大跨度小净距隧道爆破振动监测与分析
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摘要
结合沈海高速公路泉厦段大帽山隧道扩建工程,对大跨度小净距隧道中间岩柱在爆破振动作用下的振动响应进行相关监测,分析振动波在不同级别、不同位置围岩中的传播规律。研究结果表明,隧道中间岩柱振动速度随着围岩质量提高,差别逐渐减小,且拱腰及拱肩部位振动速度大于拱脚部位;最大振动速度出现在迎爆侧边墙测点的径向方向;当隧道净距为6m左右时,爆破振动对中间岩柱的影响范围为爆破面前后10~20m,且随围岩质量提高,影响范围相应减小;同时,宜严格控制爆破总药量和单段最大药量,且分段爆破时,爆破段时差应不小于75ms。
Based on the construction of Damaoshan Tunnel with small clear space on Shenyang to Haikou Expressway,the monitoring of blasting vibration has been carried out,and spreading regulations of vibration wave in different class and difference locations surrounding rocks are anaylzed.The results show that the vibration speed at tunnel wall is greater than that at the foot of the wall,and the better the rock mass quality the less differences the vibration speeds at the two places are.The maximum vibration speed occurs at the radial direction of tunnel wall facing the blasting side;when the clear distance of two tunnels is about 6m,the disturbance range of blasting vibration to inter-space rock is 10~20mapart from the blasting working face.The better the quality of rock mass is,the less the disturbance range is.In addition,the total explosive volume should be strictly controlled and decreased,as well as the single segment,and the blasting segments interval time should be greater than 75 ms.The experience and conclusions presented can be referred in the blasting controlling and site monitoring of similar tunnels.
引文
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