软土层中控沉桩对管廊地基沉降的影响  

RESEARCH ON THE INFLUENCE OF PILE-SINKING CONTROL ON THE MEDIUM COMPRESSIBLE SOIL FOUNDATION SETTLEMENT OF UTILITY TUNNELS

作　　者：胡潇帆 HU Xiaofan(Shanghai Municipal Engineering Design Institute(Group),Shanghai 200092,China)

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《低温建筑技术》2024年第1期132-136,共5页Low Temperature Architecture Technology

摘　　要：城市管廊在建设中经常会遇到不良地质,不良地基不可避免地会引起已建成的地下综合管廊的沉降变形导致综合管廊的开裂、渗漏,影响管廊正常使用。文中以中压缩性土层上的某三舱管廊为例,通过Plaxis 2D有限元软件对有无控沉桩两种工况进行数值模拟,分析桩长、桩径和桩间距对沉降的影响。结果表明相比于无桩工况,控沉桩能显著降低管廊地基沉降量,且能避免地基出现不均匀沉降和土体发生剪切破坏等问题。桩长、桩径和桩间距对管廊地基沉降均有不同程度的影响。Urban utility tunnels often encounter adverse geological conditions during the construction.Adverse foun⁃dations inevitably lead to settlement and deformation of the existing underground utility tunnels with cracks and leak⁃age,which affects the normal use of the tunnels.Taking a three-compartment utility tunnel on a medium-pressure compressible soil layer as the case,numerical simulations are conducted for two working conditions including with and without controlled settlement piles by using Plaxis 2D finite element software.The influence of pile length,diam⁃eter,and spacing on settlement is analyzed.The results show that controlled settlement piles significantly reduce the settlement of the tunnel foundation and prevent uneven settlement and shear failure of the soil comparing to the con⁃dition without piles.Pile length,diameter,and spacing all have varying degrees of impact on the settlement of the tunnel foundation.

关 键 词：地基沉降 控沉桩 中压缩性土 

分 类 号：TU433[建筑科学—岩土工程]