講演情報
[1515]Deformation and Failure of Kimachi Sandstone under Constant Strain Rate and Cyclic Loading
〇Wang Yueguang1, Fujii Yoshiaki1, Fukuda Diauske1, Kodama Jun-ichi1 (1.Hokkaido University)
司会: 木崎 彰久 (秋田大)
キーワード：
Deformation、Failure、Kimachi sandstone、Constant strain rate、Cyclic loading
Rock cliffs sometimes collapse without any triggering forces. Giant
earthquakes sometimes occur around neap tides. These phenomena suggest that
rock masses do not have to failure under large triggering forces. To figure out
the deformation and failure behaviors of rocks under varying stress level, a
series of uniaxial compression tests on Kimachi sandstone was carried out. In the
experiments, the constant loading rate of 1 ×10-5s-1 for 50 s and five
triangular waves consisting of 11×10-5 s-1 and -9×10-5 s-1 for 50 s, were
alternately applied to 20 specimens. Finally, 13 samples showed a stress drop
during constant strain rate loading, 3 during triangular loading and 4 during
triangular unloading. The possibility of specimens showing stress drop during
the constant strain rate is 7.4%, assuming a random process. It was thus not
statistically proved but the rock tended to break under constant strain rate
rather than large stress with high strain rate.
<a href="http://confit-fs.atlas.jp/customer/mmij2015a/pdf/1515.pdf" target="_blank"></a>
earthquakes sometimes occur around neap tides. These phenomena suggest that
rock masses do not have to failure under large triggering forces. To figure out
the deformation and failure behaviors of rocks under varying stress level, a
series of uniaxial compression tests on Kimachi sandstone was carried out. In the
experiments, the constant loading rate of 1 ×10-5s-1 for 50 s and five
triangular waves consisting of 11×10-5 s-1 and -9×10-5 s-1 for 50 s, were
alternately applied to 20 specimens. Finally, 13 samples showed a stress drop
during constant strain rate loading, 3 during triangular loading and 4 during
triangular unloading. The possibility of specimens showing stress drop during
the constant strain rate is 7.4%, assuming a random process. It was thus not
statistically proved but the rock tended to break under constant strain rate
rather than large stress with high strain rate.
<a href="http://confit-fs.atlas.jp/customer/mmij2015a/pdf/1515.pdf" target="_blank"></a>