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Analysis of lateral bearing capacity of wing-monopile with symmetrical wing plates
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摘要: 影响加翼桩水平承载性能的因素众多，其中翼板数量、荷载方向与翼板夹角是主要影响因素。采用ABAQUS有限元计算软件研究了软黏土地基中桩径为5.0 m，对称布置二、三和四翼板的加翼桩在不同荷载作用方向时桩身泥面水平位移、桩身倾斜率、桩身内力、桩身应力和极限承载力等的变化。通过与相同条件单桩的承载特性对比，分析了加翼桩水平承载性能提升幅度，明确了翼板通过同时或交替承担底面端承力、侧面摩擦阻力、水平土抗力和增加桩身抗弯刚度以提高其水平承载性能的机理，拟合了对称布置二、三和四翼板加翼桩水平极限承载力随荷载作用方向变化的计算式，对加翼桩极限承载力控制条件进行了对比分析。Abstract: There are many factors that affect the lateral bearing capacity of wing-monopile, among which the number of wing plates, the angle between load direction and wing plates are the main influencing factors. The ABAQUS finite element calculation software was used to calculate the horizontal displacement of the pile at mud surface, tilt rate, internal force, stress and ultimate bearing capacity of 5 m diameter wing-monopile in the soft clay foundation with two, three and four symmetrical wing plates under different load directions. By comparing with the bearing characteristics of monopile under the same conditions, the extent of improvement of the lateral bearing capacity of the wing-monopile was analyzed, the mechanism for the wing plates to improve the lateral load-bearing performance by simultaneously or alternately bearing the end force, side frictional resistance, lateral earth pressure, and increasing the bending stiffness of the pile was clarified, the calculation formula of the lateral ultimate bearing capacity of wing-monopile with two, three and four symmetrical wing plates under load was proposed, and the control conditions of the ultimate bearing capacity of the wing-monopile were compared and analyzed.
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图 2 加翼桩荷载-桩身泥面最大位移曲线
Figure 2. Curve of load-maximum displacement of pile at mud surface
图 3 各荷载级加翼桩桩身倾斜率随加载方向变化曲线
Figure 3. Curve of tilt rate of wing-monopile at different load levels as a function of loading direction
图 4 单桩及四翼板加翼桩桩身弯矩（H=12.0 MN）
Figure 4. Moment of monopile and four wing plates wing-monopile （H=12.0 MN）
图 5 12.0 MN作用时翼板附近桩身弯矩
Figure 5. Moment of the wing-monopile near the wings (H=12.0 MN)
图 6 对称布置四翼板加翼桩剪力分布（H =12.0 MN）
Figure 6. Shear force distribution of four wing plates wing-monopile (H=12.0 MN)
图 7 荷载方向与加翼桩极限承载力比值关系曲线
Figure 7. Curve of load direction and ultimate bearing capacity ratio of wing-monopile
表 1 加翼桩和地基土体主要参数
Table 1. Summary table of main parameters of wing-monopile and foundation soil
材料 密度/（kg·m−3） 弹性模量/GPa 压缩模量/MPa 泊松比 黏聚力/kPa 内摩擦角/° 剪胀角/° 加翼桩 7 850 206 / 0.3 / / / 土体 1 960 / 7.5 0.4 25 14 7 
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表 2 加翼桩极限承载力
Table 2. Ultimate bearing capacity of wing-monopile
单桩 二翼板 三翼板 四翼板 极限承载力/MN 荷载方向/° 极限承载力/MN 荷载方向/° 极限承载力/MN 荷载方向/° 极限承载力/MN 10.36 0 11.67 0 11.06 0 12.10 22.50 10.85 15.00 10.87 11.25 11.49 45.00 10.62 30.00 10.96 22.50 11.19 67.50 10.67 45.00 11.34 33.75 10.96 90.00 10.70 60.00 11.85 45.00 10.87
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