地下水位变化对砂土边坡地震动力响应的影响研究

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摘要研究地下水作用下边坡的地震动力响应，对边坡的工程抗震设计具有重要的指导意义。基于边坡的有限元仿真分析和室内振动台试验，研究地下水位变化对边坡地震动力响应的影响规律，研究表明：沿着边坡高度的增加，最大水平加速度放大系数与最大水平位移随着地下水位的升高均呈现出增大的趋势，与无水时相比，地下水的存在使坡面水平位移最大增大2.35倍；水位的升高导致边坡有效应力降低，且边坡地下水位最高时在远场地震动作用下最大有效应力比无水时降低63%，近场地震动作用下降低64%，对边坡的稳定极为不利；地下水对坡脚抗剪能力的影响存在一个临界水位，超过此临界水位时其对边坡抗剪能力的影响逐渐减弱；将室内振动台试验结果与数值模拟的结果进行对比，验证文中数值模拟结果的准确性。

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关键词 ：边坡工程, 地下水位, 动力响应, 有效应力, 振动台试验

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.

Key words： slope engineering groundwater level dynamic response effective stress shaking table test

收稿日期: 2013-06-02

引用本文:

宋波1，黄帅1，蔡德钩2，3，叶阳升2，3. 地下水位变化对砂土边坡地震动力响应的影响研究[J]. 岩石力学与工程学报, 2014, 33(sl): 2698-2706.
SONG Bo1，HUANG Shuai1，CAI Degou2，3，YE Yangsheng2，3. SEISMIC DYNAMIC RESPONSE OF SAND SLOPE INDUCED BY VARIATIONS OF GROUNDWATER LEVEL. , 2014, 33(sl): 2698-2706.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/2698

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