| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 106 === Because the rock mass is often accompanied by the joint, the overall shear strength of the rock mass is affected not only by the strength of the material itself, but also by the existence of the joint. The influence of the existence of rock joints on the shear strength of rock mass has been proposed by Barton to estimate the shear strength of rock mass under the influence of joint. Where the joint surface roughness is an important influencing factor, and the joint roughness coefficient (JRC) is usually used to represent the roughness of the section.
Barton (1977) proposed the visual comparison method for the earliest assessment of the JRC method, but because of this approach is more subjective, in recent years, many scholars have proposed numerical quantitative objective way to assess JRC.
We use the PFC2D to simulate the rock joint model of the direct shear test. The numerical model of the direct shear test was established for different JRC of the randomly generated rock joint. The results obtained by this numerical model are compared with the empirical formula of shear strength proposed by Barton (1977).
After that, we simulate the direct shear test of the rock joint surface model for different intervals of JRC and compare the result with the empirical formula proposed by Barton. In addition, we use the plaster model for the actual direct shear test, and compared with the simulation results.
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