SEISMIC DYNAMIC RESPONSE OF SAND SLOPE INDUCED BY VARIATIONS OF GROUNDWATER LEVEL
SONG Bo1，HUANG Shuai1，CAI Degou2，3，YE Yangsheng2，3
(1. School of Civil and Environment Engineering，University of Science and Technology Beijing，Beijing 100083，China；2. Railway Engineering Research Institute，China Academy of Rails Science，Beijing 100081，China；3. State Key Laboratory of Track Technology of High-Speed Railway，China Academy of Rails Science，Beijing 100081，China)
Abstract：Studying the seismic dynamic responses of slope where underground water exists has an important guiding significance for the slope engineering seismic design. Based on the finite element simulation and shaking table test，the influence laws of underground water level on the seismic dynamic responses of sand slope are studied. The results show that the peak acceleration dynamic amplification and the maximum horizontal displacement along the slope height increase with the rising of ground water level，and the maximum horizontal displacement with ground water is 2.35 times of that without water to the greatest extent. The rising of groundwater level leads to the decreasing of effective stress. Compared with no water of slope，the maximum effective stress is reduced by 63% under far field earthquakes in the full water depth of slope，while the maximum effective stress is reduced by 64% under near-field earthquakes，which are unfavourable for the stabilization of slope. There is a critical level of the influence of groundwater on the shear capacity of slope toe，when the groundwater level is above the critical water level，and the influence is gradually reduced. Based on the comparison of shaking table test and the numerical simulation，the accuracy of numerical simulations of this paper is verified.
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2014, Vol. 33 
