海洋平台大直径钢管桩溜桩区间计算方法
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摘要
溜桩作为海洋平台大直径钢管桩施工过程中常见的工程事故,影响成桩质量和工程进度。本研究对溜桩区间进行合理的预测和判断,结合工程实际对溜桩产生的原因进行分析。采用静力平衡方程求出溜桩发生时的钢管桩入泥深度;计算钢管桩第二次溜桩区间时考虑了溜桩对桩侧摩阻力的影响,并将桩侧摩阻力分成三个影响区计算;使用积分学方法,对沉桩阻力做功进行计算;利用功、能原理列出钢管桩能量方程,求出溜桩长度,进而得出溜桩区间。实例计算与实测结果对比显示,新计算方法的溜桩区间计算结果与实际情况误差范围为8%～16%,具有较高的准确度。新计算方法计算结果与现场实测数据吻合较好,可为工程中预测钢管桩溜桩区间提供参考。
In offshore platform engineering,pile running often occurs during the driving process of large-diameter pipe piles and it will affect the quality of pile-forming and engineering process.This study aims to make predictions and assessments of pile running intervals.The causes of pile running in practical engineering were first analyzed.The pile-running depth of steel pipe piles was calculated using static equilibrium equation.While calculating the second pile running interval,the influence of pile running on skin friction was considered and was divided into three influential areas.The work of pile-sinking resistance was calculated using integral calculus.The transformation equation of energy of piles was given by using the principle of work and power to obtain the length and then the interval of pile running.The calculation obtained in the actual case study was compared with the measured results.The comparison indicates that with an error range of 8%-16%,the proposed method has higher accuracy in pile running interval prediction.This can provide a reference for predicting the interval of pile running in projects,since the calculated results are in higher conformity with the measured data.
In offshore platform engineering,pile running often occurs during the driving process of large-diameter pipe piles and it will affect the quality of pile-forming and engineering process.This study aims to make predictions and assessments of pile running intervals.The causes of pile running in practical engineering were first analyzed.The pile-running depth of steel pipe piles was calculated using static equilibrium equation.While calculating the second pile running interval,the influence of pile running on skin friction was considered and was divided into three influential areas.The work of pile-sinking resistance was calculated using integral calculus.The transformation equation of energy of piles was given by using the principle of work and power to obtain the length and then the interval of pile running.The calculation obtained in the actual case study was compared with the measured results.The comparison indicates that with an error range of 8%-16%,the proposed method has higher accuracy in pile running interval prediction.This can provide a reference for predicting the interval of pile running in projects,since the calculated results are in higher conformity with the measured data.
引文
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[11]ZHANG L,CHEN J.Effect of spatial correlation of standard penetration test(SPT)data on bearing capacity of driven piles in sand[J].Canadian Geotechnical Journal,2012,49(4):394-402.
[12]STEVENS R F.The effect of a soil plug on pile drivability in clay[C]∥Proceedings of the 3rd International Conference on the Application of Stress Wave Theory to Piles.Ottawa:1988:861-868.
[13]李飒,吴兴州,王耀存,等.打桩过程中考虑溜桩影响的土阻力研究[J].岩土工程学报,2015,37(6):1150-1157.LI Sa,WU Xingzhou,WANG Yaocun,et al.Soil resistance to driving considering effect of pile running on pile installation[J].Chinese Journal of Geotechnical Engineering,2015,37(6):1150-1157.
[14]CHEN J J,ZHANG L.Effect of spatial correlation of cone tip resistance on the bearing capacity of piles[J].Journal of Geotechnical&Geoenvironmental Engineering,2015,139(3):494-500.
[15]HWANG J H,LIANG N,CHEN C H.Ground response during pile driving[J].Journal of Geotechnical&Geoenvironmental Engineering,2001,127(11):939-949.
[2]孙立强,贾天强,闫澍旺,等.大直径管桩沉桩过程中溜桩判断方法研究[J].中国石油大学学报(自然科学版),2016,40(2):115-122.SUN Liqiang,JIA Tianqiang,YAN Shuwang,et al.Research on prediction of pile running during large diameter pipe piles driving[J].Journal of China University of Petroleum(Edition of Natural Sciences),2016,40(2):115-122.
[3]尹汉军,刘玉玺,张孝卫,等.大直径超长钢桩溜桩长度计算新方法[J].中国海上油气,2014,26(增1):35-38.YIN Hanjun,LIU Yuxi,ZHANG Xiaowei,et al.The new method for free-fall analysis of large diameter and super-long steel pile[J].China Offshore Oil and Gas,2014,26(S1):35-38.
[4]DOVER A R,DAVIDSON J.Large diameter steel pipe piles running under self weight in soft clay:Predicted vs.observed behavior-Richmond San-Rafael Bridge seismic retrofit[C]∥11th Triennial International Conference on Ports,2007:1-10.
[5]闫澍旺,贾沼霖,孙立强,等.大直径超长钢管桩溜桩机理及计算方法研究[J].工程力学,2015,32(9):158-164.YAN Shuwang,JIA Zhaolin,SUN Liqiang,et al.Mechanisms and calculation of pile-run for long and large diameter piles[J].Engineering Mechanics,2015,32(9):158-164.
[6]RANDOLPH M F.Science and empiricism in pile foundation design[J].Geotechnique,2003,53(10):847-876.
[7]贾沼霖.海洋平台大直径超长桩动态沉桩阻力及溜桩机制研究[D].天津:天津大学,2016.
[8]SOM N N,DAS S C.Theory and practice of foundation design[J].Tourism&Hospitality Research,2014,13(3):125-139.
[9]KUITER J D,BERINGEN F L.Pile foundations for large North Sea structures[J].Marine Geotechnology,1978,3(3):267-314.
[10]张海山,杨进,严德,等.海上钻井隔水导管打入作业溜桩深度预测[J].石油钻采工艺,2013,35(3):22-24.ZHANG Haishan,YANG Jin,YAN De,et al.Study on the slip pile depth prediction for offshore drilling conductor installation[J].Oil Drilling&Production Technology,2013,35(3):22-24.
[11]ZHANG L,CHEN J.Effect of spatial correlation of standard penetration test(SPT)data on bearing capacity of driven piles in sand[J].Canadian Geotechnical Journal,2012,49(4):394-402.
[12]STEVENS R F.The effect of a soil plug on pile drivability in clay[C]∥Proceedings of the 3rd International Conference on the Application of Stress Wave Theory to Piles.Ottawa:1988:861-868.
[13]李飒,吴兴州,王耀存,等.打桩过程中考虑溜桩影响的土阻力研究[J].岩土工程学报,2015,37(6):1150-1157.LI Sa,WU Xingzhou,WANG Yaocun,et al.Soil resistance to driving considering effect of pile running on pile installation[J].Chinese Journal of Geotechnical Engineering,2015,37(6):1150-1157.
[14]CHEN J J,ZHANG L.Effect of spatial correlation of cone tip resistance on the bearing capacity of piles[J].Journal of Geotechnical&Geoenvironmental Engineering,2015,139(3):494-500.
[15]HWANG J H,LIANG N,CHEN C H.Ground response during pile driving[J].Journal of Geotechnical&Geoenvironmental Engineering,2001,127(11):939-949.