铁路桥梁桥址边坡稳定性分析与防护  

Analysis and Protection on Slope Stability of Bridge Site in Railway

作　　者：刘兰英[1] 

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道标准设计》2012年第4期70-73,共4页Railway Standard Design

摘　　要：新建铁路某大桥沿山坡而建,桥址边坡由全风化和强风化浅粒岩组成,稳定性较差,考虑岩体质量分级选取物理力学参数,分别按滑坡、落石2种状况对桥址边坡稳定性进行计算分析。滑坡状况下,采用毕肖普条分法计算边坡弧状滑动的安全系数,结果显示2、3号墩边坡稳定性最差。落石状况下,采用ROCFALL模拟计算,结果表明,落石各墩边坡均有,1、2号墩影响最小;5号墩影响最大。综合2、3号墩应加重防护措施,1号墩防护最轻,设拦石墙即可。A certain bridge in a new railway line was located along hillside,and the side slope of the bridge site was made up of highly weathered and completely weathered leptite which the stability is bad.So the physical and mechanical parameters were selected based on rock mass classification.Further,slope stability of the bridge site was analysed respectively under the conditions of the landslide and the rockfall.On landslide condition,the safety coefficient of arc shape sliding was computed according to Bishop Method.The computation result indicated that the slope stability is worst in No.2 and No.3 piers.On rockfall condition,the ROCFALL simulation showed that there are rockfall in each pier's side slope,and the influence on No.1 and No.2 pier is least;influence on No.5 pier is highest.Therefore,the protective measures of No.2 and No.3 piers should be reinforced;No.1 pier's protection should be lightest that only the rockfall barrier is necessary.

关 键 词：岩质边坡 风化岩体 滑坡 落石 防护措施 

分 类 号：U443.8[建筑科学—桥梁与隧道工程]