content, the cohesive force values among three grading coal gangues are close to accordance, but the declining rate of internal friction angle is obvious different, when the moisture content reaches saturation, the values of internal friction angle has dropped to near zero, at this time the shear strength of weathering gangue is mainly composition by its internal cohesive force.
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