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粘土地基中桩径为5m,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。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,拟合了对称布置二翼板、三翼板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公式,对加翼桩极限承载力控制条件进行了对比分析,以期为加翼桩的推广应用提供技术支撑。 |
关键词: 加翼桩 翼板数量 荷载方向 极限承载力 |
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基金项目:国家重点研发计划资助项目(2018YFF0215005);南京水利科学研究院中央级公益性科研院所基本科研业务费专项资金资助项目(Y418001) |
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Calculation And Analysis of Lateral Bearing Capacity of Wing-monopile with Two,Three and Four Symmetrical Wing Plates |
HE Jianxin, CHEN Canming, LI Zhi, SU Xiaodong
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Nanjing Hydraulic Research Institute
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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 5m diameter wing-monopile in the soft soil 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 is 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 is clarified,the calculation formula of the lateral ultimate bearing capacity of wing-monopile with two, three and four symmetrical wing plates under load is proposed, the control conditions of the ultimate bearing capacity of wing-monopile is compared and analyzed, which provides technical support for the promotion and application of wing-monopile. |
Key words: wing-monopile number of wing plates load direction ultimate bearing capacity |