该文介绍了一种新型复合式吸力筒基础,运用商业软件Abaqus对该基础进行有限元计算,研究不同荷载条件下基础埋深和土体强度非均匀程度对承载能力的影响;模拟均质和非均质黏土中复合式吸力筒基础在单向加载、共面复合荷载下破坏机理的演变;计算共面复合荷载下的破坏包络面;提出一组闭合形式的数学表达式进行拟合;并基于现有的传统单筒型吸力筒基础的研究成果,对比分析该新型基础外侧小吸力筒对承载性能的提升作用。研究结果表明：外侧小吸力筒对于该基础的单向加载模式下的承载性能和复合承载性能均有显著的提升效果。由于破坏机理的演变,新型基础对抗扭承载力的提升优于其他极限承载力。新型复合式吸力筒基础额外的3个小吸力筒显著地扩展了V-H、V-M、H-M、V-T、T-H和T-M二维加载模式下的破坏包络面。随埋深增加,H-M破坏包络面逐渐向第一象限偏移。
Abstract
This paper introduces a new composite suction caisson foundation. In this paper, the commercial software Abaqus was used to carry out finite element calculations on the foundation, and the effects of foundation embedment depth and soil strength on the bearing capacity under different loading conditions were investigated; Failure mechanisms of composite suction caisson foundations in homogeneous and normally consolidated clays under uniaxial, coplanar composite loading were simulated; The failure envelopes under coplanar composite loading were calculated; A set of close-formed mathematical expressions was presented; And based on the existing research results of the existing skirted circular foundation, the enhancement effect of the small suction caisson on the outer side of the new foundation on the bearing performance is comparatively analyzed. The results of the study show that： the small outer suction caissons have a significant effect on both uniaxial and composite loading performance of this foundation. Due to the evolution of the failure mechanism, the new type of foundation has a better improvement in torsional bearing capacity than other ultimate bearing capacities. The three small suction caissons of composite suction caisson foundation significantly expand failure envelopes in V-H, V-M, H-M, V-T, T-H and T-M loading spaces. The H-M failure envelope gradually shifts towards the first quadrant with increasing embedment depth.
关键词
海上光伏 /
承载力 /
基础 /
黏土 /
破坏包络面 /
数值分析 /
吸力锚
Key words
bearing capacity /
foundations /
clay /
failure envelope /
numerical analysis /
suction anchor
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参考文献
[1] 武科, 栾茂田, 范庆来, 等. 复合加载模式下桶形基础破坏包络面弹塑性有限元数值分析[J]. 工程力学, 2008, 25(11): 156-161.
WU K, LUAN M T, FAN Q L, et al.Numerical analysis of failure envelopes of bucket foundation subjected to combined loads based on elasto-plastic fem[J]. Engineering mechanics, 2008, 25(11): 156-161.
[2] GOURVENEC S, BARNETT S.Undrained failure envelope for skirted foundations under general loading[J]. Géotechnique, 2011, 61(3): 263-270.
[3] HUNG L C, KIM S R.Evaluation of vertical and horizontal bearing capacities of bucket foundations in clay[J]. Ocean engineering, 2012, 52: 75-82.
[4] VULPE C.Design method for the undrained capacity of skirted circular foundations under combined loading: effect of deformable soil plug[J]. Géotechnique, 2015, 65(8): 669-683.
[5] YUN G, BRANSBY M F.The horizontal-moment capacity of embedded foundations in undrained soil[J]. Canadian geotechnical journal, 2007, 44(4): 409-424.
[6] BRANSBY M F, YUN G J.The undrained capacity of skirted strip foundations under combined loading[J]. Géotechnique, 2009, 59(2): 115-125.
[7] 范庆来, 栾茂田. V-H-T荷载空间内海上风机桶形基础破坏包络面特性分析[J]. 土木工程学报, 2010, 43(4): 113-118.
FAN Q L, LUAN M T.Failure envelopes of bucket foundation for offshore wind turbines in V-H-T loading space[J]. China civil engineering journal, 2010, 43(4): 113-118.
[8] GOVONI L, GOURVENEC S, GOTTARDI G.Centrifuge modelling of circular shallow foundations on sand[J]. International journal of physical modelling in geotechnics, 2010, 10(2): 35-46.
[9] 刘润, 王磊, 丁红岩, 等. 复合加载模式下不排水饱和软黏土中宽浅式筒型基础地基承载力包络线研究[J]. 岩土工程学报, 2014, 36(1): 146-154.
LIU R, WANG L, DING H Y, et al.Failure envelopes of large-diameter shallow buried bucket foundation in undrained saturated soft clay under combined loading conditions[J]. Chinese journal of geotechnical engineering, 2014, 36(1): 146-154.
[10] 刘润, 宋毅然, 杨灿, 等. 黏土中筒型基础竖向承载影响深度研究[J]. 太阳能学报, 2024, 45(5): 144-152.
LIU R, SONG Y R, YANG C, et al.Study on influence depth of vertical loading for bucket foundations in clay[J]. Acta energiae solaris sinica, 2024, 45(5): 144-152.
[11] BIENEN B, GAUDIN C, CASSIDY M J, et al.Numerical modelling of a hybrid skirted foundation under combined loading[J]. Computers and geotechnics, 2012, 45: 127-139.
[12] LI Y, YANG S G, ZOU X.Advanced concept design and numerical study of suction bucket foundation in deep ocean[J]. Ocean engineering, 2012, 54: 142-149.
[13] 练继建, 陈飞, 杨旭, 等. 海上风机复合筒型基础负压沉放调平[J]. 天津大学学报(自然科学与工程技术版), 2014, 47(11): 987-993.
LIAN J J, CHEN F, YANG X, et al.Suction installation and leveling of composite bucket foundation for offshore wind turbines[J]. Journal of Tianjin University (science and technology), 2014, 47(11): 987-993.
[14] 张浦阳, 黄宣旭. 海上风电吸力式筒型基础应用研究[J]. 南方能源建设, 2018, 5(4): 1-11.
ZHANG P Y, HUANG X X.Application research on suction bucket foundation for offshore wind power[J]. Southern energy construction, 2018, 5(4): 1-11.
[15] 张东明, 陈守祥, 郑淼, 等. 海上风机吸力桶基础的应用和技术分析[J]. 中国水运(下半月), 2023, 23(11): 133-135.
ZHANG D M,CHEN S X,ZHENG M,et al.Application and technical analysis of suction caisson foundations for offshore wind turbines[J]. China water transportation, 2023, 23(11): 133-135.
[16] FU D F, ZHOU Z F, YAN Y, et al.A method to predict the torsional resistance of suction caisson with anti-rotation fins in clay[J]. Marine structures, 2021, 75: 102866.
[17] 张浦阳, 魏宇墨, 校建东, 等. 复合筒型基础在粉土中的抗扭承载特性研究[J]. 太阳能学报, 2021, 42(9): 270-278.
ZHANG P Y, WEI Y M, XIAO J D, et al.Torsional bearing capacity of composite bucket foundation in silty sand[J]. Acta energiae solaris sinica, 2021, 42(9): 270-278.
[18] 王海军, 余洪晨, 闫晓荣, 等. 桩筒组合基础地基承载力特性研究[J]. 太阳能学报, 2021, 42(9): 312-317.
WANG H J, YU H C, YAN X R, et al.Research on bearing capacity characteristics of pile-bucket combined foundation[J]. Acta energiae solaris sinica, 2021, 42(9): 312-317.
[19] BUTTERFIELD R, HOULSBY G T, GOTTARDI G.Standardized sign conventions and notation for generally loaded foundations[J]. Géotechnique, 1997, 47(5): 1051-1054.
[20] FU D F, GAUDIN C, TIAN Y H, et al.Uniaxial capacities of skirted circular foundations in clay[J]. Journal of geotechnical and geoenvironmental engineering, 2017, 143(7): 04017022.
基金
中国电力工程顾问集团有限公司科技项目（DG2-T04-2023）; 国家自然科学基金（42177122）
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