成层土中长桩竖向承载激发规律研究  

Research on Vertical Bearing Excitation Law of Long Piles in Layered Soil

作　　者：马鹏程 刘润[2] 李国和 苏伟 施威 蒋成强 MA Pengcheng;LIU Run;LI Guohe;SU Wei;SHI Wei;JIANG Chengqiang(China Railway Design Corporation,Tianjin 300308,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300354,China;China National Engineering Research Center for Digital Construction and Evaluation of Urban Rail Transit,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308 [2]天津大学建筑工程学院,天津300354 [3]城市轨道交通数字化建设与测评技术国家工程研究中心,天津300308

出　　处：《河北工程大学学报（自然科学版）》2024年第2期23-29,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：天津市科技计划项目(20YFZCSN00890);中国铁路设计集团有限公司科技开发重点课题(2022A02538004,2020YY241008);国铁集团科技研究开发青年科研专项(Q2023G022)。

摘　　要：针对成层土中长桩承载问题,结合试桩数据建立了成层土中长桩-土相互作用特性分析模型,基于分析模型研究了上砂下黏和上黏下砂中砂-黏占比对长桩竖向荷载-位移曲线的影响,分析了成层土中长桩侧阻和端阻承载分担比,揭示了达到极限承载力时成层土中桩基侧阻、端阻激发规律,即黏土层侧阻可完全激发、砂土层侧阻未完全激发,桩底端阻完全激发,为实际工程中长桩承载力计算选取合理参数提供依据。A model for analyzing the interaction characteristics between long piles and soil in layered soil is established based on test pile data to address the bearing problem of long piles in layered soil.Based on the analysis model,the influence of sand to clay ratio on the vertical load displacement curve of long piles is studied.The lateral and end resistance bearing ratios of long piles in layered soil are an-alyzed,and the excitation laws of lateral and end resistance of pile foundations in layered soil are re-vealed when the ultimate bearing capacity is reached.It is shown that the lateral resistance of the clay layer can be fully excited,the lateral resistance of the sand layer is not fully excited,and the resistance at the bottom of the pile is fully excited.The results provide a basis for selecting reasonable parameters for calculating the bearing capacity of long piles in practical engineering.

关 键 词：长桩 成层土 竖向承载力 现场试验 砂-黏占比 

分 类 号：TU43[建筑科学—岩土工程]