周密,韩雨薇,周小文,肖自卫

• 1:华南理工大学亚热带建筑科学国家重点实验室
• 2:华南理工大学华南岩土研究院
• 3:中铁南方投资集团有限公司

摘要(Abstract)：

【目的】研究海上沉桩贯入软土地基诱发的挤土效应。【方法】利用有限元大变形RITSS程序,通过大量的参数分析,对海洋地基桩基础贯入引起的挤土效应、土体破坏机理、周围土体的水平和隆起位移,以及挤土效应的影响范围展开系统研究。【结果】将数值模型与锥形桩(圆锥贯入仪)经典理论解进行比对,获得了较好的一致性。对大量数值仿真结果进行统计,获得在海洋地基中沉桩时土体的径向位移和垂直隆起高度的定量化描述,桩周土在1～3倍圆桩半径范围内最大水平位移为0.26R。【结论】提出关于水平位移和隆起高度的计算公式,能够预测沉桩对临近土体扰动的影响范围,能较为准确地评估多桩系统中沉桩对临近桩基础的影响。

关键词(KeyWords)： 沉桩;挤土效应;RITSS;数值模拟

Abstract:

Keywords:

基金项目(Foundation): 广东省水利科技创新项目(No.2015-17)

作者(Author): 周密,韩雨薇,周小文,肖自卫

参考文献(References)：

• [1]袁剑平,毛鸿飞,潘新祥,等.海上浮式风机研究现状展望——基于南海海域[J].广东海洋大学学报, 2020,40(5):133-138.
• [2]龚晓南,李向红.静力压桩挤土效应中的若干力学问题[J].工程力学, 2000, 17(4):7-13.
• [3]李家华,单恒年,陈祥.沉桩挤土效应对桩周土体径向位移数值分析[J].水道港口, 2018, 39(4):490-495.
• [4]王幼青.挤土桩水平向挤土位移分析[J].哈尔滨工业大学学报, 2003, 35(4):472-475.
• [5]刘裕华,陈征宙,彭志军,等.应用圆孔柱扩张理论对预制管桩的挤土效应分析[J].岩土力学, 2007, 28(10):2167-2172.
• [6]周火垚,施建勇.饱和软黏土中足尺静压桩挤土效应试验研究[J].岩土力学, 2009, 30(11):3291-3296.
• [7]江强,陈育民,王翔鹰,等.排水刚性桩沉桩挤土效应的现场试验研究[J].土木工程学报, 2018, 51(4):87-93.
• [8]周万清,蔡健,林奕禧,等.深厚软土地基细长PHC管桩水平荷载试验研究[J].华南理工大学学报(自然科学版), 2007, 35(7):131-136.
• [9]张爱军,莫海鸿,朱珍德.受土体侧移作用的单桩的弹塑性地基反力解析法[J].华南理工大学学报(自然科学版), 2012, 40(9):153-159.
• [10] GHOSH S, KIKUCHI N. An arbitrary Lagrangian-Eulerian finite element method for large deformation analysis of elastic-viscoplastic solids[J]. Computer Methods in Applied Mechanics and Engineering, 1991, 86(2):127-188.
• [11] GHOSH S. Arbitrary Lagrangian-Eulerian finite element analysis of large deformation in contacting bodies[J].International Journal for Numerical Methods in Engineering, 1992, 33(9):1891-1925.
• [12] HU Y, RANDOLPH M F. A practical numerical approach for large deformation problems in soil[J].International Journal for Numerical and Analytical Methods in Geomechanics, 1998, 22(5):327-350.
• [13] TIAN Y H, CASSIDY M J, RANDOLPH M F, et al. A simple implementation of RITSS and its application in large deformation analysis[J]. Computers and Geotechnics, 2014, 56:160-167.
• [14] MA H L, ZHOU M, HU Y X, et al. Interpretation of layer boundaries and shear strengths for soft-stiff-soft clays using CPT data:LDFE analyses[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2016,142(1):04015055.
• [15] ZHOU M, HOSSAIN M S, HU Y X, et al. Installation of stiffened caissons in nonhomogeneous clays[J]. Journal of Geotechnical and Geoenvironmental Engineering,2016, 142(2):04015079.
• [16] HERRMANN L R. Finite Element Analysis of Contact Problems[J]. Journal of the Engineering Mechanics Division, 1978, 104(5):1043-1057.
• [17] BALIGH M M. Strain path method[J]. Journal of Geotechnical Engineering, 1985, 111(9):1108-1136.
• [18] LIYANAPATHIRANA D S. Arbitrary Lagrangian Eulerian based finite element analysis of cone penetration in soft clay[J]. Computers and Geotechnics,2009, 36(5):851-860.
• [19] LU Q, RANDOLPH M F, HU Y, et al. A numerical study of cone penetration in clay[J]. Geotechnique, 2004,54(4):257-267.
• [20] TEH C I, HOULSBY G T. An analytical study of the cone penetration test in clay[J]. Géotechnique, 1991,41(1):17-34.
• [21] VAN DEN BERG P. Analysis of soil penetration[D].Delft:Technische Universiteit Delft, 1994.
• [22] WALKER J, YU H S. Adaptive finite element analysis of cone penetration in clay[J]. Acta Geotechnica, 2006, 1(1):43-57.
• [23] YU H S. Cavity expansion methods in geomechanics[M].Dordrecht:Springer, 2000.
• [24] YU H S, HERRMANN L R, BOULANGER R W.Analysis of steady cone penetration in clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2000,126(7):594-605.
• [25] HWANG J H, LIANG N, CHEN C H. Ground response during pile driving[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2001, 127(11):939-949.
• [26] ZHAO Z F, ZHOU M, HU Y X, et al. Behavior of soil heave inside stiffened caissons being installed in clay[J].Canadian Geotechnical Journal, 2018, 55(5):698-709.
• [27] ZHOU M, LIU H L, HOSSAIN M S, et al. Numerical simulation of plug formation during casing installation of cast-in-place concrete pipe(PCC)piles[J]. Canadian Geotechnical Journal, 2016, 53(7):1093-1109.