| 条形荷载下不排水土坡破坏模式判定及极限承载力估算 |
| |
| 引用本文： | 刘文红,李同录,李萍.条形荷载下不排水土坡破坏模式判定及极限承载力估算[J].工程地质学报(英文版),2016,24(2):197-203. |
| |
| 作者姓名： | 刘文红 李同录 李萍 |
| |
| 作者单位： | 1.长安大学地质工程与测绘学院 西安 710054; |
| |
| 基金项目： | 国家自然科学基金(No.41372329,41272283),国家重点基础研究发展计划(973计划)项目(No.2014CB744701)资助 |
| |
| 摘 要： | 为了确定边坡放置地基的极限承载力,采用弹-理想塑性有限元,分析了不排水土坡(u=0)的坡肩上放置条形基础的地基极限承载力。结果表明,不排水土坡地基极限承载力仍可沿用Terzaghi水平地基极限承载力计算公式qu=cuNc。不考虑重度条件下,土坡地基的破坏模式类似于水平地基破坏模式,承载力系数Nc与极限分析法计算的结果一致;考虑重度条件下,可用土坡实际状态的Taylor数与其极限状态的Taylor数的差值N作为判别指标,当该值较小时将发生边坡破坏模式,较大时发生地基破坏模式,找出了两种破坏模式的N分界点,确定了Nc与N的关系,建立起坡肩作用条形荷载下不排水土坡极限承载力计算公式。
|
| 关 键 词： | 边坡 地基 极限承载力 破坏模式 有限元 |
| 收稿时间： | 2015-06-11 |
NUMERICAL ANALYSIS FOR FAILURE MODE AND ULTIMATE BEARING CAPACITY OF STRIPING FOOTINGS ON CREST OF UNDRAINED SLOPES |
| |
| Institution: | 1.School of Geological Engineering and Surveying, Chang'an University, Xi'an 710054;2.Key Laboratory for Geo-hazards in Loess Area of Ministry of Land and Resources, Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054 |
| |
| Abstract: | This paper estimates the ultimate bearing capacity of foundations on the slope crests. It uses the elasto-plastic finite element method(FEM).It simulates the striping footings on the crest of undrained slopes (u=0). The results show that the ultimate bearing capacity can be expressed as qu=cuNc. When the unit weight of soil is ignored, Nc estimated by FEM is highly agreeable with that calculated by limit analysis. The failure mode is similar to the foundation on the horizontal terrain. When the unit weight of soil is taken into account, the coefficient Nc can be reduced more. The parameter N is defined as the difference of the slope's stability number defined by Taylor from the slope's real state to the limit state. It can be used as determinant. The striping footing's failure can develop into whole slope failure when the N is smaller, as well as foundation failure when the N is bigger. The critical value of N for failure mode change is estimated. Then the Nc-N relationship is constructed. The equation for the ultimate bearing capacity of striping footings on the crest of undrained slopes is built. |
| |
| Keywords: | |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《工程地质学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《工程地质学报(英文版)》下载免费的PDF全文 |
|
