2014, 6(1): 51-56.
基于强度折减法的某路堑边坡开挖支护优化分析
北京金土木软件技术有限公司，北京 100048 |
Optimizing Analysis on Excavation and Support of a Highway Cut Slope based on Strength Reduction Method
Civil King Software Technology Company Limited, Beijing 100048, China |
引用本文:
张海清, 刘志祥. 基于强度折减法的某路堑边坡开挖支护优化分析[J]. 土木建筑工程信息技术,
2014, 6(1): 51-56.
Citation:
Zhang Haiqing, Liu Zhixiang. Optimizing Analysis on Excavation and Support of a Highway Cut Slope based on Strength Reduction Method[J]. Journal of Information Technologyin Civil Engineering and Architecture,
2014, 6(1): 51-56.
摘要:以某山区高速公路路堑边坡工程为背景，通过PLAXIS有限元程序构建平面应变数值模型，借助程序内嵌的稳定性分析强度折减法，首先依据该边坡开挖现场揭露地层情况，对开挖稳定性及支护方案的加固效果进行了分析，可知对该边坡一、二级坡进行锚杆(索)框架加固即可满足整体稳定性要求；然后针对现场上覆强风化层厚度变化复杂，研究发现其对边坡稳定性的影响十分显著，可作为优化设计的主要研究对象；最后利用PLAXIS内置的参数敏感性分析功能，分析了强风化层和中风化层的强度参数c、φ值对边坡稳定性的影响，结果可确认，强风化层的c值对边坡稳定性影响最大。
Abstract: On the background of a mountainous area highway cut slope engineering, a plane strain finite element model is built by PLAXIS with its embedded strength reduction method for stability analysis.Firstly, the slope stability under excavation and reinforcement is analyzed according to the exposed stratigraphic, indicating that global stability requirement will be satisfied with frame anchor reinforcing the first two stage slopes. Secondly, after some studies it can be seen that overlying weathering layer thickness which significantly affects slope stability, a major research object for optimized design. Finally, the effect of the strength parameter c、φ, of strongly weathered layer and moderately weathered layer, on the slope stability is calculated using the built-in parameter sensitivity function of PLAXIS, which shows that c value of the strongly weathered layer has the most apparent influence on the result.
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