分舱板对海上风机混凝土筒型基础承载模式的影响
|
摘要
出于拖航稳性、施工下沉、精细调平及结构强度的原因,混凝土筒型基础筒内须设置分舱板。一般设计时不考虑分舱板对承载力的作用,实际上分舱板的存在对于筒型基础的承载模式和承载能力本身是有一定的影响。通过数值模型定量对比带分舱板和无分舱板两种混凝土筒型基础的承载特性,得到分舱板对承载模式的影响。结果显示带分舱板的基础与无分舱板的基础承载模式基本相似,当荷载较小时分舱板对承载力的作用不明显,因此基础设计时可以不考虑分舱板的作用,但随着荷载的增加,分舱板对承载力的提高作用逐渐显现,当达到极限承载时,基础竖向承载力提高6.9%,水平承载力提高18.3%,弯矩承载力提高16.5%,在极端条件下,带分舱板的混凝土筒型基础将具有更大的安全储备。
For towing stability,sinking,fine leveling construction and structural strength purposes,it is necessary to set bulkheads in the concrete bucket foundation.Usually the influence of bulkheads on the bearing capacity of a foundation is not considered,however,bulkheads actually have a certain influence on the bearing mode and bearing capacity.The influence of bulkheads on the bearing mode was quantitatively analyzed by the comparison of two concrete bucket foundations with and without bulkheads.The results show that the bearing modes of two foundations with and without bulkheads are similar.No obvious effect on the bearing capacity when the load is small,so it is reasonable that not to consider the role of the bulkheads in foundation design,but as the load increases,the effect of bulkheads on the bearing capacity improvement gradually appears,when the bucket foundation reaches the ultimate bearing capacity,6.9% of vertical bearing capacity,18.3% of horizontal bearing capacity and 16.5% of bending bearing capacity increase,which means that in extreme conditions a concrete bucket foundation with bulkheads will have greater safety margin.
For towing stability,sinking,fine leveling construction and structural strength purposes,it is necessary to set bulkheads in the concrete bucket foundation.Usually the influence of bulkheads on the bearing capacity of a foundation is not considered,however,bulkheads actually have a certain influence on the bearing mode and bearing capacity.The influence of bulkheads on the bearing mode was quantitatively analyzed by the comparison of two concrete bucket foundations with and without bulkheads.The results show that the bearing modes of two foundations with and without bulkheads are similar.No obvious effect on the bearing capacity when the load is small,so it is reasonable that not to consider the role of the bulkheads in foundation design,but as the load increases,the effect of bulkheads on the bearing capacity improvement gradually appears,when the bucket foundation reaches the ultimate bearing capacity,6.9% of vertical bearing capacity,18.3% of horizontal bearing capacity and 16.5% of bending bearing capacity increase,which means that in extreme conditions a concrete bucket foundation with bulkheads will have greater safety margin.
引文
[1]丁红岩,张浦阳.多筒系缆平台原型顶升试验研究[J].岩土力学,2008,29(6):1585―1588.Ding Hongyan,Zhang Puyang.Prototype tests duringpull up processes of a multi-bucket foundation dolphinplatform[J].Rock and Soil Mechanics,2008,29(6):1585―1588.(in Chinese)
[2]刘树杰,王忠涛,栾茂田.单向荷载作用下海上风机多桶基础承载特性数值分析[J].海洋工程,2010,28(1):31―35.Liu Shujie,Wang Zhongtao,Luan Maotian.Numericalanalysis of bearing capacity behavior of multi-bucketsuctional foundation for offshore wind turbine undermonotonic loading[J].The Ocean Engineering,2010,28(1):31―35.(in Chinese)
[3]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 Qinglai,Luan Maotian.Failure envelopes of bucketfoundation for offshore wind turbines in V-H-T loadingspace[J].China Civil Engineering Journal,2010,43(4):113―118.(in Chinese)
[4]武科,栾茂田,范庆来,王志云.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 Ke,Luan Maotian,Fan Qinglai,Wang Zhiyun.Numerical analysis of failure envelopes of bucketfoundation subjected to combined loads based onelasto-plastic fem[J].Engineering Mechanics,2008,25(11):156―161.(in Chinese)
[5]武科,栾茂田,范庆来,王志云.复合加载模式下桶形基础破坏包络面特性研究[J].岩土工程学报,2008,30(4):574―580.Wu Ke,Luan Maotian,Fan Qinglai,Wang Zhiyun.Failure envelopes of bucket foundation subjected tocombined loads[J].Chinese Journal of GeotechnicalEngineering,2008,30(4):574―580.(in Chinese)
[6]孙曦源,栾茂田,唐小微.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):667―672.Sun Xiyuan,Luan Maotian,Tang Xiaowei.Study ofhorizontal bearing capacity of bucket foundation onsaturated soft clay ground[J].Rock and Soil Mechanics,2010,31(2):667―672.(in Chinese)
[7]别社安,徐元锡,祝业浩.增强结构气浮稳性的分舱法及优化分析[J].中国港湾建设,2003,23(1):1―4.Bie Shean,Xu Yuanxi,Zhu Yehao.Optimization andanalysis of cabin method to improve air floating stability[J].China Harbour Engineering,2003,23(1):1―4.(inChinese)
[8]Huang S.Stability analysis of the heave motion ofmarine cable-body systems[J].Ocean Engineering,1999,26(6):531―546.
[9]Tan F S C.Centrifuge and theoretical modeling ofconical footings on sand[D].UK:Cambridge University,1990.
[10]武科.滩海吸力式桶形基础承载力特性研究[D].大连:大连理工大学,2007.Wu Ke.A study on bearing capacity behavior of suctionbucket foundation in beach-shallow sea[D].Dalian:Dalian University of Technology,2007.(in Chinese)
[2]刘树杰,王忠涛,栾茂田.单向荷载作用下海上风机多桶基础承载特性数值分析[J].海洋工程,2010,28(1):31―35.Liu Shujie,Wang Zhongtao,Luan Maotian.Numericalanalysis of bearing capacity behavior of multi-bucketsuctional foundation for offshore wind turbine undermonotonic loading[J].The Ocean Engineering,2010,28(1):31―35.(in Chinese)
[3]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 Qinglai,Luan Maotian.Failure envelopes of bucketfoundation for offshore wind turbines in V-H-T loadingspace[J].China Civil Engineering Journal,2010,43(4):113―118.(in Chinese)
[4]武科,栾茂田,范庆来,王志云.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 Ke,Luan Maotian,Fan Qinglai,Wang Zhiyun.Numerical analysis of failure envelopes of bucketfoundation subjected to combined loads based onelasto-plastic fem[J].Engineering Mechanics,2008,25(11):156―161.(in Chinese)
[5]武科,栾茂田,范庆来,王志云.复合加载模式下桶形基础破坏包络面特性研究[J].岩土工程学报,2008,30(4):574―580.Wu Ke,Luan Maotian,Fan Qinglai,Wang Zhiyun.Failure envelopes of bucket foundation subjected tocombined loads[J].Chinese Journal of GeotechnicalEngineering,2008,30(4):574―580.(in Chinese)
[6]孙曦源,栾茂田,唐小微.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):667―672.Sun Xiyuan,Luan Maotian,Tang Xiaowei.Study ofhorizontal bearing capacity of bucket foundation onsaturated soft clay ground[J].Rock and Soil Mechanics,2010,31(2):667―672.(in Chinese)
[7]别社安,徐元锡,祝业浩.增强结构气浮稳性的分舱法及优化分析[J].中国港湾建设,2003,23(1):1―4.Bie Shean,Xu Yuanxi,Zhu Yehao.Optimization andanalysis of cabin method to improve air floating stability[J].China Harbour Engineering,2003,23(1):1―4.(inChinese)
[8]Huang S.Stability analysis of the heave motion ofmarine cable-body systems[J].Ocean Engineering,1999,26(6):531―546.
[9]Tan F S C.Centrifuge and theoretical modeling ofconical footings on sand[D].UK:Cambridge University,1990.
[10]武科.滩海吸力式桶形基础承载力特性研究[D].大连:大连理工大学,2007.Wu Ke.A study on bearing capacity behavior of suctionbucket foundation in beach-shallow sea[D].Dalian:Dalian University of Technology,2007.(in Chinese)