@Article{cmes.2020.012648,
AUTHOR = {Junfu Zhu, Qian Yin, Hongwen Jing, Xinshuai Shi, Minliang Chen},
TITLE = {Experimental and Numerical Study on Anchorage Strength and Deformation Properties of Blocky Rock Mass},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {125},
YEAR = {2020},
NUMBER = {2},
PAGES = {725--753},
URL = {http://www.techscience.com/CMES/v125n2/40315},
ISSN = {1526-1506},
ABSTRACT = {This study experimentally and numerically investigated the anchorage properties, bolt force evolution, deformation and stress fields of blocky
rock mass with various dip angles of joint surfaces under an applied axial
load. The results show that due to bolt reinforcement, the axial stress-strain
curves of anchorage blocky rock mass show typical strain-hardening characteristics, and compared with models without anchorage, the peak strength and
elastic modulus increase by 21.56% and 20.0%, respectively. With an increase
in axial stress, the lateral strain continuously increases, and restriction effects
of bolts reduce the overall deformation of model surfaces. The axial stressstrain curves of anchorage blocky rock mass in the simulations present a
“double peak strength” phenomenon due to bolt reinforcement, and the peak
strength, second peak strength, residual strength, surface displacement field,
as well as the principal stress fields all depend on the dip angles of joint surfaces. As a result of the bolt reinforcement effects, cone-shaped compression
zones are produced in the models, and compression zones of adjacent bolts
superimpose with each other to form anchorage belts, improving the overall
bearing capacity of anchorage models. Obvious stress concentration can be
observed at both bolt end and anchorage section. Not only the role of bolt
support transfers the blocky rock mass to be a three-dimensional stress state
through compression effects, but also it improves both tensile strength and
shear resistance of both joint surfaces and the overall blocky rock mass.},
DOI = {10.32604/cmes.2020.012648}
}