(1. Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;3. College of Civil Engineering and Architecture,Guilin University of Technology,Guilin,Guangxi 541004,China;4. Guizhou Transportation Planning Survey and Design Academe Co.,Ltd.,Guiyang,Guizhou 550001,China)
Abstract:Based on the shear mechanical properties of structural plane under condition of constant normal stiffness,the load transfer mechanism of rock-socketed pile was studied. Considering the bond strength of pile-rock interface,a complete shear mechanism of pile-rock interface of rock-socketed pile was proposed,including bond damage,sliding dilatancy and shear slipping. According to the mechanical properties of pile-rock interface in different shear stages,complete shear constitutive equations for pile-rock interface were put forward. On the basis of shear mechanical properties of pile-rock interface,the enhanced effect of skin friction was analyzed theoretically. The results show that the enhanced effect occurs at the whole pile side and is the most distinct in the vicinity of pile tip. Considering the enhanced effect of skin friction,the theoretical formula for vertical bearing capacity of rock-socketed pile was proposed,which is obviously different from the traditional method suggested by specifications. Comparative analysis of case study shows that the vertical bearing capacity calculated by the proposed method is much closer to the field static load test result than the value calculated by the specifications. It provides a new procedure for design and application of rock-socketed piles.
黄生根,张晓炜,曹 辉. 后压浆钻孔灌注桩的荷载传递机制研究[J]. 岩土力学,2004,25(2):251-254.(HUANG Shenggen,ZHANG Xiaowei,CAO Hui. Mechanism study of bored cast-in-place piles with post-grouting technology[J]. Rock and Soil Mechanics,2004,25(2):251-254.(in Chinese))
Your browse does not support frame! " target="_blank">
[5]
杜海金,叶洪东,李 燕,等. 粉喷桩侧摩阻力强化效应分析[J]. 岩石力学与工程学报,2004,23(22):3 775-3 779.(DU Haijin,YE Hongdong,LI Yan,et al. Analysis of strengthening effect of skin friction of deep jetting mixing pile[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(22):3 775-3 779.(in Chinese))
Your browse does not support frame! " target="_blank">
[8]
董金荣. 灌注桩侧阻力强化弱化效应研究[J]. 岩土工程学报,2009,31(5):658-662.(DONG Jinrong. Enhanced and weakened effect of skin friction of cast-in-situ piles[J]. Chinese Journal of Geotechnical Engineering,2009,31(5):658-662.(in Chinese))
刘建刚,王建平. 嵌岩桩的嵌固效应及载荷试验P-s曲线特征分析[J]. 工业建筑,1995,25(5):41-44.(LIU Jiangang,WANG Jianping. Analysis for embedding effect of rock-socketed pile and P-s curve features of loading test[J]. Industrial Construction,1995,25(5):41-44.(in Chinese))
Your browse does not support frame! " target="_blank">
[16]
中华人民共和国行业标准编写组. JGJ 94—2008建筑桩基技术规范[S]. 北京:中国建筑工业出版社,2008.(The Professional Standards Compilation Group of People?s Republic of China. JGJ 94—2008 Technical code for building pile foundation[S]. Beijing:China Architecture and Building Press,2008.(in Chinese))
Your browse does not support frame! " target="_blank">
[1]
吴兴序. 桩的端阻和侧摩阻的相互作用及其工程应用价值[J]. 西南交通大学学报,1997,32(3):313-318.(WU Xingxu. Interaction between friction and tip resistance of piles and their significance in construction[J]. Journal of Southwest Jiaotong University,1997,32(3):313-318.(in Chinese))
[13]
赵明华,雷 勇,刘晓明. 基于桩-岩结构面特性的嵌岩桩荷载传递分析[J]. 岩石力学与工程学报,2009,28(1):103-110. (ZHAO Minghua,LEI Yong,LIU Xiaoming. Analysis of load transfer of rock-socketed piles based on characteristics of pile-rock structural plane[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(1):103-110.(in Chinese))
彭柏兴,王星华,雷金山. 湘浏盆地红层嵌岩桩荷载传递性状试验研究[J]. 工程地质学报,2009,17(3):401-407.(PENG Baixing,WANG Xinghua,LEI Jinshan. Static loading study of bearing capability behavior of rock-socket pile in red beds soft rock in Xiang—Liou Basin[J]. Journal of Engineering Geology,2009,17(3):401-407.(in Chinese))
[7]
蒋建平,高广运,章杨松. 桩端岩土强度提高对超长桩桩身总侧阻力的强化效应研究[J]. 岩土力学,2009,30(9):2 609-2 615. (JIANG Jianping,GAO Guangyun,ZHANG Yangsong. Strengthening effect of total pile lateral friction by improving rock or soil strength at pile tip[J]. Rock and Soil Mechanics,2009,30(9):2 609-2 615.(in Chinese))
Your browse does not support frame! " target="_blank">
[10]
GHAZVINIAN A H,TAGHICHIAN A,HASHEMI M,et al. The shear behavior of bedding planes of weakness between two different rock types with high strength difference[J]. Rock Mechanics and Rock Engineering,2010,43(1):69-87.
[19]
中华人民共和国行业标准编写组. JGJ 72—2004高层建筑岩土工程勘察规程[S]. 北京:中国建筑工业出版社,2004.(The Professional Standards Compilation Group of People?s Republic of China. JGJ 72—2004 Specification for geotechnical investigation of tall buildings[S]. Beijing:China Architecture and Building Press,2004.(in Chinese))
Your browse does not support frame! " target="_blank">
[3]
辛公锋,张忠苗,夏唐代,等. 高荷载水平下超长桩承载性状试验研究[J]. 岩石力学与工程学报,2005,24(13):2 397-2 402.(XIN Gongfeng,ZHANG Zhongmiao,XIA Tangdai,et al. Experimental study on the bearing behaviors of overlength piles under heavy load[J]. Chinese Journal of Rock Mechanics and Engineering,2005,24(13):2 397-2 402.(in Chinese))
Your browse does not support frame! " target="_blank">
[6]
张建新,吴东云. 桩端阻力与桩侧阻力相互作用研究[J]. 岩土力学,2008,29(2):541-544.(ZHANG Jianxin,WU Dongyun. Research on interaction between resistance at pile and lateral resistance of pile[J]. Rock and Soil Mechanics,2008,29(2):541-544.(in Chinese))
Your browse does not support frame! " target="_blank">
[2]
刘利民,陈竹昌,李发明. 桩侧阻力的强化效应[J]. 特种结构,1998,15(4):27-29.(LIU Limin,CHEN Zhuchang,LI Faming. The pile siding resistance strengthening effect[J]. Special Structures,1998,15(4):27-29.(in Chinese))
Your browse does not support frame! " target="_blank">
[15]
史佩栋,梁晋渝. 嵌岩桩竖向承载力的研究[J]. 岩土工程学报,1994,16(4):32-39.(SHI Peidong,LIANG Jinyu. Vertical bearing capacity of rock-socketed piles[J]. Chinese Journal of Geotechnical Engineering,1994,16(4):32-39.(in Chinese))
[18]
中华人民共和国行业标准编写组. TB 10002.5—2005铁路桥涵地基和基础设计规范[S]. 北京:中国铁道出版社,2005.(The Professional Standards Compilation Group of People?s Republic of China. TB 10002.5—2005 Code for design on subsoil and foundation of railway bridge and culvert[S]. Beijing:China Railway Publishing House,2005.(in Chinese))
Your browse does not support frame! " target="_blank">