CENTRIFUGE MODELLING TESTS ON DYNAMIC FAILURE OF BEDDING ROCK SLOPES
LI Xianglong1，2，TANG Huiming1，WANG Lichao2
(1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；
2. China Institute of Geo-environment Monitoring，Beijing 100081，China)
Abstract：Two types of physical models of sliding rock slope，one with the intermittent rock planes alone and the other with both the rock planes and secondary rock joints were built using similar materials，and tested in the centrifuge machine under different seismic loads. The dynamic response and failure mechanism of the two slope models were then recorded and analyzed. The test results revealed that the dynamic response of the sliding rock slope was sensitive to the frequency of input seismic load and the characteristics of the joint structure inside. The more complex the joint structures are，the more complex the response to the input load frequency and the greater the topographic amplification effect. The dynamic stability and failure mechanism is strongly affected by the joint structure characteristics of the rock slope mass. The rock slope model with both intermittent rock bedding planes secondary rock joints has the lower dynamic stability and a shallower failure plane than the model with only the bedding planes. The tensile failures of the secondary rock joints during the dynamic failing process give rise to the internal crash and lead to the rock debris flow.
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2014, Vol. 33 
