紧邻基坑的地铁隧道跟踪注浆保护模型试验  

Model Test on Tracking Grouting Protection of Subway Tunnel Adjacent to Foundation Pit

作　　者：陆幸 郑明飞 刘干斌 叶俊能 郦亮 Lu Xin;Zheng Mingfei;Liu Ganbin;Ye Junneng;Li Liang(Ningbo Rail Transit Group Co.,Ltd.,Ningbo,Zhejing 315010,P.R.China;Institution of Geotechnical Engineering,Ningbo University,Ningbo,Zhejing 315211,P.R.China)

机构地区：[1]宁波市轨道交通集团有限公司,浙江宁波315010 [2]宁波大学岩土工程研究所,浙江宁波315211

出　　处：《地下空间与工程学报》2021年第6期1839-1846,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51778303);宁波市科技计划项目(2019C50013)。

摘　　要：以宁波轨道交通3号线陈姜区间隧道为依托,开展了紧邻基坑的地铁隧道跟踪注浆保护模型试验研究,测试了隧道的位移、隧道外侧土压力与孔隙水压力、地连墙压力和位移及地表位移等,分析了注浆在土体内部的流动机理及对隧道位移的影响机理,结果表明:注浆后隧道位移有一定幅度的减缓,注浆停止后位移继续增大;土体中孔压、土压力增量较小,约为注浆压力的1/70~1/50,且注浆压力受土体阻力作用后快速衰减;注浆距墙体较近时,地连墙压力、水平位移显著增大,对基坑稳定不利;跟踪注浆的劈裂面平行于地连墙长度方向,浆液沿着土体应力最弱面,即小主应力面垂直方向进行劈裂。Based on the Chen-Jiang interval tunnel of Ningbo Rail Transit Line 3,this paper carried out a test study on the tracking grouting protection model of the subway tunnel adjacent to the foundation pit,and tested the displacement of the tunnel,the earth pressure on the outside of the tunnel and the pore water pressure,and the ground wall.The flow mechanism of grouting in the soil and the influence mechanism on the displacement of the tunnel were analyzed.The results show that the displacement of the tunnel is slowed down after grouting,and the displacement continues to increase after grouting stops.The pore pressure and earth pressure increment in the soil are small,occupying about 1/70~1/50 of the value of grouting pressure,and the grouting pressure is rapidly attenuated by the resistance of the soil.When the grouting is closer to the wall,the pressure and horizontal displacement of the grounding wall are significantly increased,which is unfavorable to the stability of the foundation pit.The cracking surface of the grouting is parallel to the length of the grounding wall,and the slurry is always the most stress along the soil.The weak surface,that is,the small principal stress surface is split in the vertical direction.

关 键 词：基坑 地铁隧道 跟踪注浆 模型试验 流动机理 

分 类 号：TU472[建筑科学—结构工程]