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Computers and Concrete
  Volume 26, Number 3, September 2020, pages 239-255
DOI: http://dx.doi.org/10.12989/cac.2020.26.3.239
 


Numerical simulation and experimental investigation of the shear mechanical behaviors of non-persistent joint in new shear test condition
Dandan Wang, Guang Zhang, Vahab Sarfarazi, Hadi Haeri and A.A. Naderi

 
Abstract
    Experimental and discrete element method were used to investigate the effects of joint number and its angularities on the shear behaviour of joint\'s bridge area. A new shear test condition was used to model the gypsum cracks under shear loading. Gypsum samples with dimension of 120 mmx100 mmx50 mm were prepared. the length of joints was 2cm. in experimental tests, the joint number is 1, 2 and 3 and its angularities change from 0o to 90o with increment of 45o. Assuming a plane strain condition, special rectangular models are prepared with dimension of 120 mmx100 mm. similar to joints configuration in experimental test, 9 models with different joint number and joint angularities were prepared. This testing show that the failure process is mostly governed by the joint number and joint angularities. The shear strengths of the specimens are related to the fracture pattern and failure mechanism of the discontinuities. The shear behaviour of discontinuities is related to the number of induced tensile cracks which are increased by increasing the rock bridge length. The strength of samples decreases by increasing the joint number and joint angularities. Failure pattern and failure strength are similar in both of the experimental test and numerical simulation.
 
Key Words
    new shear test condition; joint number; joint angularities; discrete element method
 
Address
Dandan Wang: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, Hubei Province, China; Poly Xinlian Blasting Engineering Limited Corp., Guiyang, Guizhou Province, China
Guang Zhang: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, Hubei Province, China
Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran
Hadi Haeri: State Key Laboratory for Deep GeoMechanics and Underground Engineering, Beijing, 100083, China
A.A. Naderi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran
 

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