地震弱化土石混合体地基单桩p-y曲线  

A P-Y CURVE OF SINGLE PILE IN SEISMIC WEAKENING SOIL-ROCK MIXTURE FOUNDATION

作　　者：韦领新 曾章波 黄华 裴志勇 方火浪[1] WEI Lingxin;ZENG Zhangbo;HUANG Hua;PEI Zhiyong;FANG Huolang(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Powerchina Huadong Engineering Corporation Limited,Hangzhou 311122,China)

机构地区：[1]浙江大学建筑工程学院,杭州310058 [2]中国电建集团华东勘测设计研究院有限公司,杭州311122

出　　处：《低温建筑技术》2023年第9期35-39,共5页Low Temperature Architecture Technology

基　　金：国家自然科学基金资助项目(51878605)。

摘　　要：为研究不同强度地震作用下土石混合体地基中的桩-土相互作用力学行为,文中以白鹤滩水电站库区某高桩码头建设工程为背景,根据现场试验获得的土体参数建立了桩-土相互作用有限元模型。通过数值模拟分析,研究了土石混合体地基中桩周水平土抗力与桩身水平位移之间的关系,分析了土体等效动剪切模量对p-y曲线初始刚度和桩周极限土抗力的影响。利用Davidenkov函数,引入等效地基模量,建立了地震弱化土石混合体地基的单桩p-y曲线模型。将文中模型的计算结果与有限元数值模拟和现场试验结果进行了比较,表明模型能够有效模拟不同强度地震作用下土石混合体地基的p-y关系,从而验证了模型的合理性。In order to study the mechanical behavior of pile-soil interaction in soil-rock mixture foundation under different intensity earthquake actions,a finite element model of pile-soil interaction is established based on the soil parameters obtained from in-situ tests.Taking the construction project of a high pile wharf in the reservoir area of Baihetan Hydropower Station as the case,the relationship between the horizontal soil resistance around the pile and the horizontal displacement of the pile body in the soil-rock mixture foundation is studied through numerical simula⁃tion analyses.The influence of the equivalent dynamic shear modulus of the soil on the initial stiffness of the p-y curve and the ultimate soil resistance around the pile is analyzed.Using the Davidenkov function and introducing the equivalent foundation modulus,a p-y curve model for a single pile in seismic weakening soil-rock mixture founda⁃tion is established.The calculation results of the proposed model are compared with the finite element numerical sim⁃ulation and in-situ test results,indicating that the model can effectively simulate the p-y relationship of soil-rock mixture foundation under different intensity earthquake actions,and thus verifying the rationality of the model.

关 键 词：土石混合体 P-Y曲线 初始刚度 极限土抗力 地基模量 

分 类 号：TU432[建筑科学—岩土工程]