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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第3期    总第59期    2014年6月

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文章编号:1672-7029(2014)03-0009-08
预应力锚索框架梁加固滑坡的稳定性数值分析
戴自航1,2,石金华3,卢才金4

(1.福州大学 岩土工程研究所,福建 福州 350108;
2.卧龙岗大学 土木、采矿与环境工程学院,澳大利亚 新南威尔士洲 2522;
3.福州市建筑设计院,福建 福州 350001;
4.福建省交通规划设计院,福建 福州 350004
)

摘 要: 预应力锚索框架梁加固滑(边)坡是一典型的三维问题,为按三维问题进行稳定性分析,利用著名非线性有限元分析软件ABAQUS,在超级计算机上分别建立某高速公路路堑边坡采用单排和双排预应力锚索框架梁加固某古滑坡的三维实体有限元模型;提出考虑结构物与岩土体间黏着效应的莫尔-库仑黏着摩擦模型,模拟锚索锚固段灌浆体与其周围岩土体间的相互作用特性;以特征点的水平位移和强度折减系数关系曲线上曲率最大拐点,结合剪切塑性区临界贯通作为边坡失稳判据,对应的折减系数即为其稳定分析所得安全系数;揭示预应力锚索框架梁加固滑坡的机理。为岩土体与结构物复杂相互作用的三维问题分析提供参考。

 

关键字: 预应力锚索框架梁;滑坡稳定性分析;黏着摩擦;曲率最大拐点;剪切塑性区

Numerical analysis on landslides stabilized by framed beams with prestressed cables
DAI Zihang1,2, SHI Jinhua3, LU Caijin4

1. Institute of Geotechnical Engineering, Fuzhou University, Fuzhou 350108, China; 
2.School of Civil, Mining and Environmental Engineering, University of Wollongong, NSW 2522, Australia; 
3. Fuzhou Design Institute of Architecture, Fuzhou 350001,China; 
4. Fujian Design Institute of Communication, Fuzhou 350004,China

Abstract:A landslide (slope) stabilized by framed beams with prestressed cables is a typical 3D problem. In order to analyze its stability according to 3D problem, the 3D solid finite element models of an ancient landslide reinforced by one or two rows of framed beams with prestressed cables were established in the super computer by using the famous nonlinear finite element software ABAQUS. The Mohr-Coulomb''''s sticky friction model which is able to consider the sticky effect between structures and stratum was proposed and then used to simulate interaction behaviors between cable grouting bodies and soil-rock masses. The judgment criterion of slope instability was proposed to be determined by the turning points with maximum curvatures on the curves of horizontal displacement at the characteristic points together with strength reduction coefficients and combined with critical run-through zones of shearing plastic strain. In this case, the corresponding reduction coefficients are the safety factors of slope stability. The reinforcement mechanism of landslides and slopes stabilized by framed beams with prestressed cables is factually disclosed. The method can provide reference for the 3D analysis which involves the complicated interactions between rock/soil masses and structures.

 

Key words: framed beams with prestressed cables; landslide stability analysis; sticky friction; turning point with maximum curvature; shearing plastic strain zone

ISSN 1672-7029
CN 43-1423/U

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