| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 83 === The mechanical properties of rock mass are influenced mainly by
geological, lithological, physical, mechanical and
environmental factors, such as preferred partical and crystal
orientation, stratificaion, foliation and joint. Even isotropic
rock material, the rock mass will behave anisotropically if cut
by regular joint or formed by sequent stratification. The main
purpose of this research is to study the mechanical properties
of interstratified rock mass. Rock-like material ( such as :
cement、microsilica、kaolinite ) will be used to obtain
interstratified block. Interstratified specimens with various
dip angle was drilled from interstratified block along
different direction. Both experimental and theoretical study
was carried out to investigate the mechanical behavious of
interstratified rock mass. To find the mechanical properties of
interstratified rock mass, a series of triaxial comprssion
testes was conducted. We used the failure criterion of
interstratified rock mass that developed by Tien, Y. M. et. al
(1994) to simulate interstratified rock mass strength
behavious. As the constitutive law, we used the constitutive
law of interstratified rock masses th by Salamon (1968) and the
flexible interface constitutive model for muti-layered rock
masses that developed by Lay (1994) to simulate elastic modulus
with different direction. By observation of the failure
condition of specimen after triaxial compression tests , the
failure modes of interstratified rocks can be classified into
six categories : (1)tensile failure mode (2)ductile
failure mode (3)sliding failure mode (4)shear failure
mode (5)buckling failure mode (6)local buckling failure
mode
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