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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。
Combined with the expansion project of the Tai-mo-shan tunnel in Quan-hai section of Shenyang-Hohai Expressway, the vibration response of the rock mass under the influence of blasting vibration is monitored and the influence of the vibration wave in surrounding rocks at different levels and locations is analyzed Propagate the law. The results show that the vibration velocity of the rock mass in the middle of the tunnel increases with the improvement of the surrounding rock mass, and the difference decreases gradually. The vibration velocity of the arch waist and the arch shoulder area is greater than that of the arch foot. The maximum vibration velocity appears at the measuring point When the clearance of the tunnel is about 6m, the influence scope of blasting vibration on the middle pillar is 10 ~ 20m before and after the blasting face. With the improvement of the surrounding rock quality, the influence range will be reduced correspondingly. At the same time, the general control of blasting general medicine Volume and the maximum single-dose, and sub-blasting, blasting time difference should not be less than 75ms.