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Analysis of calculating method for horizontal bearing capacity of wing-monopile
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摘要: 加翼桩作为海上风电基础的新型结构，目前相关研究甚少。基于ABAQUS三维数值仿真模型，对比分析了海上风电大直径单桩与加翼桩在水平荷载作用下桩身弯矩、应力、位移、泥面处桩基倾斜率、极限承载力以及破坏模式等水平承载性能。研究了大直径单桩和加翼桩桩身与翼板土压力分布，基于计算结果和桩土作用机理，参考现行规范中P-Y曲线模式，对相关系数进行修正，提出软黏土地基大直径单桩P-Y曲线。根据加翼桩翼板面积、形状、刚度和埋深等翼板参数对加翼桩水平承载性能影响的研究成果，提出基于大直径单桩承载力的软黏土地基大直径加翼桩极限承载力经验式和加翼桩翼板参数影响系数的计算式，为加翼桩的研究和运用提供了技术支撑。Abstract: The wing-monopile is a new structure of the offshore wind turbine generator foundation, on which there are few studies. Based on ABAQUS three-dimensional numerical simulation model, the horizontal bearing performances of the large diameter monopile and wing-monopile were analyzed and compared under the conditions of the horizontal loads, including the bending moment, stress, displacement, inclination rates of pile at mud surface, ultimate bearing capacity and failure mode of the pile. Based on the calculation results of soil pressure distribution on the pile and the mechanism of soil-pile interaction, the P-Y curve of the large-diameter monopile in soft clay foundation was developed by referring to the P-Y curve model in the current specification, and the correlation coefficient was corrected. According to the research results of the influences of the area, shape, stiffness and buried depth of the wing plate on the horizontal bearing capacity of the wing-monopile, the empirical formula and the calculation formulas of the correlation coefficients of the ultimate bearing capacity of the large diameter wing-monopile in soft clay foundation are presented by referring to the specifications for the bearing capacity of the large diameter monopile, which can provide a technical support for the research and application of the wing-monopile in the marine environment.
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Key words:
- large diameter /
- wing-monopile /
- wing plate parameters /
- P-Y curve /
- bearing capacity
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图 1 极限荷载作用下单桩水平位移云图(单位：m)
Figure 1. Horizontal displacement cloud diagram of monopile under ultimate load(unit: m)
图 2 极限荷载作用下加翼桩水平位移云图(单位：m)
Figure 2. Horizontal displacement cloud diagram of wing-monopile under ultimate load(unit: m)
图 3 水平荷载与桩身最大弯矩曲线
Figure 3. Horizontal loads and maximum bending moment curves of pile body
图 4 水平荷载与泥面处水平位移曲线
Figure 4. Horizontal loads and horizontal displacement curves at mud surface of pile
图 5 水平荷载作用下桩身应力云图(H=9.0 MN)(单位：Pa)
Figure 5. Stress cloud chart of wing-monopile body under horizontal loads (H=9.0 MN)(unit: Pa)
图 6 水平极限承载力时单桩和加翼桩接触压应力云图(单位：Pa)
Figure 6. Contact compress stress cloud chart of monopile under horizontal ultimate bearing capacity(unit: Pa)
图 9 大直径桩桩侧土抗力与位移
Figure 9. Lateral soil resistance pressure and displacement of large diameter pile
表 1 基桩模型翼板参数
Table 1. Wing plate parameters of pile foundation
编号 形状 翼板宽W/m 翼板长L/m 埋深z/m 相对刚度(EI/(E0I0)) 备注 MP - - - - 1.0 单桩 FPA 矩形 8.0(1.6D) 8.0(1.6D) 0 1.0 最大面积 FPJ 矩形 8.0(1.6D) 3.125(0.39D) 0 1.0 最佳长宽比 FPT 梯形 8.0(1.6D)~2.0(0.4D)(上~下) 5.0(D) 0 1.0 最佳形状 FPZ 正方形 5.0(D) 5.0(D) 1.0(0.2D) 1.0 最佳埋深 FPEI 正方形 5.0(D) 5.0(D) 0 2.0 最佳刚度 
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表 2 单桩和加翼桩水平极限承载力及相应应力
Table 2. Horizontal ultimate bearing capacity and stresses of monopile and wing-monopile
基桩编号 极限水平承载力/MN 加翼桩/单桩/% 泥面处倾斜率/‰ 桩身最大应力/MPa MP
FPA
FPJ
FPT
FPZ
FPEI8.88
14.97
13.83
14.60
13.12
12.65100
168.58
155.74
164.41
147.75
142.454.00
4.00
4.00
4.00
4.00
4.00150.64
144.05
221.77
248.04
213.42
199.70
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