基于高性能桩单元法的海上风机单桩支撑结构水平承载力研究  

RESEARCH ON HORIZONTAL BEARING CAPACITY OF MONOPILE SUPPORTING STRUCTURE OF OFFSHORE WIND TURBINE BASED ON EFFICIENT PILE FINIT-ELEMENT METHOD

作　　者：张舒烨 刘思威[2] 马会环 ZHANG Shu-ye;LIU Si-wei;MA Hui-huan(School of Civil Engineering,Sun Yat-sen University,Zhuhai,Guangdong 519082,China;Department of Civil and Environmental Engineering,Hong Kong Polytechnic University,Hong Kong 999077,China)

机构地区：[1]中山大学土木工程学院,广东珠海519082 [2]香港理工大学土木及环境工程学系,中国香港999077

出　　处：《工程力学》2023年第11期99-109,共11页Engineering Mechanics

基　　金：国家自然科学基金项目(52008410);香港教育资助局优配研究金(GRF)项目(PolyU/21E/15203121)。

摘　　要：海上风力发电机单桩支撑结构由单桩、过渡段和锥形塔筒组成。海洋土体变异性大和风机塔筒变截面的特点大幅增大了使用离散弹簧法进行支撑结构计算的梁单元划分量。为实现对风机支撑结构的高效模拟,该文提出了一种改进的欧拉-伯努利梁单元,该单元实现了桩土相互作用关系的内置和对单元变截面的考虑,相较于传统梁单元大幅度减少了单元划分量。该文在单层与多层土体中验证了上述单元的精确性与高效性,并研究了新型单元在风机单桩支撑结构计算中的适用性。在此基础上,进行了风机单桩水平承载性能参数分析,研究了桩长与桩径对大直径桩水平变形规律和承载力的联合影响,研究给出了不同于现有规范的刚性短桩-中长桩划分的相对刚度特征值临界范围。The monopile supporting structure of offshore wind turbine is composed of monopiles,transitions and conical towers.The large variability of Marine Soil and the characteristic of variable cross-section of wind turbine tower greatly increase the number of divided beam elements in finite element calculation of supporting structures using discrete spring method.In order to achieve efficient simulation of monopile supporting structure,an improved Euler-Bernoulli beam element was proposed in this paper.This element realized the built-in relationship between pile and soil,and could consider the variable section effect of tower section.Compared with traditional beam element,the number of divided elements was reduced greatly by using the improved element.The accuracy and efficiency of the improved element was verified in single-layer and multi-layer soil,and the applicability of the element to the calculation of monopile supporting structure was studied.This paper carried out a parameter analysis of monopile lateral bearing capacity,which analyzed the combined influence of pile length and diameter on lateral deformation characteristics and bearing capacity of large diameter piles.And the research suggested a new critical range of relative stiffness eigenvalues between rigid short pile and medium long pile,which is different from that given in existing standard.

关 键 词：桩基工程 桩土相互作用 数值模拟 有限单元法 锥形梁 P-Y曲线 

分 类 号：TU473.12[建筑科学—结构工程]