地震作用下动孔隙水压力对边坡永久位移影响的简便计算方法

发布时间：2019-01-12 08:37

【摘要】：基于转动平衡理论,提出了考虑地震作用下动孔隙水压力影响的边坡永久位移简便计算方法,并通过砂土边坡(长度×宽度×高度为1.96 m×0.96 m×1.20 m)的振动台试验进行了验证。结果表明:地下水对边坡动力特性影响较大,随着地下水位的升高,边坡的自振周期呈现增加趋势,水位1.0 m时边坡的自振周期是无水时的2.88倍;地下水位越高,地下水对边坡临界加速度的影响越显著,且当水位为1.0 m时边坡的临界加速度比无水时减小了28%;随着水位的升高,边坡永久位移均表现出增加的趋势,地震峰值加速度为2.0 m/s2时,水位1.0 m的永久位移是无水时的9.8倍;此外,随着地震峰值加速度的增加,边坡永久位移急剧增加,当地震峰值加速度为2.0 m/s2时,永久位移是地震峰值加速度为1.0 m/s2时的6.9倍。建议的简便方法与试验测得的边坡永久位移最大偏差在10%以内,验证了建议方法的可靠性。
[Abstract]:Based on the rotational equilibrium theory, a simple and convenient method for calculating the permanent displacement of slope considering the effect of dynamic pore water pressure under earthquake is presented. The results are verified by shaking table test of sand slope (length 脳 width 脳 height is 1.96 m 脳 0.96 m 脳 1.20 m). The results show that groundwater has a great influence on the dynamic characteristics of the slope. With the increase of the groundwater level, the natural vibration period of the slope increases, and the natural vibration period of the slope at 1.0 m water level is 2.88 times of that when the water level is 1.0 m. The higher the groundwater level is, the more significant the influence of groundwater on the critical acceleration of slope is, and when the water level is 1.0 m, the critical acceleration of the slope decreases by 28% compared with that of without water. With the increase of water level, the permanent displacement of slope shows an increasing trend. When the peak acceleration of earthquake is 2.0 m/s2, the permanent displacement of water level of 1.0 m is 9.8 times that of anhydrous. In addition, with the increase of the peak acceleration of the earthquake, the permanent displacement of the slope increases sharply. When the peak acceleration of the earthquake is 2.0 m/s2, the permanent displacement is 6.9 times higher than that of the peak acceleration of 1.0 m/s2. The proposed simple method is less than 10% of the maximum deviation from the measured permanent displacement of the slope, which verifies the reliability of the proposed method.
【作者单位】：北京科技大学土木与环境工程学院;中国铁道科学研究院铁道建筑研究所;
【基金】：国家高技术研究发展计划专项经费项目(2011AA11A102) 高速铁路轨道技术国家重点实验室开放课题基金项目(2012SKL01) 教育部海外名师项目(MS2011BJKJ005) 科技部科研院所技术研究专项基金项目(2012EG123027)
【分类号】：TU435

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