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中南大学学报(自然科学版)

Journal of Central South University

第33卷    第5期    总第147期    2002年10月

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文章编号:1005-9792(2002)05-0457-05
碎石桩复合地基应力应变分析
刘 杰1,2,张可能1

(1·中南大学资源环境与建筑工程学院,湖南长沙 410083;
2·株洲工学院土木工程系,湖南株洲 412008
)

摘 要: 在考虑桩-土相互作用的基础上,根据桩-土侧向变形协调及竖向变形相等的条件,应用弹性理论导出了线弹性状态下桩体及桩周土的应力-应变关系,得出了桩体材料屈服时桩-土应力比的计算式;利用摩尔-库仑屈服准则导出了桩周土处于极限平衡状态时,桩体和桩周土竖向变形的表达式以及碎石桩极限承载力计算式;讨论了桩-土应力比与置换率及桩周土变形模量的关系.研究结果表明:用碎石桩加固软土地基,加固效果较好;但用碎石桩来加固土的变形模量大于8 MPa的地基,加固效果不明显.对于碎石桩加固的软土地基,应按控制沉降量设计法代替传统的控制承载力设计法进行设计计算.

 

关键字: 应力比;置换率;承载力;平衡状态

Analysis of stress and strain on the composite foundation of the gravel piles
LIU Jie1,2,ZHANGKe-leng1

1.College of Resources, Environment and Engineering, Central South University, Changsha 410083, China;
2.Department of Civil Engineering, Zhuzhou Institute of Technology, Zhuzhou 412008, China

Abstract:Based on the pile-soil interaction, equality of the vertical deformation and the harmony of the lateral deformation, relationship of the stress and the strain of the piles and the pile lateral soil are derived in the elastic theory under the linear elasticity. The formula of pile-soil stress ratio at the pile materials yielding is obtained. The formulas of the vertical deformation in the piles and the pile lateral soil, the ultimate bearing capacity of the single pile are derived in Mohr-Coulomb yielding condition at the ultimate equilibrium state. Relationships between the pile-soil stress ratio, the replacement ratio, and the pile lateral soil modulus of deformation are discussed. It is indicated that effectiveness reinforced by the gravel piles in the weak ground is obvious, but it isn′tobvious for the ground modulus of deformation to excess 8.0MPa, and reinforced effectiveness is finite.It is also shown that the traditional design method of controllingb earing capacity should be replaced by the design method of controlling settlement to the weak ground reinforced by the gravel pile.

 

Key words: stress ratio; replacement ratio; bearing capacity; equilibrium state

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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