Numerical analysis of side resistance of composite foundation with X-section cast-in-place concrete piles under rigid load
Lü Ya-ru12, DING Xuan-ming13, LIU Han-long12, Charles W. W. Ng4
1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, China; 4. Dept. of Civ. Engrg., Hong Kong Univ. of Sci. and Technol., Hong Kong 999077, China
Abstract:The bearing capacity of X-section cast-in-place concrete pile (XCC pile), a special cross-section pile, is significantly influenced by side resistance. The single-piled composite foundation including XCC pile and circular pile is simulated by means of the finite element program ABAQUS. The side resistance and side bearing capacity are compared between XCC pile and circular pile. The distribution of side resistance of XCC pile is analyzed via cross-section plan and depth. The results indicate that both the side resistance and the side bearing capacity for XCC pile are better than those of circular pile, and that the side bearing capacity of XCC pile is significantly larger than that of circular pile at the relative depth of 0.9. At the cross-section plan, because of the soil arching, the side resistance of convex arc is about 1.5 to 3 times as large as that of concave arc for XCC pile. The ratio of the side resistance for convex arc to that of concave arc increases with the relative depth. The results are available for the design of XCC pile.
吕亚茹, 丁选明, 刘汉龙, 吴宏伟. 刚性荷载下现浇X形桩复合地基桩侧摩阻力数值分析[J]. 岩土工程学报, 2012, 34(11): 2134-2140.
Lü Ya-ru, DING Xuan-ming, LIU Han-long, Charles W. W. Ng. Numerical analysis of side resistance of composite foundation with X-section cast-in-place concrete piles under rigid load. Chinese J. Geot. Eng., 2012, 34(11): 2134-2140.
[1] INDRARATNA B, BALABUBRAMANIAM A S, PHAMVAN P,,et al. Development of negative skin friction on driven piles in soft Bangkok clay[J]. Can Geotech J, 1992, 29(3): 392-404 [2] YUEN K K S, LAM T S K. Test piles and preload embankment at bridge 13 Yuen Long- Tuen Mun Eastern Corridor[R]. Hong Kong: Advisory report, Geotechnical Engineering Office, [3] LEUNG C F, CHOW Y K, SHEN R F. Behavior of pile subject to excavation-induced soil movement[J]. Journal of Geotechnical and Geoenvironmental, 2000, 126(11): 947-954 [4] SHEN R F, LEUNG C F, CHOW Y K,,et al. Negative skin friction on piles[C]// Proc Int Conf Physical Modelling in geotechnics, St. Johns Newfoundland, 2002: [5] FELLENIUS B H. Downdrag on piles in clay due to negative skin friction[J]. Can Geotech J, 1972, 9(4): 232-337 [6] KUWABARA F, POULOS H G. Downdrag Forces in Group of Piles[J]. Journal of Geotechnical Engineering. 1989, [7] LEE C J, LEE J H, JEONG S. The influence of soil slip on negative skin friction in pile groups connected to a cap[J]. Géotechnique, 2006, 56(1): 53-56 [8] 康立楷. 降水引致单桩基础行为之有限元素分析[D]. 台北:中央大学, 2000. KANG Li-kai. Finite analysis on the behaviour of single pile foundation due to low groundwater[D]. Taibei: National Central University, 2000. [9] 赵明华, 刘思思. 多层地基单桩负摩阻力的数值模拟计算[J]. 岩土工程学报, 2008, 30(3): 336-340 ZHAO Ming-hua, LIU Si-si. Numerical simulation of negative skin friction on single pile in multiple layer deposits[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(3): 336-340. (in Chinese)) [10] 刘汉龙. 现浇X形钢筋混凝土桩施工方法[P]. ZL200710020306.3, 2010. LIU Han-long. Construction technology for X-section cast-in-place concrete pile[P]. ZL200710020306.3, 2010. [11] 刘汉龙, 刘芝平, 王新泉. 现浇X型混凝土桩截面几何特性研究[J]. 中国铁道科学, 2009, 30(1): 17-23 LIU Han-long, LIU Zhi-ping, WANG Xin-quan. Study on the Geometric Characteristics of the Cast-2in-2Place X-Type Vibro-2Pile Section[J]. China Railway Science, 2009, 30(1): 17-23. (in Chinese)) [12] LÜ Y R, LIU H L, DING X M,,et al. Field tests on bearing characteristics of x-section pile composite foundation[J]. Journal of Performance of Constructed Facilities, [13] 王智强, 刘汉龙, 张敏霞, 等. 现浇X形桩竖向承载特性足尺模型试验研究[J]. 岩土工程学报, 2010, 32(6): 903-907 WANG Zhi-qiang, LIU Han-long, ZHANG Min-xia,et al. Full scale model tests on vertical bearing characteristics of cast-in-place X-section piles[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(6): 903-907. (in Chinese)) [14] 吕亚茹, 丁选明, 刘汉龙, 等. 刚性基础下现浇X形桩复合地基桩土应力比分析[J]. 岩土力学, 2012, 33(6): 1774-1780 LÜ Ya-ru, DING Xuan-ming, LIU Han-long,,et al. Analysis on pile-soil stress ratio of cast-in-place x-section concrete pile composite foundation under rigid base[J]. Rock and Soil Mechanics (Chinese), 2012, 33(6): 1774-1780 [15] 王智强. 现浇X形桩竖向承载力力学特性研究[D]. 南京: 河海大学, 2009. WANG Zhi-qing. Study on the vertical bearing characteristics of cast-in-place X-section concrete pile[D]. Nanjing: Hohai University, 2009. [16] RICHARD B, HANDY L. The arch in soil arching[J]. Journal of Geotechnical Engineer, 1985, [17] ZHAO M H, LIAO B B, LIU S S. Calculation of anti-slide piles spacing based on soil arching effect[J]. Chinese Journal of Rock and Soil Mechanics, 2010 31(4): 1211-1216