摘要
关于硬岩地层中既有隧道喷锚初支受邻近隧道施工影响产生的变形控制标准的研究很少,依托青岛地铁4号线人民会堂站斜井上跨3号线人汇区间工程为背景,采用MIDAS/GTS计算分析斜井施工对既有运营隧道的影响,并结合自动化监测实测数据进行研究,得到以下结论:①采用超前小导坑非爆破+后续爆破扩挖减振爆破方案,产生的爆破振动速度满足爆破控制标准0.5cm/s;②硬岩地层初支结构变形控制标准建议为:竖向及水平收敛≤3mm,爆破振速≤0.5cm/s;③硬岩地层隧道施工的主要影响区≤0.5H,次要影响区为(0.5~0.8)H。
In order to fill in blank in effect on initial lining tunnel in rock strata associated with the excavation of adjacent shaft,we choosing Qingdao metro line 4 Renmin Huitang station’s inclined shaft which overcross the existing initial lining tunnel of metro line 3 as background,adopting automatic monitoring,using MIDAS/GTS to simulate the effect of existing tunnel’s bolt&shotcrete lining caused by inclined shaft excavation.The FEA and monitoring results indicate that:(1) the speed of blast vibration is controlled into 0.5 cm/s with the advanced non-blasting heading and subsequent blasting excavation (2) the deformation standard of bolt & shotcrete lining tunnel in rock strata is recommended as follows:the vertical&horizontal displacement≤3 mm,the speed of blast vibration≤0.5 cm/s (3) the primary influence area of tunnel excavation in rock strata may be adjust to 0~0.5 H,the secondary influence area may be adjust to 0.5~0.8 H.
作者
孟小伟
夏靖
周锦强
张椿民
MENG Xiaowei;XIA Jing;ZHOU Jinqiang;ZHANG Chunmin(Kunming Survey,Design and Research Institute Co.,Ltd.,of Creec 650200, China)
出处
《结构工程师》
北大核心
2019年第4期48-54,共7页
Structural Engineers
