Shigen-to-sozai, Vol.118, No.3,4, pp.157-164.
A Consideration on Behavior of Near-Surface Crack Growth in Rock Mass under Compressive Stress
Yoshiaki FUJIIa, Natsuo HORIBAb and Yoji ISHIJIMAa
| a. Graduate School of Engineering, Hokkaido
University b. Technical Research Institute, Nishimatsu Construction Co. Ltd. |
| Uniaxial compression, tests were carried
out on rock specimens which were modeled
oil a bench cut-quarry or cliffs of various
shapes in order to clarify behavior of near-surface
crack growth in rock mass. Exfoliations at
highly compressed parts and detachments of
convex parts as results of crack growth were
observed in the experiments. Numerical simulation
on crack growth based on 2D-DDM was carried
out in order to explain the experimental
results. The authors proposed a new criterion
for crack growth since predictions by using
widely known Sih's maximum tensile stress
theory were slightly different from the observed
results. The new method takes shear stress
as well as tensile stress near crack tip
into account and gave results that were similar
to the observation. series of compression tests on rock and mortar specimens having a slit or an initial crack was conducted in order to clarify tile applicability of the new method. Profiles of the most observed cracks were similar to predictions by the proposed method. |
| KEY WORDS: Near-Surface, Crack Growth, Rock Mass, Compression Test, Numerical Simulation |