常用的边坡地震位移简化算法对比

对于强震区的边坡工程抗震设计,国际主流规范允许采用位移分析的方法。由于地震的复杂性,选用什么样的位移计算方法至关重要。针对这个问题,对比了国际主流规范和手册常用的位移简化算法,包括AmbraseysMenu公式、Jibson公式、NCHRP 611公式、Bray and Travasarou公式、Makdisiseed法以及Shang-Yu HsiehChyi-Tyi Lee公式等,并采用SLIDE软件进行对比验证,分析了不同简化算法的优缺点。同时结合地震波特性,提出了1种基于阿里亚斯烈度的边坡残余位移计算表达式,并采用马尼拉某项目的多组地震波和不同地质不同边坡高度下的位移分析结果拟合了一个简化公式。结论可为类似条件下边坡工程地震位移简化计算提供一定的参考。

Comparison of commonly used simplified calculation methods for estimation of slope displacement under seismic condition

For the seismic design of slope engineering in strong earthquake areas,the displacement analysis methods are adopted widely in the international standards or guidelines.Due to the complexity of the earthquake,it is important to choose appropriate calculation method for displacement estimation.Based on the problems,this paper compares the several simplification methods for displacement calculation commonly used in international standards and manuals,including Ambrasys & Menu formula,Jibson formula,NCHRP 611 formula,Bray and Travasarou formula,Makdisi & seed method,and Shang-Yu Hsieh & Chyi-Tyi Lee formula.In addition,the SLIDE software is used to verify the advantages and disadvantages of different simplified calculation methods.Furthermore,combined with the characteristics of seismic waves,an equation for the slope residual displacement based on Arias intensity is proposed,and a simplified formula is fitted by using the results of displacement analysis of several groups of seismic waves and different geological slope heights of a project in Manila.The conclusions of this paper can provide reference for the simplified method of seismic slope displacement calculation under similar conditions.