基于离心试验的衡重式桩板挡墙受力特性研究  

Centrifugal test-based study on mechanical behaviors ofsheet pile wall with relieving platform

作　　者：张明 胡荣华[3] 刘国楠 王威[4] 潘效鸿[5] ZHANG Ming;HU Ronghua;LIU Guonan;WANG Wei;PAN Xiaohong(College of Civil Engineering,Henan University of Engineering,Zhengzhou 451191,Henan,China;Shenzhen Research and Design Institute of China Academy of Railway Sciences,Shenzhen 518034,Guangdong,China;Developer&Operator of New Industry Cities,China Fortune Land Development,Beijing 100027,China;Institute of Earthquake Resistance and Disaster Reduction,Beijing University of Technology,Beijing 100124,China;The First Branch of Shenzhen Municipal Land Resources and Housing Administrative Bureau,Shenzhen 518034,Guangdong,China)

机构地区：[1]河南工程学院土木工程学院,河南郑州451191 [2]中国铁道科学研究院深圳研究设计院,广东深圳518034 [3]华夏幸福基业股份有限公司产业新城,北京100027 [4]北京工业大学抗震减灾研究所,北京100124 [5]深圳市国土资源和房产管理局直属分局,广东深圳518034

出　　处：《水利水电技术》2019年第10期145-152,共8页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(51678017);郑州市科技发展计划(153PKJGG137)

摘　　要：衡重式桩板挡墙是由桩板挡墙与衡重式挡墙发展而来的一种新型支挡结构,鉴于该结构的复杂性,受力特性尚不明确,为此设计了比例尺为1∶50的挡墙离心模型试验,分析了衡重式桩板挡墙的土压力分布模式、桩身受力特性。结果表明:(1)填料为全砂时上墙主动土压力按公式γhk aξ计算,建议正常使用状态下桩前抗力上部采用C法、下部采用m法计算。(2)填料上层为砂土、下层为粉土或饱和粉土时,挡墙主动土压力已不适合采用朗肯土压力理论计算,桩前抗力分布模式与模型试验一致,随深度呈抛物线分布,不适于采用m法或C法及朗肯被动土压力理论计算。(3)挡墙桩身弯矩在桩顶下某处出现反弯点,反弯点以上桩身左侧受拉,反弯点以下桩身右侧受拉,随着离心加速度的增加反弯点逐渐下移。The sheet pile wall with relieving platform is a new type of retaining structure developed from sheet pile retaining wall and balance weight retaining wall.Because of its complexity,the mechanical behaviors of the structure remain unclear.Therefore,a retaining wall centrifugal model test with a scale of 1∶50 is designed,and then both the earth pressure distribution mode and the mechanical behaviors of pile body of the sheet pile wall with relieving platform are analyzed.The result shows that(1)when earth-fill is made by full sand,the active earth pressure of the upper part of the wall can be calculated by the formulaγhk aξ,while it is suggested that the upper resistance force in front of the pile is to be calculated by the c method and the lower resistance force in front of the pile is to be calculated by the m method under normal working state.(2)When the upper layer of the ear-fill is made by sand and the lower layer is made by silty soil or saturated silty soil,the active earth pressure on the retaining wall is not suitable to be calculated with Rankine earth pressure theory and the distribution mode of the resistance force in front of the pile is consistent with that from the model test and then is not suitable to be calculated by c method and Rankine passive earth pressure theory,which exhibits a parabolical distribution along with the depth and then is not suitable to be calculated by m method or c method and Rankine passive earth pressure theory.(3)An inflection point of the bending moment of the pile body occurs at a point under the pile top,while the left side of the pile body is tensed above the inflection point and the right side of the pile body is tensed under the inflection point,for which the inflection point is gradually moved down along with the increase of the centrifugal acceleration.

关 键 词：衡重式桩板挡墙 离心试验 土压力 桩前抗力 朗肯土压力理论 

分 类 号：TU413[建筑科学—岩土工程]