- 摘 要
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(1 浙江杭紹甬高速公路有限公司， 杭州 310014；2 中路高科交通檢測檢驗認證有限公司， 北京 100088)
［摘要］基樁水平承載力特征值通常由基樁容許水平變形值確定。連續(xù)結構（如橋梁）更關注墩頂水平位移容許限值對基樁水平承載性能的影響，判定連續(xù)跨越工程單樁水平承載力特征值時，應綜合考慮基樁變形以及墩臺變形限值等因素。通過分析剛性墩、柔性墩的水平變形特征，并根據墩柱變形限值要求得到海床（地面）處基樁的水平位移限值的分布特征。在此基礎上，結合地基土承載特性，提出采用墩頂水平位移容許限值和海床（地面）處樁身水平位移限值兩項指標綜合判定連續(xù)結構（如橋梁）單樁水平承載力特征值的方法。結合實體工程試樁進行了實例分析，分析結果表明：判定的試樁單樁水平承載力特征值小于根據相關規(guī)范得到的判定值，說明通過試樁試驗分析單樁水平承載性能的方法合理可行。
［關鍵詞］大直徑基樁；水平承載力特征值；靜載法；位移
中圖分類號：TU473 文獻標識碼：A文章編號：1002-848X(2021)22-0135-06
Research on determination method of characteristic value of horizontal bearing capacity of large diameter pile in continuous structure
ZHANG Xingzhi1, PIAO Long1, YANG Yu2
(1 Zhejiang Hang-Shao-Yong Expressway Co., Ltd., Hangzhou 310014，China；2 China-Road Transportation Verification & Inspection Hi-Tech Co., Ltd., Beijing 100088， China)
Abstract: The characteristic value of horizontal bearing capacity of a pile was usually determined by its allowable horizontal deformation value. Since the horizontal bearing capacity of a pile in continuous structure such as bridge was usually considered to be influenced by the allowable horizontal displacement of the pier or the abutment over the pile, the deformation limit of the pile and the pier or the abutment should be considered comprehensively during the determination of characteristic value of horizontal bearing capacity of a bridge pile. The horizontal deformation characteristics of rigid pier and flexible pier were analyzed, and the distribution characteristics of the horizontal displacement limits of pile body at the seabed (ground) were obtained according to the provisions of the allowable horizontal displacement limits of the top surface of pier or abutment. On these basis, combined with the bearing characteristics of the foundation soil, the determination method of the characteristic value of the horizontal bearing capacity of the single pile in bridge engineering was put forward, which was controlled by the two indexes of the allowable displaeement of the top surface of pier or abutment and the horizontal displacement of the pile body at the seabed (ground).An example was analyzed combined with a pile test project. The analysis shows that the characteristic value of horizontal bearing capacity of a single pile determined is less than that obtained according to relevant codes. Therefore, it is still reasonable to determine the horizontal bearing capacity of a single pile through pile testing.
Keywords:large-diameter pile； characteristic value of horizontal bearing capacity； static load method； displacement
作者簡介：張興志，碩士，高級工程師，Email： 83511136@qq.com； 通信作者：楊宇，博士，正高級工程師，注冊巖土工程師、注冊道路工程師，Email：402051135@qq.com。
