Field test on mechanical properties and deformation characteristics of double-row piles with different embedded depths
ZUO Dian-jun1, 2, DENG Cheng-fa3
1. Geotechnical Engineering Research Center, Tianjin Research Institute for water transport engineering, M.O.T., Tianjin 300456, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3. Geotechnical Research Institute, Zhejiang institute of Hydraulics＆Estuary, Hangzhou 310020, China.
Abstract：Based on excavation of foundation pit for a sluice in Zhejiang Province, field tests on deformation characteristics of retaining structure with non-equal-length double-row piles are performed by burying inclinometers and reinforcement stress meters in row piles. The influences of the mounted depth of back row piles are discussed by using the elastic foundation beam method. The results indicated that: the change laws of top displacement, pile shear and bending moment of double piles are consistent with those of equal-length double-row piles. With the increase of the embedded depth of back row piles, the top horizontal displacement of front and back row piles decreases. The shear force and bending moment of front row piles decrease, while those of back row piles increase. When the embedded depth is more than 3/4 of the pile length, the decrease or increase trend of top horizontal displacement, shear force and bending moment of piles are not obvious. These achievements may provide certain reference for the design optimization of supporting structures for foundation pits with double-row piles.
左殿军, 邓成发. 不同嵌固深度排桩受力与变形特性现场试验研究[J]. 岩土工程学报, 2014, 36(zk2): 354-359.
ZUO Dian-jun, DENG Cheng-fa. Field test on mechanical properties and deformation characteristics of double-row piles with different embedded depths. Chinese J. Geot. Eng., 2014, 36(zk2): 354-359.
[1] 龚晓南. 深基坑工程设计施工手册[M]. 北京: 中国建筑工业出版社, 1998. (GONG Xiao-nan. Manual of deep foundation pit engineering designation and construction[M]. Beijing: China Architecture and Building Press, 1998. (in Chinese)) [2] 何颐华, 杨 斌, 金宝森, 等. 双排护坡桩试验与计算的研[J]. 建筑结构学报, 1996, 17(2): 58-56. (HE Yi-hua, YANG Bin, JIN Bao-sen, et al. A study on the test and calculation of double-row fender piles[J]. Journal of Building Structures, 1996, 17(2): 58-56. (in Chinese)) [3] 胡敏云, 夏永承, 高渠清.桩排式支护护臂桩侧土压力计算原理[J]. 岩石力学与工程学报, 2000, 19(3): 376-379. (HU Min-yun, XIA Yong-cheng, GAO Qu-qing. Calculation principle of earth pressure against retaining piles of piles-row retaining structure[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19(3): 376-379. (in Chinese)) [4] 钟小春. 基坑支护桩间土体拱效应理论及有限元分析[J]. 岩土工程学报, 2006, 28(增刊2): 1501-1504. (ZHONG Xiao-chun. Soil arching between protecting piles of foundation pits and FEM analysis[J]. Chinese Jounal of Geotechnical Engineering, 2006, 28(S2): 1501-1504. (in Chinese)) [5] 赖冠宙, 房营光, 史宏彦深基坑排桩支护结构空间共同变形分析[J]. 岩土力学, 2007, 28(8): 1749-1752. (LAI Guan-zhou, FANG Ying-Guan, SHI Hong-yan. Spatial mutual deformation analysis method for row of piles of deep excavation[J]. Rock and Soil Mechanics, 2007, 28(8): 1749-1752. (in Chinese)) [6] 平 扬, 白世伟, 曹俊坚. 深基双排桩空间协同计算理论及位移反分析[J]. 土木工程学报, 2001, 34(2): 79-83. (PING Yang, BAI Shi-wei, CAO Jun-jian. Calculation theory considering spatial influence and displacement feedback design of double-row piles in deep foundation[J]. China Civil Engineering Journal, 2001, 34(2): 79-83. (in Chinese)) [7] 何建明, 白世伟. 深基坑排桩-圈梁支护结构协同作用研究[J]. 岩土力学, 1997, 18(3): 41-46. (HE Jian-ming, BAI Shi-wei. Study of cooperative action between row of piles and ring beam of deep foundation pit supporting structure[J]. Rock and Soil Mechanics, 1997, 18(3): 41-46. (in Chinese)) [8] 吴 刚, 白 冰, 聂庆科. 深基坑双排桩支护结构设计计算方法研究[J]. 岩土力学, 2008, 29(10): 2753-2758. (WU Gang, BAI Bing, NIE Qing-ke. Research on calculation method of double-row piles retaining structure for deep excavation [J]. Rock and Soil Mechanics, 2008, 29(10): 2753-2758. (in Chinese)) [9] 郑 刚, 李 欣, 刘 畅, 等. 考虑桩土相互作用的双排桩分析[J]. 建筑结构学报, 2004, 25(1): 99-106. (ZHENG Gang, LI Xin, LIU Chang, et a1. Analysis of double row piles in consideration of the pile-soil interaction[J]. Journal of Building Structures, 2004, 25(1): 99-106. (in Chinese)) [12] JGJ120—2012 建筑桩基技术规范[S]. 北京: 中国建筑工业出版社, 2012. (JGJ120—2012 Technical specification for retaining and protection of building foundation excavations [S]. Beijing: China Architecture and Building Press, 2012. (in Chinese)) [13] 张泽坤. h型抗滑桩的有限元分析[D]. 成都: 西南交通大学, 2008. (ZHANG Ze-kun. Finite element analysis of h anti-slide pile[D]. Chengdu: Southwest Jiao tong University,2008. (in Chinese)) [14] 于 洋, 孙红月, 尚岳全. 锚固深度对双排抗滑桩力学性能影响[J]. 岩石力学与工程学报, 2013, 32(10): 1999-2006. (YU Yang, SUN Hong-yue, SHANG Yue-quan. Influence of anchorage depth of on mechanical behavior of double-row anti-slide piles[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(10): 1999-2006. (in Chinese)) [15] 杜秀忠, 杨光华, 孙昌利, 等. 双排桩支护在某水利基坑中的应用[J]. 岩土工程学报, 2012, 11(增刊1): 490-494. (DU Xiu-zhong, YANG Guang-hua, SUN Chang-li, et al. Application of retaining structurewithdouble-row pilesin a hydraulic excavation[J]. Chinese Jounal of Geotechnical Engineering, 2012, 11(S1): 490-494. (in Chinese)) [16] 郑陈旻, 王曾辉, 章 昕, 等. 双排桩支护在福建沿海软土深基坑工程中的经济性分析[J]. 岩土工程学报, 2010, 32(增刊1): 317-320. (ZHENG Chen-min, WANG Zeng-hui, ZHANG Xin, et al. Economic analysis of double-row piles in deep foundation pits in soft soils in coastal areas of Fujian Province[J]. Chinese Jounal of Geotechnical Engineering, 2010, 32(S1): 317-320. (in Chinese)) [17] 林 鹏, 王艳峰, 范志雄, 等.双排桩支护结构在软土基坑工程中的应用分析[J]. 岩土工程学报, 2010, 32(增刊2): 331-334. (LIN Peng, WANG Yan-feng, FAN Zhi-xiong, et al. Application and analysis of retaining structure with double-row piles in soft ground[J]. Chinese Jounal of Geotechnical Engineering, 2010, 32(S2): 331-3334. (in Chinese))
