摘要
依托渝怀铁路斜坡软弱地基路堤土工离心模型试验成果,利用Slide软件建立对应的计算模型,开展基于极限平衡法与概率分析的复式滑动研究;对比Slide模型结果与离心模型试验成果的差异,探讨斜坡软弱层厚度与内摩擦角变化对复式滑面的影响;开展斜坡软弱层内摩擦角变异性对稳定性与滑动模式影响的概率分析。Slide模型计算与离心模型试验具有互补性;在极限平衡法中,考虑复式滑面有利于提高设计的安全储备;斜坡软弱层内摩擦角偏小、厚度偏薄时更易出现复式滑动破坏;在极限平衡法中引入概率分析,可更好地反映斜坡软弱层内摩擦角的变异性。
With reference to results of geotechnical centrifuge model tests of embankment over sloped weak ground of the Chongqing-Huaihua Railway ,the corresponding computation model was established with Soft-ware Slide and study on composite slip was conducted with the limit equilibrium method （LEM ） and by analysis on probabilities .The results of the Slide model and geotechnical centrifuge model were compared and the influ-ence of the thickness and internal friction angle of the sloped weak layer on the composite slip surface was dis-cussed .Probability analysis was made to investigate the influence of the variability of internal friction angles of the sloped weak layer on the embankment stability and slip surface behavior .Slide model calculations and geotechnical centrifuge tests are complementary .When applying the limit equilibrium method ,consideration of the composite slip surface is in favour of improving the safety stock in design .Damages due to composite sliding are easier to occur when the internal friction angle gets smaller and thickness gets lower with the sloped weak layer .Introducing probability analysis into LEM can better reflect the variability of internal friction angles of the sloped weak layer .
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2014年第8期91-97,共7页
Journal of the China Railway Society
基金
中央高校基本科研业务费专项资金(SWJTU12CX067)
关键词
斜坡软弱地基路堤
极限平衡法
复式滑面
概率分析
embankment over sloped weak ground
limit equilibrium method
composite slip surface
probabili-ty analysis
