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模型嵌岩桩试验及数值分析 预览 被引量:28

TEST AND NUMERICAL ANALYSIS OF MODEL ROCK-SOCKETED PILE
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摘要 由于嵌岩桩的极限承载力很高,在现场试验中很难将其加载至破坏和监测破坏时嵌岩段摩阻力的分布特征.采用室内模型试验方法对桩1混凝土及桩1岩石界面的摩阻特性进行研究.试验中对两个嵌岩桩模型进行荷载试验,将其中一个加载至破坏.试验结果表明,破坏发生在桩/混凝土界面,而桩身及岩体内部均保持完好.另外,桩/岩石界面上的摩阻力分布是非均匀的;模型桩破坏时在嵌岩段上部产生的摩阻力远大于下部的值.数值模拟结果表明,摩阻力的这种分布特性是因为桩周岩体变形所在界面所产生的法向压应力的影响.试验结果说明,对于建造在高强度岩体中的嵌岩桩,其承载力特性极大地取决于桩/岩石界面的摩阻特性,而摩阻力的分布又受到桩周岩体变形的影响. Rock-socketed piles can hardly be loaded to failure in field tests due to their high ultimate bearing capacity. In order to investigate the pile resistance behavior along the concrete-rock interface, two rock-socketed pile models were tested in laboratory. One model was loaded to failure at the maximum applied load. It was observed that the slippage occurred along the concrete-rock interface, while the pile body and the rock mass remained intact. The mobilized pile resistance along the concrete-rock interface within the rock-socketed section was evaluated from the recorded axial strains. The results indicated that the shaft resistance was not evenly mobilized within the socket. It is clear that the mobilized pile resistance in the upper zone is much greater than that in the lower zone. In addition, a serious of numerical simulations of tests were performed by using a finite element program. The interfacial elements were adopted in the program to model the concrete-rock interface behavior. The numerical analyses indicated that notable normal stress could be produced along the concrete-rock interface due to the lateral deformation in the rock mass. The mobilization of the pile resistance along the interface was greatly influenced by the normal stress. Therefore, the mobilized pile resistance in the upper zone is much greater than that in the lower zone. The investigation suggests that the pile resistance behavior along the concrete-rock interface can dominate the working performance of the rock-socketed piles constructed in hard rocks. Furthermore, the pile resistance along the concrete-rock interface can be greatly influenced by the deformation characteristics of rock mass.
作者 王耀辉 谭国焕 李启光 WANG Yaohui, THAM L G, LEE P K K(1. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. Department of Civil Engineering, University of Hong Kong, Hong Kong, China)
出处 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2007年第8期 1691-1697,共7页 Chinese Journal of Rock Mechanics and Engineering
关键词 桩基工程 嵌岩桩 荷载试验 数值模拟 pile foundations rock-socketed pile load test numerical simulation
作者简介 王耀辉(1971-),男,2005年于香港大学岩土工程专业获博士学位,主要从事桩基及地基基础方面的研究工作.E-mail:wangyaohui@21cn.com
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参考文献16

  • 1Geotechnical Engineering Office,Civil Engineering and Development Department,the Government of the Hong Kong Special Administrative Region of the People's Republic of China.Foundation design and construction[R].Hong Kong:Civil Engineering and Development Department,the Government of the Hong Kong Special Administrative Region of the People's Republic of China,2006. 被引量:1
  • 2张建新,叶洪东,杜海金,谭燕秋.嵌岩桩设计中几个问题的探讨[J].岩石力学与工程学报,2003,22(7):1222-1225. 被引量:30
  • 3张建新,吴东云,杜海金.嵌岩桩承载性状和破坏模式的试验研究[J].岩石力学与工程学报,2004,23(2):320-323. 被引量:39
  • 4董平,秦然,陈乾,张伯友.大直径人工挖孔嵌岩桩的承载性状[J].岩石力学与工程学报,2003,22(12):2099-2103. 被引量:26
  • 5WANG Y H,THAM L G,LEE P K K,et al.A study on rock-socketed piles[C].Proceedings of the Seminar of Design of Rock-socketed Piles.Hong Kong:Center of Research and Professional Development,2005:1-18. 被引量:1
  • 6LAM T S K,JOHNSTON I W.Shear behavior of regular triangular concrete/rock joint-evaluation[J].Journal of Geotechnical Engineering,1989,115(5):728-740. 被引量:1
  • 7FINNO R J.Evaluation of capacity of micropiles embedded in Dolomite[R].Evanston,USA:Department of Civil and Environmental Engineering,Northwestern University,2002. 被引量:1
  • 8INDRARATNA B,HAQUE A,AZIZ N.Laboratory modeling of shear behavior of soft joints under constant normal stiffness conditions[J].Geotechnical and Geological Engineering,1998,16(1):17-44. 被引量:1
  • 9SEIDEL J P,HABERFIELD C M.Laboratory Testing of concreterock joints in constant normal stiffness direct shear[J].Geotechnical testing Journal,2002,25(4):391-404. 被引量:1
  • 10SEIDEL J P,HABERFIELD C M.A theoretical model for rock joints subjected to constant normal stiffness direct shear[J].International Journal of Rock Mechanics and Mining Sciences,2002,39(5):539 -553. 被引量:1

二级参考文献42

  • 1刘利民,张洪文.嵌岩桩承载性状的灰色关联分析[J].西部探矿工程,1996,8(3):6-7. 被引量:14
  • 2王国民.软岩钻孔灌注桩的荷载传递性状[J].岩土工程学报,1996,18(2):99-103. 被引量:25
  • 3池跃君.超长桩竖向承载及变形机理的研究[M].天津大学,1999.. 被引量:1
  • 4池跃君 顾晓鲁 等.天津软土地区大直径超长灌注桩垂直承载性状的试验研究.高层建筑桩基工程技术[M].北京:中国建筑工业出版社,1998.. 被引量:1
  • 5叶玲玲.嵌岩灌注桩轴向承力传递函数数值计算理论及其实际应用(博士学位论文)[M].上海:同济大学,1994.. 被引量:1
  • 6韦立德.嵌岩桩承载计算机模拟研究(硕士学位论文)[M].南宁:广西大学,2000.. 被引量:1
  • 7史佩栋.超高层建筑物下嵌岩桩的荷载传递特性的长期观测[A].见:黄熙龄主编.中国建筑学会地基基础学会论文集[C].山西:高校联合出版社,1992.. 被引量:1
  • 8中华人民共和国国家行业标准编写组.铁路桥涵设计规范(TBJ2-85)[M].北京:中国铁道出版社,1985.. 被引量:1
  • 9中华人民共和国国家行业标准编写组.建筑地基基础设计规范(GBJ7-89)[M].北京:中国建筑工业出版社,1989.. 被引量:1
  • 10中华人民共和国国家行业标准编写组.建筑桩基设计规范(JGJ94-94)[M].北京:中国建筑工业出版社,1994.. 被引量:1

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