密实含砂碎石和卵石地层钢管桩沉桩试验研究
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Experimental study of steel pipe pile driving in dense sand-bearing gravel and cobble stratum
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    摘要:

    钢管桩是海洋工程最广泛采用的桩型,复杂地层条件下钢管桩沉桩施工往往具有较大的难度。依托实际工程,基于地层原位试验、沉桩模型试验、基桩可打性分析、现场足尺试验,开展密实含砂碎石和卵石地层钢管桩沉桩施工试验研究。结果表明:1)采用人工模拟地层进行模型试验,桩侧土摩阻力试验结果应适当提高。2)密实含砂碎石和卵石地层中钢管桩桩端闭塞系数可取0.7~1.0、桩侧单位面积摩阻力可取225 kPa、桩端单位面积阻力可取不低于13 MPa。3)密实含砂碎石和卵石地层中钢管桩振动和冲击法沉桩困难,为达到设计入土深度可能需要通过恰当的方法清除桩内部分土塞。

    Abstract:

    Steel pipe piles are the most widely used type of piles in marine engineering. Nevertheless,steel pipe pile driving under complex stratum conditions is often difficult. By investigating an actual project,this paper presents an experimental study of the construction of steel pipe pile driving in a dense sand-bearing gravel and cobble stratum through the stratum in-situ test,pile driving model test,drivability analysis of the foundation pile,and full-scale field test. The results support the following conclusions:1)The experimental results of pile skin-soil friction resistance need proper improvement due to the use of the artificial simulated stratum for model test. 2)For a dense sand-bearing gravel and cobble stratum,a range of 0.7-1.0 is available for the blocking coefficient of the steel pipe pile tip,225 kPa is advisable for the unit friction resistance on the pile skin,and the unit resistance at the pile tip should not be less than 13 MPa. 3)Vibration and impact methods have trouble driving steel pipe piles in a dense sand-bearing gravel and cobble stratum. Consequently,achieving the designed penetration depth might require that part of the soil plugs inside the pile be removed by an appropriate method.

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赵刘群,娄学谦,胡兴昊,等.密实含砂碎石和卵石地层钢管桩沉桩试验研究[J].水运工程,2022(9):166-171.

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  • 在线发布日期: 2022-09-13
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