基于极限平衡法的单桶多隔舱结构防波堤稳定性分析
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摘要
借助ABAQUS软件,采用拟静力法分析结构在水平力下的运动模式及作用于基础桶土压力随水平荷载增加的变化规律。结果表明,结构在水平力作用下绕某点转动,转动中心随荷载增大而改变,极限状态下处于结构中轴线位置;作用于基础桶的土压力可分为主动、静止和被动3个区域。在此基础上,推导了适用于该结构稳定性分析的极限平衡法,鉴于其部分假定导致一定的误差,相比于数值模拟结果,极限平衡法计算值平均偏大20%~25%,但2种方法得到的抗倾覆安全系数随土性、结构参数变化发展趋势基本一致。
The breakwater with multi-compartment single-bucket structure is a new type of structure applied in soft foundations. To explore the stress characteristics of multi-compartment single-bucket structure breakwater under horizontal loading is of great importance in its stability analysis. In this study,quasi-static force is adopted to analyze the motion mode and the earth pressure development acting on the structure as horizontal load increases.The results show that the structure rotates around a point below its foundation base under the acting of horizontal force. The rotation center moves to the axis position of the structure when reaching limit state. Meanwhile,earth pressures on the foundation bucket can be divided into active pressure,passive pressure and static pressure. On the basis of above conclusions,the limit equilibrium method is derived to analyze its stability. In addition,comparison of the anti-overturning safety factor between critical equilibrium method and finite element calculation shows that the difference between two data sets is about 20% ~ 25%,because of their different assumptions. Theoretical results are larger and the parametric changing tendency in limit equilibrium method agrees well with that of numerical simulation,which provides some reference data for theoretical design system of breakwater with multi-compartment single-bucket structure.
The breakwater with multi-compartment single-bucket structure is a new type of structure applied in soft foundations. To explore the stress characteristics of multi-compartment single-bucket structure breakwater under horizontal loading is of great importance in its stability analysis. In this study,quasi-static force is adopted to analyze the motion mode and the earth pressure development acting on the structure as horizontal load increases.The results show that the structure rotates around a point below its foundation base under the acting of horizontal force. The rotation center moves to the axis position of the structure when reaching limit state. Meanwhile,earth pressures on the foundation bucket can be divided into active pressure,passive pressure and static pressure. On the basis of above conclusions,the limit equilibrium method is derived to analyze its stability. In addition,comparison of the anti-overturning safety factor between critical equilibrium method and finite element calculation shows that the difference between two data sets is about 20% ~ 25%,because of their different assumptions. Theoretical results are larger and the parametric changing tendency in limit equilibrium method agrees well with that of numerical simulation,which provides some reference data for theoretical design system of breakwater with multi-compartment single-bucket structure.
引文
[1]林捷,贺瑞,郑金海.海上风力发电机桶形基础竖向初始动阻抗影响因素分析[J].河海大学学报(自然科学版),2017,45(3):263-270.(LIN Jie,HE Rui,ZHENG Jinhai. Analysis of factors influencing vertical initial dynamic impedance of bucket foundations for offshore wind turbine[J]. Journal of Hohai University(Natural Sciences),2017,45(3):263-270.(in Chinese))
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[7]杨会东,杨立功.沉入式新型桶式防波堤抗倾滑移定性计算[J].水运工程,2016(4):40-44.(YANG Huidong,YANG Ligong.Computation method of anti-sliding stability of new bucket breakwater[J]. Port&Waterway Engineering,2016(4):40-44.(in Chinese))
[8]肖忠,王元战,及春宁.基于极限平衡法的箱筒型基础防波堤稳定性分析[J].岩土工程学报,2013,35(5):828-833.(XIAO Zhong,WANG Yuanzhan,JI Chunning. Stability analysis of bucket foundation breakwaters based on limit equilibrium method[J]. Chinese Journal of Geotechnical Engineering,2013,35(5):828-833.(in Chinese))
[9]蒋敏敏,蔡正银,肖昭然.箱筒型基础防波堤基础筒土压力数值模拟研究[J].水运工程,2012(3):20-23.(JIANG Minmin,CAI Zhengyin,Xiao Zhaoran. Numerical study on earth pressure on foundation bucket of bucket foundation breakwater[J]. Port and Waterway Engineering,2012(3):20-23.(in Chinese))
[10]ZHOU Mi,HOSSAIN M S,HU Yuxia,et al. Behaviour of ball penetrometers in uniform and layered clays[J]. Geotechnique,2013,63(8):682-694.
[11]曹永勇.单桶多隔舱结构防波堤与软土地基相互作用研究[D].南京:南京水利科学研究院,2014.
[12]陈海峰,李武.桶式防波堤离心模型试验[J].水运工程,2016(3):57-61.(CHEN Haifeng,LI Wu. Centrifugal model test of bucket-based breakwater[J]. Port and Waterway Engineering,2016(3):57-61.(in Chinese))
[13]陈页开.挡土墙上土压力的试验研究与数值分析[J].岩石力学与工程学报,2002,21(8):1275-1279.(CHEN Yekai.Testing study and numerical analysis on earth pressure on retaining wall[J]. Chinese Journal of Rock Mechanics and Engineering,2002,21(8):1275-1279.(in Chinese))
[14]BRANSBY M F,YUN G J. The undrained capacity of skirted strip foundations under combined loading[J]. Geotechnique,2009,59(2):115-125.
[2]ZHOU Mi,HOSSAIN M S,HU Yuxia,et al. Installation of stiffened caissons in Non-Homogeneous clays[J]. Journal of Geotechnical and Geoenviroment Engineering,2016,142(2):1-14.
[3]王元战,肖忠,李元音,等.筒型基础防波堤土压力性状的有限元分析[J].岩土工程学报,2009,31(4):622-627.(WANG Yuanzhan,XIAO Zhong,LI Yuanyin,et al. Finite element analysis for earth pressure on bucket foundation of breakwater[J]. Chinese Journal of Geotechnical Engineering,2009,31(4):622-627.(in Chinese))
[4]蔡正银,杨立功,关云飞,等.新型桶式基础防波堤单桶桶壁土压力数值分析[J].水利水运工程学报,2016(10):39-46.(CAI Zhengyin,YANG Ligong,GUAN Yunfei. Numerical analysis of soil pressure on single bucket wall of new bucket foundation breakwater[J]. Hydro-Science and Engineering,2016(10):39-46.(in Chinese))
[5]孙曦源,栾茂田,唐小薇.饱和软黏土地基中桶形基础水平承载力研究[J].岩土力学,2010,31(2):668-672.(SUN Xiyuan,LUAN Maotian,TANG Xiaowei. Study of horizontal bearing capacity of bucket foundation on saturated soft clay ground[J]. Rock and Soil Mechanics,2010,31(2):668-672.(in Chinese))
[6]杨立功,蔡正银.沉入式桶式基础防波堤抗倾覆稳定性计算[J].水利水运工程学报,2015(4):61-68.(YANG Ligong,CAI Zhengyin. A computation method for stability against overturning of embedded bucket foundation breakwater[J]. HydroScience and Engineering,2015(4):61-68.(in Chinese))
[7]杨会东,杨立功.沉入式新型桶式防波堤抗倾滑移定性计算[J].水运工程,2016(4):40-44.(YANG Huidong,YANG Ligong.Computation method of anti-sliding stability of new bucket breakwater[J]. Port&Waterway Engineering,2016(4):40-44.(in Chinese))
[8]肖忠,王元战,及春宁.基于极限平衡法的箱筒型基础防波堤稳定性分析[J].岩土工程学报,2013,35(5):828-833.(XIAO Zhong,WANG Yuanzhan,JI Chunning. Stability analysis of bucket foundation breakwaters based on limit equilibrium method[J]. Chinese Journal of Geotechnical Engineering,2013,35(5):828-833.(in Chinese))
[9]蒋敏敏,蔡正银,肖昭然.箱筒型基础防波堤基础筒土压力数值模拟研究[J].水运工程,2012(3):20-23.(JIANG Minmin,CAI Zhengyin,Xiao Zhaoran. Numerical study on earth pressure on foundation bucket of bucket foundation breakwater[J]. Port and Waterway Engineering,2012(3):20-23.(in Chinese))
[10]ZHOU Mi,HOSSAIN M S,HU Yuxia,et al. Behaviour of ball penetrometers in uniform and layered clays[J]. Geotechnique,2013,63(8):682-694.
[11]曹永勇.单桶多隔舱结构防波堤与软土地基相互作用研究[D].南京:南京水利科学研究院,2014.
[12]陈海峰,李武.桶式防波堤离心模型试验[J].水运工程,2016(3):57-61.(CHEN Haifeng,LI Wu. Centrifugal model test of bucket-based breakwater[J]. Port and Waterway Engineering,2016(3):57-61.(in Chinese))
[13]陈页开.挡土墙上土压力的试验研究与数值分析[J].岩石力学与工程学报,2002,21(8):1275-1279.(CHEN Yekai.Testing study and numerical analysis on earth pressure on retaining wall[J]. Chinese Journal of Rock Mechanics and Engineering,2002,21(8):1275-1279.(in Chinese))
[14]BRANSBY M F,YUN G J. The undrained capacity of skirted strip foundations under combined loading[J]. Geotechnique,2009,59(2):115-125.