Dynamic response of the slope by the site of Jinsha River Bridge under the action of reservoir water and seismic force

作者：Chen, Zhu; Che, Ailan^*; Yan, Fei; Wen, Hai; Ge, Xiurun

来源：Chinese Journal of Rock Mechanics and Engineering, 2018, 37(1): 148-155.

DOI：10.13722/j.cnki.jrme.2017.0354

• Combined effect
• Reservoir water
• Seismic forces
• Shaking table tests
• Slope engineering

A large-scale model of shaking table test on the rocky slope with discontinuous rock joints is carried out to investigate the stability of rocky slope with complex geological structures. The dynamic response and failure mechanism of the rocky slope with discontinuous joints under the combined effects of reservoir water and seismic force were studied. The experiment simulates the rise and fall of the reservoir water by injecting water into and pumping water out the model box. The wave reflection created by the box wall is reduced by the wave absorbing device. The result shows that with the input of seismic wave, the cracks in slope under the reservoir water level expenses quickly. Under the same seismic wave input, the acceleration amplification effect of the slope for the high water level case is less obvious compared to the low water level case due to the presence of the water pressure. The infiltration of reservoir water aggravates the development of the slope cracks. The sudden drop of reservoir water level brings a greater amplification effect to the acceleration of slope surface, which is not positive to the stability of slope. The earthquake induces the cracks along the joints on the upper layer of the slope. The increase of the seismic force and the infiltration of reservoir water aggravate the development of the cracks and finally result in the appearance of the penetrating cracks. The interaction of the seismic force, infiltration of reservoir water and its sudden drop together lead to the overturn and sliding failure of the slope along its upper discontinuity.

• 出版日期2018
• 单位上海交通大学