摘要
结合南山下隧洞下穿温福客运专线钱仓山隧道工程,实时监测近距离交叉隧洞爆破施工对既有隧道的振动影响。实测结果表明,(1)迎爆面位置影响既有隧道断面的爆破振动速度分布;震源距离测点大于30m时,距离是爆破振动的主要影响因素;震源距离测点小于30m时,主要影响因素则为装药量与距离。(2)岩体越坚硬完整,爆破振动波传播衰减越慢。采用导洞先行预留光面爆破、导洞爆破掏槽眼和周边眼及底板眼分开起爆、控制最大段装药量等措施,可有效地降低爆破振动影响,控制其对钱仓山隧道的影响,对类似工程有借鉴作用。
Based on the engineering that Nanshanxia Tunnel down-traversing Qiancangshan Tunnel of Wen-Fu Passenger Dedicated Line,the vibration effects on the existing tunnel caused by blasting of an adjacent cross tunnel have been monitored.The results of the tests show that: the position of blasting surface affects velocity distribution of the cross-section of existing tunnel;when the distance between vibration source and measuring points is more than 30 m,the main influence factor of vibration is distance;while it is less than 30 m,the main factors are the amount of dynamite and distance;the harder and more complete the rock is,the slower the attenuation of the propagation of blasting vibration wave is.Measures such as pilot tunnel blasting in advance of smooth blasting;pilot tunnel blasting that the initiation of cutting holes,periphery holes and bottom holes are separated;and controlling maximum explosive volume for single segment can weaken the impact of blasting vibration effectively and control the vibration effects on Qiancangshan Tunnel;it can be a reference for similar projects.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第2期537-541,共5页
Rock and Soil Mechanics
关键词
铁路隧道
交叉隧道
爆破振动
振动速度
监测
railway tunnel
cross tunnel
blasting vibration
vibration velocity
monitoring