Abstract
A shaking table test was performed to study the dynamic response and failure modes of high slope. Test results show that PGA amplification coefficients increased with increasing elevation and the PGA amplification coefficient of the concave slope was slightly larger than that of the convex slope. The slope type affected the dynamic response of the slope. The elevation amplification effect of the concave slope under seismic load was more significant than that of the convex slope; thus, the concave slope was more unstable than the convex slope. Additionally, the PGA amplification coefficient measured on the slope surface was always larger than that inside the slope, and the data show an increasing trend with the broken line. The dynamic amplification effect of the high slope was closely related to the natural frequency of the slope. Within a certain range, the higher the frequency, the more significant the amplification effect. The dynamic failure process of concave and convex slopes was studied through tests. Findings indicate that the dynamic failure modes of the concave slope are characterized by shoulder collapse, formation of the sliding surface, and integral sliding above the slope line. Dynamic failure modes of the convex slope are mainly slips in the soil layer and collapse of the slope near the slope line.
Highlights
Southwest China is an earthquake-prone area, especially in Yunnan Province, a province with high earthquake occurrence
On July 22, 2013, a magnitude 5.9 earthquake occurred in Minxian, China, which triggered more than 2,000 slope damages [10]. erefore, slope stability has become a prominent technical problem in the construction of southwest Yunnan
Based on a field investigation of typical high slopes in southwestern Yunnan, we summarized the failure mechanism of model slopes via a shaking table test
Summary
Southwest China is an earthquake-prone area, especially in Yunnan Province, a province with high earthquake occurrence. Methods for studying seismic responses of slopes mainly include numerical simulation and model testing. Researchers have begun to use the shaking table model test to study dynamic slope response. Wang and Zhang used a vibration simulation test to study the dynamic stability of a rock slope [22]. Rough a large-scale shaking table test, Xu et al studied the dynamic response law of a slope [27]. Based on energy dissipation theory, Kokusho and Ishizawa studied the failure mechanism of slopes under seismic loads using a small-scale shaking table test, and the Newmark method was employed to calculate and analyze the failure mechanism [31]. Based on a field investigation of typical high slopes in southwestern Yunnan, we summarized the failure mechanism of model slopes via a shaking table test. On the basis of measured data, the effects of landform, slope type, elevation, and ground motion parameters on the dynamic response of the slope were analyzed in detail
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