公路桥梁桩基础受竖向荷载桩侧土接触面损伤机理模型试验研究  

Experimental Study on Damage Mechanism Model of Pile-soil Contact Surface of Highway Bridge Pile Foundation Subjected to Vertical Load

作　　者：叶妤文 麦健 张学峰[3] YE Yu-wen;MAI Jian;ZHANG Xue-feng(Guangdong Chaoshan Ring Expressway Co.,Ltd.,Guangzhou Guangdong 510000,China;Ningxia Road Transport Affairs Center,Yinchuan Ningxia 750002,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China)

机构地区：[1]广东潮汕环线高速公路有限公司,广东广州510000 [2]宁夏道路运输事务中心,宁夏银川750002 [3]交通运输部公路科学研究院,北京100088

出　　处：《公路交通科技》2021年第6期104-111,共8页Journal of Highway and Transportation Research and Development

摘　　要：我国公路桥梁建设规模巨大,桥梁基础的安全是公路桥梁安全运营的根本。钻孔灌注桩基础承载能力大、工艺成熟,是公路桥梁广泛采用的基础形式。为掌握公路桥梁桩基础受力过程安全与否,需要摸清桩基础受竖向荷载桩侧土接触面的损伤机理。首先构建桩土作用模型,在桩身任意深度处取一微分桩段由平衡条件建立桩土作用微分方程,通过大量桩基工程试桩试验和本研究进行的室内模型试验及相关研究成果给出公路桥梁钻孔灌注桩基τ-S关系曲线,开展理论分析研究了钻孔灌注桩基础受荷机理和桩土作用传递函数;然后进行桩土接触面损伤机理研究,建立了公路桥梁桩基础受竖向荷载桩侧土接触面损伤指数和损伤传递函数模型,为桩基础受竖向荷载损伤分析提供依据;再进行了25组桩-土接触面损伤模型试验,试验采用5种有代表性土样,每种土样分别模拟10,20,30,40,50 m深度工况,深入研究了公路桥梁桩基础受竖向荷载桩侧土接触面损伤机理。通过试验测试数据与本研究提出的桩土接触面损伤指数和损伤传递函数模型计算结果进行分析比较,验证了该模型的适用性和可靠性;最后对理论研究成果和模型试验研究成果进行分析,并得出初步结论供相关工程设计和研究人员参考。The scale of highway bridge construction of China is huge,and the safety of bridge foundation is the essential of safe operation of highway bridges.The bored pile foundations have large bearing capacity and mature technology,which are widely used in highway bridges.In order to know whether the pile foundation of highway bridge is safe or not,it is necessary to find out the damage mechanism of the pile-soil contact surface of highway bridge pile foundation under the vertical load.First,a pile-soil interaction model is built.Taking a differential pile segment at any depth of the pile body,a differential equation for the pile-soil interaction is established based on equilibrium conditions.Theτ-S relationship curve of the highway bridge bored pile foundation is given through a large number of pile foundation engineering pile tests,the indoor model tests carried out in this research and related research results,and the theoretical analysis is carried out to study the loading mechanism of the bored pile foundation and the pile-soil interaction transfer function.Then,the damage mechanism of the pile-soil contact surface is studied,the damage index and damage transfer function model of the pile-soil contact surface of highway bridge pile foundation under vertical load are established,which can provide a basis for the pile foundation damage analysis under vertical load.After that,25 groups of pile-soil interface damage model tests are carried out.Five representative soil samples are used in the tests,each soil sample is used to simulate the working conditions of 10,20,30,40,50 m respectively,and the mechanism of pile-soil interface damage under vertical load is deeply studied.The test data are analyzed and compared with the calculation result of the proposed pile-soil contact surface damage index and damage transfer function model,and the applicability and reliability of the model are verified.Finally,the theoretical research result and model experimental research result are analyzed,and preliminary conclusions are drawn

关 键 词：桥梁工程 损伤机理 模型试验 桩土接触面 传递函数 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]