Answer Happy

一、Multiple choice questions (20 points, each is 4 points)
1. The strength of the rock mass is less than the strength of
intact rock is mainly due to ( ) A. The rock mass contains many
discontinuities B. The rock mass contains water C. Rock mass is
heterogeneous material D. The elastic modulus of intact rock is
larger than that of rock mass
2. The size effect of the rock mass means ( ) A. The mechanical
parameters of the rock mass have nothing to do with the size of the
test piece. B. The mechanical parameters of rock mass increase with
the increase of test piece. C. The mechanical parameters of rock
mass decrease with the increase of test piece. D. The strength of
the rock mass is smaller than that of the intact rock
3. The compressive strength of rock ( ) with the increase of
confining pressure. A. Increase B. Decrease C. Keep constant D.
Mutation
4. According to the Griffith strength theory, the failure of
brittle rock is ( ) A. Tensile failure B. Compressive failure C.
Shear failure D. Bending failure
5. It is known that the ratio between the uniaxial compressive
strength of saturated rock and the dry rock is 0.78. Then the rock
is with ( ) A. High softening, bad geological condition B. High
softening, good geological condition C. Small softening, good
geological condition D. Small softening, bad geological
condition