【摘要】 通过将地震作用下边坡动孔隙水压力与液化抵抗率的简便关系式代入基于Newmark法的边坡永久位移计算式中,建立考虑动孔隙水压力影响的边坡永久位移简便计算方法。此外,基于此简便计算方法和拟静力法研究边坡坡比、坡高、地下水位变化、地震强度和频谱特性对边坡永久位移和安全系数的影响规律。研究发现,地下水对地震作用下边坡永久位移和安全系数的影响显著,在进行边坡稳定性分析时,地下水的影响不容忽略。实际计算中不考虑竖向加速度影响时,计算的结果偏小,会过高的评估边坡的稳定性。边坡坡高对边坡永久位移和安全系数的影响比坡比的影响更为显著。远场地震(T1-II-1)对边坡的永久位移和安全系数的影响要大于近场地震(T2-II-1)。最后采用非线性回归拟合方法,得到考虑动孔隙水压力影响的边坡永久位移与安全系数的关系式,通过求解边坡的安全系数,能快速计算出边坡的永久位移,对边坡基于性能的抗震设计理念的实施具有重要的参考价值。更多还原

【Abstract】 Pluging the relation between the pore water pressure and liquefaction resistance rate into calculation formula of the permanent displacement of slope based on Newmark method, a simple calculation method of the permanent displacement is established. The influence laws of slope ratio, height, underground water level, earthquake magnitude and seismic spectrum characteristics on permanent displacement and safety factor of the slope are studied. The results show that the influence of groundwater on permanent displacement and safety factor under earthquake is significant, which could not be neglected for the stability analysis of slope. If the vertical acceleration is not considered, the stability of slope will be overestimated. The influence of slope height on permanent displacement and safety factor is greater than the slope rate. The permanent displacement values under far field earthquakes(T1-II-1) are greater than that under near-field earthquake(T2-II-1). Finally using nonlinear regression fitting, the relation between the safety factor and permanent displacement considering the influence of groundwater are obtained. The permanent displacement of slope can be quickly solved by solving the safety factor and generating into the equation, which provides reference for the seismic design based on the performance.更多还原