长江科学院院报 ›› 2012, Vol. 29 ›› Issue (3): 55-58.

• 岩土工程 • 上一篇    下一篇

越南海防热电厂二期工程超长大直径灌注桩荷载传递机理试验研究

张利洁 1,2 ,边智华 2 ,景  锋 2 ,唐辉明 1 ,杨喜庆 3 ,叶红卫 3 ,毕  承 3   

  1. 1.中国地质大学 工程学院,武汉  430074; 2.长江科学院 水利部岩土力学与工程重点实验室,武汉  430010;3. 湖北省电力建设第一工程公司,武汉  430061
  • 收稿日期:2011-02-14 出版日期:2012-03-01 发布日期:2012-05-15
  • 作者简介:张利洁(1976-),女,湖北浠水人,高级工程师,博士研究生,主要从事岩体力学试验及岩土工程数值模拟研究工作
  • 基金资助:

    国家重点基础研究发展计划资助(973)项目(2011CB710603,2011CB710606);水利部公益性行业科研专项(201001008)

Mechanism of Load Transfer on Ultra-long  and Large-Diameter Bored-Piles at Thermal Power Plant Phase-Ⅱin Hai Phong City of Vietnam

ZHANG Li-jie 1,2, BIAN Zhi-hua 2 ,JING Feng 2 ,TANG Hui-ming 1 ,YANG Xi-qing 3 ,YE Hong-wei 3 ,BI Cheng 3   

  1. 1.Faculty of Engineering, China University of Geosciences, Wuhan  430074, China;  2.Key Laboratory of Geotechnical Mechanics and Engineering of MWR, Yangtze River Scientific Research Institute, Wuhan430010,China; 3.Hubei First Electric Power Engineering Construction Company, Wuhan  430061, China
  • Received:2011-02-14 Online:2012-03-01 Published:2012-05-15

摘要: 越南海防热电厂二期工程位于海防市(Hai Phong)水源镇(Thuynguyen),装机容量为2×300 MW。场地为Gia河边的低地,属于喀斯特地貌区,岩溶比较发育,上部存在较厚的淤泥质土层,土质较差,不能满足厂区上部结构对地基的要求,因此厂区主要建筑物的地基处理采用钻孔灌注桩。对该工程区桩基进行了检测试验,依据桩基试验实测数据,分析了桩身轴力的荷载传递机理以及桩的荷载-沉降特性。结果表明:该工程区的单桩极限承载力可取为7 000 kN;桩身轴力的传递特性受多种因素影响,桩顶荷载主要通过桩侧摩阻力逐渐向下传递,具有明显的摩擦桩特点,桩侧摩阻力所占比重较大,而桩端阻力所占比重较小;桩底沉渣厚度显著影响桩顶沉降量与极限承载力。

Abstract: The  thermal power plant is located at Thuy-nguyen District, Haiphong city in Vietnam with an installed capacity of 2×300 MW.  Since the power plant is located in a low land near the Gia River with developed Karst geomorphology and thick mucky soil strata on the top, the soil quality is too weak to meet the requirements of the foundation. Bored piles are planned to be used on the main construction area. Pile foundation test is performed in this project area. Mechanism of axial force transfer on the pile and the characteristics of load-settlement of the pile are analyzed. The results suggest that the ultimate bearing capacity of single pile could be 7000kN in this area. The axial force transfer on pile is influenced by many factors. Load on the pile top is transferred down gradually by lateral friction resistance which takes up a great proportion compared with the friction resistance on the pile end. Sediment thickness at the bottom of pile remarkably affects the pile top settlement and the ultimate bearing capacity of pile.

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