钻井船插拔桩对邻近桩影响的模型试验
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摘要
为评价黏土中钻井船插、拔桩对邻近桩基础的影响,开展了自由桩头条件下的1g模型试验,得出插、拔桩过程中所测量物理量数据变化规律,为后续离心模型试验提供了数据基础和试验方法。试验得到各物理量变化规律如下:插桩条件下,随着插桩深度的增加,邻近桩桩身最大弯矩产生的位置及最大土体水平位移产生的位置逐渐加深;拔桩条件下,最大桩身弯矩及最大土体位移值逐渐减小,但拔桩完成后桩身位移和土体位移都未恢复到初始桩状态;插桩初始阶段插桩阻力迅速增加,之后逐渐趋于稳定,拔桩初始阶段拔桩阻力迅速增加,随后进入相对稳定阶段,在桩靴距离土体表面约120 mm时,阻力突降为0。试验分析结果表明,土体位移变化直接导致桩身响应变化,两者存在一定正相关性。
In order to evaluate the spudcan penetration and extraction effects on the adjacent piles,the free pile head model tests are carried out in clay under 1 g conditions. The change laws of various physical quantities in the process are given by the model tests,and test data and testing methods for the subsequent centrifugal model tests are obtained. The model testing results show that when the spudcan penetrates deeper,the position where the maximum pile moment and the maximum soil displacement appear along the pile becomes deeper. As the spudcan elevates,the maximum pile moment and the maximum soil displacement decrease. However,after finishing of the model tests,the moment along the pile and the soil displacement do not return to their initial state. In the initial stage of the spudcan penetration,the resistance of the spudcan penetration increases rapidly and then gradually stabilizes. And the resistance of the spudcan extraction increases rapidly and then remains relatively stable during the initial stage of the spudcan extraction. When the spudcan shoe is about 120 mm away from the soil surface,the resistance suddenly drops to zero. The testing analysis results show that the displacement change of the soil mass directly leads to the change of the pile body response,and there is a positive correlation between them.
In order to evaluate the spudcan penetration and extraction effects on the adjacent piles,the free pile head model tests are carried out in clay under 1 g conditions. The change laws of various physical quantities in the process are given by the model tests,and test data and testing methods for the subsequent centrifugal model tests are obtained. The model testing results show that when the spudcan penetrates deeper,the position where the maximum pile moment and the maximum soil displacement appear along the pile becomes deeper. As the spudcan elevates,the maximum pile moment and the maximum soil displacement decrease. However,after finishing of the model tests,the moment along the pile and the soil displacement do not return to their initial state. In the initial stage of the spudcan penetration,the resistance of the spudcan penetration increases rapidly and then gradually stabilizes. And the resistance of the spudcan extraction increases rapidly and then remains relatively stable during the initial stage of the spudcan extraction. When the spudcan shoe is about 120 mm away from the soil surface,the resistance suddenly drops to zero. The testing analysis results show that the displacement change of the soil mass directly leads to the change of the pile body response,and there is a positive correlation between them.
引文
[1] TAN X M,GUO J Y,LU C. Effect of spudcan penetration on neighboring existing pile[C]∥Proceedings of 16th International Offshore and Polar Engineering Conference,San Francisco,2006:516-523.
[2]吴永韧,鲁晓兵.桩靴贯入对固定平台基础扰动的数值模拟[C]∥第十四届中国海洋(岸)工程学术讨论会论文集.呼和浩特,2009:118-122.(WU Yongren,LU Xiaobing. Numerical simulation of spudcan penetration disturbance to pile foundations of fixed platform[C]∥The fourteenth China Marine(Offshore)Engineering Symposium. Huhehaote,2009:118-122.(in Chinese))
[3] KELLEZI L,SUNDARARAJAN S. Spudcan-soil-jacket pile group foundation interaction during jack-up rig installation and removal[C]∥14th International Jack-up Conference,2013:1-12.
[4] THO K K,CHUN F L,CHOW Y K,et al. Eulerian finite element simulation of spudcan-pile interaction[J]. Canadian Geotechnical Journal,2013,50(6):595-608.
[5] HOSSAIN M S,HU Y,RANDOLPH M F,et al. Limiting cavity depth for spudcan foundations penetrating clay[J].Géotechnique,2005,55(9):679-690.
[6] SPRINGMAN S M. Lateral loading on piles due to simulated embankment construction[D]. Cambridge:University of Cambridge,1989.
[7] STEWART D P. Lateral loading of piled bridge abutments due to embankment construction[D]. Perth:University of Western Australia,1992.
[8] LEE C Y,POULOS H G,HULL T S. Effect of seafloor instability on offshore pile foundations[J]. Canadian Geotechnical Journal,1991,28(5):729-737.
[9]吴永韧,鲁晓兵,王淑云,等. Spudcan基础贯入对固定平台基础影响[J].中国海洋平台,2008,23(1):35-38.(WU Yongren,LU Xiaobing,WANG Shuyun,et al. Effects of spud-can on pile foundation of fixed platform[J]. China Offshore Platform,2008,23(1):35-38.(in Chinese))
[10] SICILIANO R J,HAMILTON J M,MURFF J D,et al. Effect of jackup spudcans on piles[C]∥Offshore Technology Conf OTC Paper No 6467. Houston,USA,1990.
[11] CRAIG W H. Spud-can foundations:installation with deep penetration and subsequent removal[J]. Geotechnical Engineering,2015,131(3):146-151.
[12] XIE Y. Centrifuge model study onspudcan-plie interaction[D]. Singapore:National University of Singapore,2009.
[13]程星磊.软黏土不排水循环弹塑性本构关系及其在海洋中锚固基础变形分析中的应用[D].天津:天津大学,2014.(CHENG Xinglei. Undrained cyclic elastoplastic constitutive relation for soft clays and its application in the deformation analysis of marine anchor foundation[D]. Tianjin:Tianjin University,2014.(in Chinese))
[14]王越,杨亮.自升式钻井平台简论[J].船舶设计通讯,2011(增刊1):73-80.(WANG Yue,YANG Liang. Brief introduction on jack up drilling units[J]. Journal of Ship Design,2011(Suppl1):73-80.(in Chinese))
[2]吴永韧,鲁晓兵.桩靴贯入对固定平台基础扰动的数值模拟[C]∥第十四届中国海洋(岸)工程学术讨论会论文集.呼和浩特,2009:118-122.(WU Yongren,LU Xiaobing. Numerical simulation of spudcan penetration disturbance to pile foundations of fixed platform[C]∥The fourteenth China Marine(Offshore)Engineering Symposium. Huhehaote,2009:118-122.(in Chinese))
[3] KELLEZI L,SUNDARARAJAN S. Spudcan-soil-jacket pile group foundation interaction during jack-up rig installation and removal[C]∥14th International Jack-up Conference,2013:1-12.
[4] THO K K,CHUN F L,CHOW Y K,et al. Eulerian finite element simulation of spudcan-pile interaction[J]. Canadian Geotechnical Journal,2013,50(6):595-608.
[5] HOSSAIN M S,HU Y,RANDOLPH M F,et al. Limiting cavity depth for spudcan foundations penetrating clay[J].Géotechnique,2005,55(9):679-690.
[6] SPRINGMAN S M. Lateral loading on piles due to simulated embankment construction[D]. Cambridge:University of Cambridge,1989.
[7] STEWART D P. Lateral loading of piled bridge abutments due to embankment construction[D]. Perth:University of Western Australia,1992.
[8] LEE C Y,POULOS H G,HULL T S. Effect of seafloor instability on offshore pile foundations[J]. Canadian Geotechnical Journal,1991,28(5):729-737.
[9]吴永韧,鲁晓兵,王淑云,等. Spudcan基础贯入对固定平台基础影响[J].中国海洋平台,2008,23(1):35-38.(WU Yongren,LU Xiaobing,WANG Shuyun,et al. Effects of spud-can on pile foundation of fixed platform[J]. China Offshore Platform,2008,23(1):35-38.(in Chinese))
[10] SICILIANO R J,HAMILTON J M,MURFF J D,et al. Effect of jackup spudcans on piles[C]∥Offshore Technology Conf OTC Paper No 6467. Houston,USA,1990.
[11] CRAIG W H. Spud-can foundations:installation with deep penetration and subsequent removal[J]. Geotechnical Engineering,2015,131(3):146-151.
[12] XIE Y. Centrifuge model study onspudcan-plie interaction[D]. Singapore:National University of Singapore,2009.
[13]程星磊.软黏土不排水循环弹塑性本构关系及其在海洋中锚固基础变形分析中的应用[D].天津:天津大学,2014.(CHENG Xinglei. Undrained cyclic elastoplastic constitutive relation for soft clays and its application in the deformation analysis of marine anchor foundation[D]. Tianjin:Tianjin University,2014.(in Chinese))
[14]王越,杨亮.自升式钻井平台简论[J].船舶设计通讯,2011(增刊1):73-80.(WANG Yue,YANG Liang. Brief introduction on jack up drilling units[J]. Journal of Ship Design,2011(Suppl1):73-80.(in Chinese))