2020·3·Building Construction 454
新建隧道爆破施工对既有轨道交通区间
隧道的动力影响分析
李青松 田志龙 王长寿 许 珂 谢佳桓
中建八局第二建设有限公司 山东 济南 250014
摘要: 为研究新建隧道爆破施工对既有轨道交通区间隧道的动力影响,以重庆轨道交通9号线一期工程观音桥站施工通
道为例,采用有限元数值分析法建立爆破模型,模拟既有的重庆轨道交通3号线区间隧道在爆破荷载作用下引起的振
动速度及岩土应力分布情况。结果表明:新建施工通道爆破开挖引起既有区间隧道结构的振速最大值为1.38 cm/s,控
制在1.50 cm/s以下;同时,对等效应力云图的分析可以看出,模拟爆破产生的应力较小。可见新建隧道爆破施工对既
有轨道交通区间隧道的动力影响较小,风险可控,建议施工过程中加强对既有轨道交通区间隧道迎爆侧及拱顶位置的
监测。
关键词: 新建隧道; 爆破开挖;既有轨道交通区间隧道;动力影响
中图分类号: T U 998 文献标志码: A 文章编号: 1 004-1 001(2 020)0 3-0 454-0 4 DOI: 1 0.1 4144/j. c nki. jz sg .2 020.0 3.0 52
Analysis of Dynamic Influence of Blasting Construction of New Tunnel on
Existing Rail Transit Interval Tunnel
LI Qingsong TIAN Zhilong WANG Changshou XU Ke XIE Jiahuan
The Second Construction Limited Company of China Construction Eighth Engineering Division, Ji'nan, Shandong 250014, China
Abstract: To s tu d y th e d yn am ic in flu ence o f b la stin g c onstr u ctio n o f n ew tu nnel o n e xis tin g ra il tr a nsit in te rv a l tu nnel,
ta kin g th e c onstr u ctio n c hannel o f G uanyin q ia o S ta tio n o f th e fir s t p hase p ro je ct o f C hong qin g R ail T ra nsit L in e 9 a s a n
exa m ple , th e b la stin g m od el is e sta b lis h ed u sin g th e fin it e e le m ent n um eric al a naly sis m eth od to s im ula te th e v ib ra tio n
sp eed a nd th e d is tr ib utio n o f g eote chnic al s tr e ss c ause d b y th e b la stin g lo ad o f th e e xis tin g tu nnel o f C hong qin g R ail
T ra nsit L in e 3 . T he re su lt s s h ow s th at, th e m axim um v ib ra tio n v e lo cit y o f th e e xis tin g tu nnel s tr u ctu re c ause d b y th e
b la stin g e xc ava tio n o f th e n ew c onstr u ctio n c hannel is 1 .3 8 c m /s , w hic h is c ontr o lle d b elo w 1 .5 0 c m /s ; a t th e s a m e tim e,
it c an b e fo und fr o m th e a naly sis o f e q uiv a le nt e ffe ct fo rc e c onto urs th at th e s tr e ss p ro d uced b y th e s im ula te d b la stin g
is s m all. It in d ic ate s th at th e b la stin g c onstr u ctio n o f th e n ew tu nnel h as lit tle in flu ence o n th e d yn am ic o f th e e xis tin g r a il
t r a nsit in te rv a l tu nnel, a nd th e r is k is c ontr o lla b le . It is s u g geste d to s tr e ng th en th e m onit o rin g o f th e b la stin g s id e a nd th e
va ult p osit io n o f th e e xis tin g r a il tr a nsit in te rv a l tu nnel in th e c onstr u ctio n p ro cess.
Keywords: new tunnel; blasting excavation; existing rail transit interval tunnel; dynamic
新建隧道爆破施工对既有轨道交通区间隧道的动力影响分析(论文).pdf