嵌岩单桩水平静力加载现场试验及 p-y 曲线研究  

Field test of lateral static loading of rock-socketed monopiles andstudy of p-y curve

作　　者：刘俊伟[1] 吕伟 陈水月 于秀霞[1] LIU Junwei;LYU Wei;CHEN Shuiyue;YU Xiuxia(School of Civil Engineering,Qingdao University of Technology,Qingdao 266500,China;The First Company of China Eighth Engineering Bureau Ltd,Jinan 250000,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266500 [2]中建八局第一建设有限公司,山东济南250000

出　　处：《哈尔滨工程大学学报》2024年第10期1941-1949,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(42277135);国家自然科学基金-山东联合基金项目(U2006225);山东省优秀青年基金项目(ZR2021YQ31);泰山学者工程专项经费(tsqn202211176).

摘　　要：为研究风化花岗岩地质条件下嵌岩单桩的受荷响应和p-y曲线规律,本文基于现场试验,开展了水平静力荷载作用下嵌岩单桩的荷载-位移关系、弯矩、桩身变形及p-y曲线响应研究。试验表明:在所研究的相对深度范围内,随着z/D的增加,岩土阻力和相应位移都减小,上部荷载很难传递到深部岩层;桩身最大弯矩在3~4倍桩径之间,极限荷载主要取决于桩身强度而不是岩土体。将p-y曲线分别与一般双曲函数和双曲正切函数进行拟合,评估现有p-y曲线模型在风化花岗岩地基中的适用性,修正了模型在风化岩层中的参数取值。结果表明:一般双曲函数在较浅区域拟合良好,相对深度较大的区域数据离散性较强;双曲正切函数在各深度处拟合优度均较好。分析结果简化了现场p-y曲线的预测程序。In order to study the load response and p-y curve pattern of rock-socketed monopiles under weathered granite geological conditions,a study on the load-displacement relationship,bending moment,pile deformation and p-y curve response of rock-socketed monopiles under horizontal static load was carried out based on field tests.The tests show that:in the relative depth range studied,the geotechnical resistance and the corresponding displacement decrease as z/D increases,and it is difficult to transfer the upper load to the deeper rock layers;the maximum pile bending moment is between 3-4 times the pile diameter,and the ultimate load depends mainly on the pile strength rather than the rock.For a more accurate assessment of the p-y curve model's applicability in the weathered granite foundation,the general hyperbolic function and hyperbolic tangent function were used to fit the data.Using a broad hyperbolic function yields better fits for data in the shallower part of the domain while yielding more discrete results for data in the deeper part of the domain.It is recommended to utilise the hyperbolic tangent function to improve the fit at each level.The analysis results simplify the prediction program of field p-y curve.

关 键 词：海上风电 嵌岩单桩 现场试验 静载试验 桩-岩相互作用 受荷响应 P-Y曲线 风化花岗岩 

分 类 号：TU452[建筑科学—岩土工程]