| 强度折减有限元法在昆明新机场高填方边坡稳定分析中的应用 |
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| 引用本文： | 陈金锋,宋二祥,徐明.强度折减有限元法在昆明新机场高填方边坡稳定分析中的应用[J].岩土力学,2011,32(Z1):636-0641. |
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| 作者姓名： | 陈金锋 宋二祥 徐明 |
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| 作者单位： | 清华大学土木工程系;后勤工程学院建筑设计研究院 |
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| 基金项目： | 国家863计划资助项目(No.2007AA11Z113);国家自然科学基金项目(No.50978140);教育部博士点新教师基金项目(No.200800031061) |
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| 摘 要： | 介绍了碎石桩、强夯置换两种工程常用的山区高填方地基的处理方式。为了解不同地基处理方式下,山区机场高填方边坡的稳定性,采用强度折减有限元法及对比研究的手段对昆明新机场79-79′工程地质剖面处边坡的稳定性进行分析,而且将强度折减有限元与简化Bishop方法的计算结果进行对比。另外,对土体强度参数未折减时,不同地基处理方式下的边坡位移及剪应变也进行比较。结果表明:用碎石桩或强夯置换处理坡脚内地基的相对软弱土层,不仅能有效提高边坡安全系数,还能大幅度减小边坡的最大剪应变与最大位移;当边坡的最危险滑移面接近圆弧形时,强度折减有限元法与简化Bishop法计算所得安全系数与最危险滑移面均接近,且强度折减有限元法计算的安全系数略偏小,偏于安全;当中风化基岩上方覆盖土层深度大于强夯置换的有效处理深度时,用碎石桩处理原地基效果更优。
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| 关 键 词： | 高填方边坡 强度折减有限元法 稳定分析 对比研究 地基处理 碎石桩 强夯置换 |
| 收稿时间： | 2011-03-10 |
Application of strength reduction FEM to stability analysis of high fill slope in Kunming new airport |
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| CHEN Jin-feng,SONG Er-xiang,XU Ming.Application of strength reduction FEM to stability analysis of high fill slope in Kunming new airport[J].Rock and Soil Mechanics,2011,32(Z1):636-0641. |
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| Authors: | CHEN Jin-feng SONG Er-xiang XU Ming |
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| Institution: | 1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2. Institute of Architectural Design and Research, Logistic Engineering University, Chongqing 400041, China) |
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| Abstract: | Two kinds of ground treatment methods, gravel piles and dynamic replacement methods, are introduced, which are the most popular treatments at high fill foundation of airport in mountainous area. Comparative studies are carried out by the strength reduction FEM to analyze slope stability of 79-79? engineering geological profile in Kunming new airport under different ground treatments. Comparison between the outcome of stability analysis calculated by FEM and that calculated by simplified Bishop method is also implemented. Moreover, without reducing soil strength parameters, comparative studies of displacements and shear strains of the slope under different ground treatments are performed. The results show that the disposal of the relative soft foundation within slope toe with gravel piles or dynamic replacement method can not only enhance slope safety factor effectively, but also reduce maximum displacements and shear strains by leaps and bounds. Furthermore, safety factors and the most dangerous sliding surfaces calculated by the strength reduction FEM are close to that calculated by simplified Bishop method, when the most dangerous sliding surfaces are close to arc shape. And safety factors, calculated by the strength reduction FEM, are conservative as they are slightly smaller than those calculated by simplified Bishop method. Finally, gravel pile method is better than dynamic replacement method when the coating over moderately weathered bedrock is deeper than the treatment depth of dynamic replacement. |
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| Keywords: | high fill slope strength reduction FEM stability analysis comparative studies ground treatment gravel piles method dynamic replacement method |
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