高地震烈度区夹软岩顺层高边坡处治分析  

Analysis on the Treatment of Bedding High Slope with Weak Interlayer in High Earthquake-intensity Areas

作　　者：孙巧 SUN Qiao(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430000,Hubei,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430000

出　　处：《工程技术研究》2023年第21期9-12,16,共5页Engineering and Technological Research

摘　　要：文章以云南某高速公路K20+380~K20+550左侧边坡为例,运用Geostudio计算了地震工况下的边坡稳定性,开展高地震烈度区夹软岩顺层高边坡处治分析,得出结论:边坡稳定性受距坡脚最近的软弱夹层控制;沿软岩顺层滑动稳定性系数随水平向地震动峰值加速度变化大致呈线性关系;采用拟静力法计算的抗震稳定性低于动力法,工程设计常采用静力法计算偏安全。最终提出了锚索桩、框架锚索联合的设计方案。Taking the left slope of an expressway in Yunnan from K20+380 to K20+550 as an example,this paper uses Geostudio to calculate the slope stability under seismic conditions,and carries out the treatment analysis of bedding high slope with weak interlayer in high earthquakeintensity area.It is concluded that the slope stability is controlled by the weak interlayer closest to the slope toe.The stability coefficient of bedding sliding along weak rock is roughly linear with the variation of horizontal seismic peak acceleration.The seismic stability calculated by the pseudostatic method is lower than that by the dynamic method,and it is safer to often use static method in engineering design.Finally,the design scheme of anchor pile and frame anchor cable is put forward.

关 键 词：高速公路 高地震烈度区 顺层边坡 软弱夹层 

分 类 号：U416[交通运输工程—道路与铁道工程]