针对海上风电钢桩架基础中土-桩界面力学特性,基于自主开发的界面剪切试验仪以及PFC离散元数值模拟软件,在相同粗糙度条件下设置3种形貌特征的结构面,重点研究并揭示结构面形貌对砂-钢界面剪切特性的影响规律。结果表明：1）不同形貌的结构面界面力学特性随粗糙度的增加呈现相似变化趋势,界面峰值剪应力及界面效率随粗糙度的增加而增加,但当结构面形貌深度达到颗粒中值粒径D50时增长趋势发生转折,此时对应的粗糙度可视为临界粗糙度,而后剪应力及界面效率平缓变化;2）形貌深度较小时,不同结构面形貌对于界面峰值剪应力影响较大,在达到临界粗糙度时差距达到最大,随着形貌深度的逐渐增大,由不同结构面形貌带来的影响逐渐减小,结构面峰值剪应力趋于相同;3）剪切带厚度随形貌深度的增大而增大,随着深度的持续增大,剪切带厚度逐渐保持平缓变化,结构面凹槽数量越多,剪切带厚度值越大。
Abstract
Steel pile jacket foundations are widely used in offshore wind power engineering, where the mechanical properties of the soil-steel pile interface largely determine the bearing capacity of the foundation. In this study, based on a self-developed interface shear testing apparatus and PFC （particle flow code） discrete element numerical simulations, three types of structural planes with different morphological characteristics were examined under identical roughness conditions to investigate the influence of surface topography on the shear characteristics of the sand-steel interface. The results indicate that： 1） The mechanical behavior of interfaces with different morphologies exhibits similar trends with increasing roughness. Both peak shear stress and interface efficiency increase with roughness until reaching a critical roughness value, which corresponds to a morphological depth equal to D50 （median grain size）. Beyond this critical point, shear stress and interface efficiency change gradually. 2） When the morphological depth is small, different structural surface topographies significantly affect peak interface shear stress, with the maximum difference occurring at the critical roughness. As morphological depth increases, the influence of different structural surface topographies diminishes, and peak shear stresses converge to similar values. 3） Shear band thickness increases with morphological depth and then stabilizes as depth continues to increase. Furthermore, structural surface with a greater number of grooves exhibit larger shear band thicknesses.
关键词
海上风电 /
粗糙度 /
剪切带 /
颗粒流程序 /
结构面形貌 /
砂-钢界面
Key words
offshore wind power /
interface roughness /
shear band /
particle flow code（PFC） /
structural surface morphology /
sand-steel interface
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基金
国家自然科学基金面上项目（52378357）; 辽宁省自然科学基金（2022-BS-195）; 辽宁省教育厅高校基本科研项目（JYTMS20231608）; 沈阳市优秀中青年科技人才项目（RC230805）
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