基于内聚力模型的嵌岩双斜桩水平承载特性分析  

Horizontal bearing characteristics of double-inclined rock-socketed piles based on cohesion model

作　　者：叶青 郭伟[1,2] 任宇晓[1,2] 庄道坤[1,2] 崔赛月 YE Qing;GUO Wei;REN Yuxiao;ZHUANG Daokun;CUI Saiyue(School of Civil Engineering,Tianjin University,Tianjin 300072,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300072

出　　处：《岩土工程学报》2024年第S01期233-238,共6页Chinese Journal of Geotechnical Engineering

摘　　要：基于已有的对桩-岩界面剪切特性的研究,建立了界面几何参数和材料特性与内聚力模型参数间的转换关系,与现场试验和理论研究对比,验证了接触模型的准确性;结合室内嵌岩双斜桩模型试验,建立了对应有限元数值计算模型,对比分析了桩基荷载-位移曲线与弯矩规律,验证了模型的可靠性;进而建立不同倾角的足尺嵌岩双斜桩模型,分析在不同竖向定荷载下的水平承载特性。研究表明:嵌岩双斜桩系统是多因素协同作用的承载系统,对受多向组合荷载的嵌岩双斜桩而言,存在一最优竖向设计荷载,使得嵌岩双斜桩的水平承载力大大提高,但过大的竖向荷载和过小的倾角反而提高桩承台失稳的风险。Based on the existing researches on the shear characteristics of the pile-rock interface,the conversion relationship between the interface geometric parameters and the material properties and the parameters of the cohesion model is established.The accuracy of the contact model is verified by comparing with the field tests and theoretical studies.Combined with the indoor model tests on double-inclined rock-socketed piles,the corresponding finite element numerical model is established.The load-displacement curve and bending moment law of pile foundation are compared and analyzed,and the reliability of the model is verified.Then the full-scale model for the double-inclined rock-socketed piles with different dip angles is established to analyze the horizontal bearing characteristics under different vertical fixed loads.The results show that the rock-socketed system is a bearing system with synergistic effects of multiple factors.There is an optimal vertical design load that makes the horizontal bearing capacity of the double-inclined rock-socketed piles be greatly improved for are subjected to multi-directional combined loads.However,too large vertical loads and too small dip angles will increase the risk of pile cap instability.

关 键 词：嵌岩双斜桩 桩-岩接触 模型试验 数值模拟 承载特性 

分 类 号：TU43[建筑科学—岩土工程]