EFFECTS OF CONTACT AREA ON STRESS WAVE PROPAGATION AND JOINT MECHANICAL PROPERTIES
LIU Tingting，LI Jianchun，LI Haibo，LI Nana
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：Joints always contact partly in nature. To study the effect of the contact area，the Hopkinson pressure bar test system was used to carry out the impact experiments on different specimens. In the experiment，the small samples were considered to represent the joints and the different contact areas were created by the different numbers of samples used in each experiment. The transmitting coefficient of wave propagation through joints was obtained. The experimental results showed a positive correlation between the contact area and the transmitting coefficient，and a negative correlation between the contact length and the transmitting coefficient. A formula of transmitting coefficient was obtained by fitting the experimental data considering the effect of the contact area. And the correlation of the closure of joints and the transmitting coefficient showed that the transmitting coefficient increased approximately linearly with the increase of the closure. The experiment did not simulate the real joints，but it revealed the influences of contact area on the transmission efficient and the mechanical properties of joint from another perspective.
王鲁明，赵 坚，华安增，等. 节理岩体中应力波传播规律研究的进展[J]. 岩土力学，2003，24(增2)：602-605.(WANG Luming，ZHAO Jian，HUA Anzeng，et al. The progress in study of regularity of a stress wave propagation in the jointed rock mass[J]. Rock and Soil Mechanics，2003，24(Supp.2)：602-605.(in Chinese))
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2014, Vol. 33 
