【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。更多还原

【Abstract】 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.更多还原