深基坑桩锚放坡组合支护结构变形及内力分析  

Analysis of deformation and internal force of pile-anchor-slope composite retaining structures for deep foundation pit

作　　者：时轶磊 曹程明 龙照 王小龙 闫文进 SHI Yilei;CAO Chengming;LONG Zhao;WANG Xiaolong;YAN Wenjin(Gansu CSCEC Municipal Engineering Investigation and Design Institute Co.,Ltd.,Lanzhou 730000,China;CSCEC Aecom Consultants Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]甘肃中建市政工程勘察设计研究院有限公司,甘肃兰州730000 [2]中国市政工程西北设计研究院有限公司,甘肃兰州730000

出　　处：《甘肃科学学报》2024年第6期1-6,18,共7页Journal of Gansu Sciences

基　　金：甘肃省科技计划项目自然科学基金(20JR10RA570);甘肃省科技计划项目重点研发计划-工业类(23YFGA0083)。

摘　　要：深基坑桩锚放坡组合支护结构的受力及变形受到多种因素的影响。研究依托某复杂环境下的深基坑工程,基于PLAXIS 2D有限元软件,建立深基坑桩锚放坡组合支护结构有限元模型。通过设置不同的放坡高度、放坡坡率、平台宽度,分析了以上因素对基坑变形、支护桩水平位移、支护桩内力以及锚杆受力的影响规律。结果表明:设置平台具有明显的卸荷作用,平台宽度变化对基坑稳定性有重要影响,随着平台宽度的增大,可采用的坡率以及坡高均有明显的增加。放坡高度对坡率的选用范围具有明显影响,高度过大将导致基坑的变形急剧增大。放坡坡率可选范围较为广泛,可根据坡高以及设置平台情况灵活选用。研究结果可为桩锚放坡组合基坑支护结构的研究以及工程应用提供一定的指导。The force and deformation of combined pile-anchor slope retaining structure in deep foundation pit are affected by many factors.Based on a deep foundation pit project in a complex environment and PLAXIS 2D finite element software,the finite element model of the composite support structure of pile-anchor-slope was established.By setting different slope height,slope rate and platform width,the influence rules of the above factors on the deformation of foundation pit,horizontal displacement of supporting pile,internal force of supporting pile and stress of anchor rod were analyzed.The results showed that the setting of platform has obvious unloading effect,and the change of platform width has important influence on the stability of foundation pit.With the increase of platform width,the available slope rateand slope height increase obviously.The slope height has obvious influence on the selection range of slope rate,and the deformation of foundation pit will increase sharply if the height is too large.The slope rate has a wide range of options,which can be flexibly selected according to the slope height and the setting of the platform.The results of this study can provide some guidance for the research and engineering application of pile-anchored-slope composite deep foundation pit support structure.

关 键 词：桩锚支护结构 深基坑 水平位移 平台宽度 数值模拟 

分 类 号：TU922[建筑科学—建筑设计及理论]