卵石土地区双排桩基坑支护力学特性分析  

Mechanical Characteristics Analysis of Double-row Pile Foundation Pit Support in Pebble Soil Area

作　　者：李永奎 唐科行 谭钢 LI Yongkui;TANG Kehang;TAN Gang(Chengdu Survey,Design and Research Institute Co.,Ltd.of CREEC,Chengdu 610081,China)

机构地区：[1]中铁二院成都勘察设计研究院有限责任公司,成都610081

出　　处：《路基工程》2022年第4期123-126,共4页Subgrade Engineering

摘　　要：以某卵石土地区的双排桩基坑支护工程为例,以距基坑7.8 m的4种不同既有建筑地下室埋深为控制变量,运用有限元软件,研究分析新建12.0 m基坑双排桩支护结构的水平应力变化规律。结果发现:地下室埋深从0 m变化至9.0 m时,水平应力随着埋深的增加而不断减小,表明基坑设计时可考虑地下室对主动土压力的遮拦效应,可适当对主动土压力进行折减。Taking a double-row pile foundation pit support project in a pebble soil area as an example,with the burial depth of four different existing building basements at a distance of 7.8 m from the foundation pit as the control variable,the horizontal stress variation law of newly-built 12.0 m foundation pit double-row pile supporting structure is studied and analyzed by finite element software.The result found that when the burial depth of the basement changed from 0 to 9.0 m,the horizontal stress decreased continuously with the increase of the burial depth.It shows that the shielding effect of basement on active earth pressure can be considered in the design of foundation pit,i.e.,active earth pressure can be appropriately reduced.

关 键 词：卵石土 双排桩 既有建筑物 埋深 遮拦效应 

分 类 号：TU473.1[建筑科学—结构工程]