ABSTRACT:

To study the dynamic response characteristics of supporting structure for homogeneous slope under earthquake, a small shaking table test of slope made of silica gel is designed at a geometric scale of 1:15. From the test, we conclude that, for a slope supported with framed anchors, its anti-seismic effect is different under different dynamic loading. For this slope model, the damage by the sine wave with low frequency is more serious than that caused by the sine wave with high frequency and its natural frequency. The anchor bars are forced alternately with tensile and press when loaded, so it is easy to cause damage to the bond between the anchor bar and the grouted body, and the bond between grouted body and slope. Under different dynamic loads, the law of load transferring to anchors in different rows is various. Sometimes the load on the upper anchor and the low anchor are large, sometimes that on the upper anchor is the smallest. So it is safe to allocate the load to each row anchor equally, and then increase the safety faction. The results show that the silica gel slope model can be used for studying the dynamic response of the slope supporting structural, and the model can be used repeatedly, which greatly reduces the cost of test. The maximum axial strain of anchor bar at the failure surface increase sharply. Under the same frequency, the axial strain of anchor bar increase with the acceleration of the input motion. Under the same acceleration, the maximum axial strains induced by low frequency and model's natural frequency are larger than other input emotions. During the destroyed stage of supported structure, the maximum axial strain of anchor bar at the failure surface increase dramatically by many times to that during elastic stage of the model slope.

1 INTRODUCTION

Engineering practitioners and researchers have shown a growing interest in analytical procedures for assessing the seismic stability of slopes. This is, in part, a reaction to the numerous landslides triggered by recent seismic events and the consequent damage to structures, transportation networks, lifelines and other critical facilities (Stewart et al. 1995, Sitar & Bardet 2001, Eberhart-Phillips et al. 2003, Wartman et al. 2003, Parise & Jibson 2000, Yang 2002, Chowdhury 1978, Huang 2009). It has been noted that moderate to large magnitude earthquakes often trigger thousands to tens of thousands of coherent landslides at distances as great as 500 km from the epicenter (Keefer 1984). The 2008 Wen-Chuan earthquake in Sichuan, China caused many slopes failure, and the amount of slide slope, collapse, and debris flow is about 30 to 50 thousands. Among these slope, the volume above one million m3 are several tens (Huang 2009). The disaster caused by earthquake is shocked to us. Therefore, seismic slope stability is worth studying.

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