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Volume 22 Issue 3
Jun 2011
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Journal of Earth Science  > 2011  >  22(3): 411-420.
Shigui Du, Yunjin Hu, Xiaofei Hu, Xiao Guo. Comparison between Empirical Estimation by JRC-JCS Model and Direct Shear Test for Joint Shear Strength. Journal of Earth Science, 2011, 22(3): 411-420. doi: 10.1007/s12583-011-0193-6
Citation: Shigui Du, Yunjin Hu, Xiaofei Hu, Xiao Guo. Comparison between Empirical Estimation by JRC-JCS Model and Direct Shear Test for Joint Shear Strength. Journal of Earth Science, 2011, 22(3): 411-420. doi: 10.1007/s12583-011-0193-6
shu

Comparison between Empirical Estimation by JRC-JCS Model and Direct Shear Test for Joint Shear Strength

doi: 10.1007/s12583-011-0193-6
  • 1.

    Zhejiang Industry Polytechnic College, Shaoxing 312000, China

  • 2.

    College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, China

  • 3.

    Jinhua University, Jinhua 321007, China

  • 4.

    Zhejiang College of Construction, Hangzhou 311231, China

Funds:

the National Natural Science Foundation of China 40672186

the National Natural Science Foundation of China 50809059

the Natural Science Foundation of Zhejiang Province, China Y505008

More Information
  • Corresponding author: Yunjin Hu, huyunjin@tsinghua.org.cn
  • Received Date: 13 Oct 2009
  • Accepted Date: 19 Mar 2010
  • Publish Date: 01 Jun 2011
    Abstract
  • In order to study the reliability of the empirical estimation of joint shear strength by the JRC (joint roughness coefficient)-JCS (joint compressive strength) model, natural rock joints of different lithologic characteristics and different sizes were selected as samples, and their shear strengths under dry and saturated conditions were measured by direct shear test and compared to those estimated by the JRC-JCS model. Comparison results show that for natural rock joints with joint surfaces closely matched, the average relative error of joint shear strength between empirical estimation and direct shear test is 9.9%; the reliability of the empirical estimation of joint shear strength by the JRC-JCS model is good under both dry and saturated conditions if the JRC is determined accounting for directional statistical measurements, scale effect and surface smoothing during shearing. However, for natural rock joints with joint surfaces mismatched, the average relative error of joint shear strength between empirical estimation and direct shear test is 39.9%; the reliability of empirical estimation of joint shear strength by the JRC-JCS model is questionable under both dry and saturated conditions.

     

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