Centrifugal model tests on effects of spudcan penetration on adjacent steel cylinder in clay
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摘要: 某拟建水下油气生产系统采用大直径薄壁钢圆筒作为防护设施。自升式钻井船进行钻修井作业时，桩靴插拔会产生较大范围的挤土作用，当钻井船插拔桩位置靠近水下生产系统的防护设施时，会导致钢圆筒产生附加的应力和变形，从而对水下生产系统产生影响。为此开展离心模型试验，研究黏土中不同桩靴插桩深度，不同间距对水下生产系统防护设施钢圆筒的影响。研究表明，钢圆筒的筒壁应变、筒顶变形及筒壁土压力均随筒靴间距的增加而减小，随桩靴贯入深度的增加而增加，与桩靴下压阻力同步发展。插桩引起的筒身应变主要集中在正对桩靴一侧，当筒靴间距小于0.9倍桩靴直径时，钢圆筒筒壁发生屈服；筒顶位移主要为向筒内发展的水平向位移；筒壁土压力增量约为静止土压力的0.6倍。桩靴插桩对钢圆筒的影响范围超过了1.3倍的桩靴直径。Abstract: An underwater oil and gas production system is proposed to adopt large-diameter thin-walled steel cylinder as a protective facility. When the jackup drilling ship is operating, the insertion and removal of spudcans will cause a wide range of soil squeezing. When the insertion and removal position of spudcans is close to the underwater protection facilities, the stability of the underwater protection facilities and their foundation will be seriously affected. For this reason, the centrifuge model tests are carried out to study the influences of different depths and spacings of a spudcan in clay on the steel cylinder of the protective facilities. The results show that the wall strain, top deformation and wall earth pressure of steel cylinder decrease with the increase of the cylinder-spudcan distance, and increase with the increase of the spudcan depth, and develop synchronously with the pressure resistance of the spudcan. When the cylinder-spudcan distance is less than 0.9 times the diameter of the spudcan, the wall of the steel cylinder will yield. The top deformation of the cylinder is mainly the horizontal displacement developed into the cylinder. The increment of the earth pressure on the cylinder wall is 0.6 times that of static earth pressure. The influence range of the spudcan on the steel cylinder exceeds 1.3 times the diameter of the spudcan.
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Keywords:
- underwater production system /
- steel cylinder /
- spudcan penetration /
- centrifugal model test /
- stress /
- deformation
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图 10 不同间距L土压力增量对比
Figure 10. Comparison of increments of earth pressure under different spacings
表 1 黏土参数
Table 1 Parameters of clay
参数 数值 土粒相对质量密度Gs 2.65 液限wL/% 48.4 塑限wp/% 27.3 饱和重度γ/(kN·m-3) 19.5 含水率w/% 14.0 
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表 2 试验方案
Table 2 Test schemes
次序 筒靴间距
L/mm桩靴贯入深度
H / mm加载速率
v/(mm·s-1)C1 90 50 0.5 C2 144 50 0.5 C3 180 50 0.5
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