双隧道开挖对浅基础建筑物沉降影响的研究  

Influences of twin-tunnel excavation on settlement of shallow foundation buildings

作　　者：李建东 元光宗 边天奇 赵跃 安晓宇 LI Jiandong;YUAN Guangzong;BIAN Tianqi;ZHAO Yue;AN Xiaoyu(Tianjin Research Institute for Water Transport Engineering,MOT,Tianjin 300456,China;School of Civil Engineering,Tianjin University,Tianjin 450001,China)

机构地区：[1]交通运输部天津水运工程科学研究院,天津300456 [2]天津大学建筑工程学院,天津450001

出　　处：《岩土工程学报》2024年第S01期147-151,共5页Chinese Journal of Geotechnical Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(TKS20240401)。

摘　　要：基于离心模型试验和数值模拟计算,对两条平行开挖的跨江隧道引起的上部浅基础建筑物和地表沉降规律进行了研究。结果表明:浅基础建筑物不同监测点位的沉降量均随土体体积损失率的增大而增大。随着土体体积损失率的增加,上部浅基础建筑物的不均匀沉降增加,隧道上方的土体的竖向位移逐渐增大,沉降槽的范围逐渐增大。本项目中隧道间距为1倍洞径条件下,左右隧道开挖顺序的改变会对上部建筑物沉降量和地面最大沉降量影响较小,但先开挖隧道拱顶处的地面沉降要大于后开挖隧道拱顶处的地面沉降。Based on the centrifugal model tests and numerical calculations,the settlement laws of the upper shallow foundation buildings and ground caused by twin tunnel excavation are studied.The results show that the settlements of different monitoring points in the shallow foundation buildings increase with the increase of soil loss rate.As the soil loss rate increases,the uneven settlements of the upper shallow foundation buildings increase,the vertical displacements of the soil above the tunnel gradually increase,and the range of the settlement trough gradually increases.Under the tunnel spacing of 1D in this project,changes in the excavation sequence of the two tunnels have a relatively small impact on the settlements of the upper buildings and the maximum ground settlement.However,the ground settlements at the tunnel vault excavated first is greater than those at the tunnel vault excavated later.

关 键 词：双隧道开挖 浅基础建筑物 地表沉降 体积损失率 开挖顺序 

分 类 号：TU411[建筑科学—岩土工程]