| 路堑边坡施工过程离心模型试验及数值模拟研究 |
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| 引用本文： | 黄井武,陈晓平,周秋娟.路堑边坡施工过程离心模型试验及数值模拟研究[J].岩土力学,2010,31(Z2):422-427. |
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| 作者姓名： | 黄井武 陈晓平 周秋娟 |
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| 作者单位： | 1. 暨南大学 力学与土木工程系，广州 510632；2. 广东省水利电力勘测设计研究院，广州 510170 |
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| 基金项目： | 广东省水利科技创新项目（No. YSK2009-01）；广东省公路研发项目（粤公院［2007］研发05号）。 |
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| 摘 要： | 以粤北山区高速公路某路堑边坡为研究对象,通过离心模型试验及有限元模拟其施工过程,揭示开挖卸荷过程中的变形特性及稳定机制,探讨锚杆在边坡稳定中发挥的作用。结果表明,开挖卸荷引起松弛变形,变形量从坡顶向坡脚逐渐增大,从开挖临空面向坡体内部逐渐减小,最大值出现在坡脚,且在坡脚形成塑性区;锚杆支护后提高了加固部分土体的强度,减小了下级开挖引起的松弛变形,限制坡脚塑性区的发展。锚杆轴力沿杆体不均匀分布,其规律与锚杆长度有关,且一般下层锚杆轴力较上层大。锚杆支护不仅提高施工期的稳定,还可有效减弱应变软化对边坡长期稳定的不利影响,提高安全储备。研究成果对高速公路路堑边坡的设计及施工具有指导意义。
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| 关 键 词： | 路堑边坡 离心模型试验 数值分析 锚杆 |
| 收稿时间： | 2010-08-02 |
Centrifugal model test and numerical analysis of cutting slope during construction |
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| HUANG Jing-wu,CHEN Xiao-ping,ZHOU Qiu-juan.Centrifugal model test and numerical analysis of cutting slope during construction[J].Rock and Soil Mechanics,2010,31(Z2):422-427. |
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| Authors: | HUANG Jing-wu CHEN Xiao-ping ZHOU Qiu-juan |
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| Institution: | 1. Department of Mechanics and Civil Engineering, Jinan University，Guangzhou 510632，China； 2. Guangdong Hydropower Planning & Design Institute，Guangzhou 510170，China |
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| Abstract: | Regarding a cutting slope of express highway in the mountains of northern Guangdong as the research object, through centrifugal model test and finite element analysis, the deformation characteristics and the mechanism of slope stability during the construction process were revealed; the effect of anchor bolt on slope stability was discussed. Results show that: the excavation caused slack deformation, and the value of deformation increased gradually from top to toe and reduced gradually from free surface to interior. The maximum displacement and plastic zone appeared near the toe. After anchor bolt support, the strength of the supported soil was improved; the slack deformation caused by the lower stage excavation was reduced; and the development of the plastic zone in the toe was restricted. The axial forces distributed differently along the anchor, which was concerned with its length; and generally the axial force of lower anchor bolt was greater than the upper one. The anchor bolt not only improved the stability of slope during construction, but also effectively weakened strain softening on the adverse effects of long-term slope stability and improved the safety factor of slope stability. The results obtained have some guidance meaning for the design and construction of cutting slopes. |
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| Keywords: | cutting slope centrifugal model test numerical analysis anchor bolt |
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