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中南大学学报(自然科学版)

Journal of Central South University

第42卷    第5期    总第201期    2011年5月

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文章编号:1672-7207(2011)05-1447-07
土钉墙支护极限高度的有限元分析与拟合
俞建霖1,何萌1,张文龙1, 2,龚晓南1,应建新3

(1. 浙江大学 软弱土与环境土工教育部重点实验室,浙江 杭州,310058;
2. 上海现代建筑设计集团 申元岩土工程有限公司,上海,200011;
3. 浙江世贸房地产开发有限公司,浙江 杭州,310007
)

摘 要: 利用地基极限承载力的有限元分析法求解思路分析基坑工程中土钉墙支护的极限高度,研究土钉墙支护的主要影响因素与极限高度之间的变化规律,具体包括地基土体黏聚力、内摩擦角、土钉长度、边坡坡角、地基土体弹性模量和复合土体弹性模量等因素。通过拟合分析方法,重点考虑地基土体黏聚力、内摩擦角、土钉长度、边坡坡角4个主要因素,提出计算土钉墙支护极限高度的经验公式,该公式在垂直开挖无支护情况下即为无支护下竖直陡坡的临界高度理论解。通过2个工程实例分析,证明了采用经验公式的计算结果与工程实际情况比较吻合,对基坑工程的设计和分析具有借鉴和参考价值。

 

关键字: 土钉墙支护;极限高度;增量有限元法;影响因素;拟合公式

Finite element analysis and fitting of critical height of
soil nailed wall
YU Jian-lin1, HE Meng1, ZHANG Wen-long1, 2, GONG Xiao-nan1, YING Jian-xin3

1. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education,
 Zhejiang University, Hangzhou 310058, China;
2. Xiandai Architectural Design Group, Shen Yuan Geotechnical Engineering Co.,Ltd, Shanghai 200011, China;
3. Zhejiang Shimao Real Estate Development Co. Ltd., Hangzhou 310007, China

Abstract:Using the thought of finite element of ultimate bearing capacity of foundation, the critical height of soil nailed wall foundation pit was analyzed. The laws between the critical height and the chief influence factors including the cohesion of soil, the internal friction angle of soil, the soil nail length, the slope angle, the elastic modulus of soil, the elastic modulus of composite soil were studied, then through the fitting analysis, the empirical formulas of the critical height of soil nailing foundation pit was simulated, considering four chief influence factors which were the cohesion of soil, the internal friction angle, the soil nail length and the slope angle. This formula was the theoretical solution of critical height of unsupported upright slope when the foundation pit was upright excavated under the condition of unsupported. The case analysis verifies the results and shows that the empirical formulas can fit the engineering projects very well, which can provide reference value for the design and the analysis of foundation pit.

 

Key words: soil nailed wall; critical height; step loading finite element method; influential factor; fitting formula

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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