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中南大学学报(自然科学版)

Journal of Central South University

第43卷    第5期    总第213期    2012年5月

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文章编号:1672-7207(2012)06-1908-06
加筋土挡墙稳定性分析的点安全系数法
杨果林,刘泽

(中南大学 土木工程学院,湖南 长沙,410075)

摘 要: 采用点安全系数法分析加筋土挡墙的稳定性。在理论分析的基础上,推导岩土体、筋材、筋土界面的点安全系数以及筋材抗拉和抗拔安全系数的计算方法,给出点安全系数法在FLAC3D软件中实现的步骤和FISH命令,并结合工程实例,对比分析强度折减法(SSR)与点安全系数法的差异。研究结果表明:采用点安全系数法不仅可以获得挡墙内各部位的安全状态,而且可以分析筋材的抗拉和抗拔稳定性,便于对影响挡墙稳定性的薄弱环节进行分析,实现规范所要求内外部稳定性计算;而强度折减法主要适用于分析挡墙的整体稳定性;点安全系数法比强度折减法的计算效率高。

 

关键字: 加筋土挡墙;稳定性;点安全系数;FLAC3D软件

Point safety method for stability analysis of reinforced earth retaining wall
YANG Guo-lin, LIU Ze

School of Civil Engineering, South Central University, Changsha 410075, China

Abstract:The method of point safety factor was used to analysis the stability of reinforced earth retaining wall. Based on the theoretical analysis, the point safety factors for rock mass, soil, reinforcement and interface between soil and reinforcement, the safety factors of tensile and pullout were proposed, the steps for calculation in FLAC3D software and the corresponding FISH orders were given, and a project in Shaozhu Express Way was analyzed, the differences between the methods of point safety factor and shear strength reduction (SSR) were contrasted. The results show that the point safety factor can not only access the security state of all parts of the wall, but also can be used to analyze the tensile stability and anti-pullout stability of reinforcements, it is advantage to analyze the weak link of reinforced earth retaining wall and meet the requirement that the reinforced earth retaining wall should check its internal and external stability of design standards. While the shear strength reduction is more suitable for analyzing the overall stability of retaining wall. Point safety factor has higher computational efficiency than that of the shear strengthen reduction.

 

Key words: reinforced earth retaining wall; stability; point safety factor; FLAC3D software

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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