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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第3期    总第259期    2016年3月

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文章编号:1672-7207(2016)03-0905-08
剪切模量随深度呈指数函数增大地基中锚杆弹塑性分析
陈昌富,汤宇,梁冠亭

(湖南大学岩土工程研究所,湖南长沙,410082)

摘 要: 考虑地基土体力学性质随深度变化特性,假定土体剪切模量、弹性极限抗剪强度以及抗剪强度残余系数均随深度按指数函数增大,锚固界面采用一次跌落软化模型,基于剪切位移法推导锚固段周边土体处于弹、塑性阶段时锚杆位移、轴力、剪应力解析式,并以工程实例检验该方法及基本假设的合理性。最后,基于该方法分析锚固段周边土体剪切模量、弹性极限抗剪强度、抗剪强度残余系数随深度分布参数以及锚固段弹性模量对锚杆受力变形特性的影响。研究结果表明:土体力学性质随深度增加呈指数函数增大有利于改善锚杆工作性状,在计算中给予合理考虑,可更加真实地反映锚杆荷载传递过程。

 

关键词: 锚杆;荷载传递;剪切模量

Elastic-plastic analysis for bolts in ground with shear modulus increasing following an exponential function with depth
CHEN Changfu, TANG Yu, LIANG Guanting

Geotechnical Engineering Institute, Hunan University, Changsha 410082, China

Abstract:Considering the characteristics of mechanical properties of the ground soil varying with depth, it is assumed that soil’s shear modulus, shear strength in the elastic limit state and residual coefficient of shear strength increase following exponential functions with depth. Based on the shear displacement method, analytic formulas of the displacement, axial force and shear stress of bolts were derived by using the dropping softening mode for anchorage interface when the surrounding soil is in elastic or plastic stress state. The good agreement of the engineeringproject with the present method confirmed the rationality of the proposed approach and basic assumptions. Finally, influences of distribution parameters with depth of soil’s shear modulus, shear strength in the elastic limit state, residual coefficient of shear strength and elastic modulus of anchorage segment on mechanical and deformation characteristics of bolts were also analyzed. The results indicate that mechanical properties of soil increasing following exponential functions with the increase of depth have benefits on working traits of bolts, meanwhile, reasonable consideration in the calculation can more truly reflect the load transfer process of bolts.

 

Key words: bolt; load transfer; shear modulus

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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