公路砂性土地基水泥土搅拌桩加固效果分析  

ANALYSIS ON REINFORCEMENT EFFECT OF CEMENT SOIL MIXING PILE ON HIGHWAY SANDY SOIL FOUNDATION

作　　者：周身平 刘泽[2] 陈高 严文钦 李洪 Zhou Shen-ping;Liu Ze;Chen Gao;Yan Wen-qin;Li Hong

机构地区：[1]浙江交工国际工程有限公司,杭州310051 [2]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《建筑技术开发》2022年第15期136-140,共5页Building Technology Development

基　　金：浙江省交通科技项目(2020004);浙江省建设科技项目(2021K123)。

摘　　要：以濮卫高速公路K29+633.5断面填砂路堤结构为背景,建立水泥土搅拌桩加固地基的桩承砂性路堤三维数值分析模型,探讨桩承砂性路堤的稳定性及桩体复合地基的荷载传递规律、竖向和水平位移等工作性状。研究表明:天然路堤边坡达到临界状态时,潜在滑动面表现出从坡脚向路堤面延伸的趋势,虽然并未完全贯通,但为满足工后沉降要求,需进行地基加固处理;对路堤下软基进行加固处理后,较大减少了路堤整体变形,相比天然地基,路堤竖向最大沉降值在施工各阶段降幅大致为16.10%~24.89%;采用桩体对地基进行加固,并在路基底部采用土工格栅+碎石处理后,路堤的整体安全系数由天然地基时的1.58提高至1.75。Taking the sandy soil embankment structure of k29+633.5 section of Puwei highway as background,the three-dimensional numerical analysis model of pile sand bearing embankment reinforced by cement soil mixing pile is established.The stability of pile sand bearing embankment and the working properties of pile composite foundation,such as load transmission law,vertical and horizontal displacement,are discussed.The results show that:When the natural embankment slope reaches the critical state,the potential sliding surface shows the trend of extending from the slope toe to the embankment surface.Although it is not completely connected,in order to meet the requirements of post construction settlement,foundation reinforcement treatment is needed;After strengthening the soft foundation under the embankment,the overall deformation of the embankment is greatly reduced.Compared with the natural foundation,the maximum vertical settlement of the embankment decreases by about 16.10%~24.89%in each construction stage;after the soft foundation is reinforced with piles and treated with geogrid and gravel at the bottom of the subgrade,the overall safety factor of the embankment is increased from 1.58 to 1.75.

关 键 词：砂性土 桩体复合路基 数值分析 稳定性 加固效果 

分 类 号：TU473.11[建筑科学—结构工程]