浅埋隧道掏槽爆破地表质点震速规律研究

On the Velocity Law of Ground Particle Vibration Induced by Cut Blasting in a Shallow-Buried Tunnel

文章以青岛地铁一期工程（3号线）土建03标太延区间下穿济军一疗口腔医院为工程背景，研究了浅埋隧道爆破地表质点震动速度规律。在平行隧道轴向正上方，监测掏槽爆破时垂直方向、水平径向和水平切向3个方向产生的震动速度第1段的最大值；在垂直隧道轴向上，监测掏槽爆破时垂直方向产生的震动速度第1段的最大值。结合地下爆破施工对地面震动影响的监测数据．研究发现，掏槽爆破震动峰值出现在距工作面前方1～3m的范围内．在基准点附近存在一个火山口状的震动峰谷；合成震动速度在数值上比单一方向的震速存在放大现象，但合成的震动曲线规律与单一方向震动规律相似。

Based on the construction of lot 3 of the Qingdao Metro Line 3, which passes under a dental hospital, this paper researches the velocity law of ground particle vibration induced by cut blasting in a shallow-buried tunnel. To be specific, it monitors the maximum vibration velocities in the vertical, horizontal radial, and horizontal tangential directions at the first monitoring section from right above the parallel tunnel axis, as well as the maximum velocity in the vertical direction from the vertical tunnel axis. In light of the effects of underground blasting on ground vibration, it is determined that the vibration peak value occurs at a distance of 1-3m from the working face, while a crater-shaped peak and valley value occur near the reference point due to cut blasting, and the synthetic vibration velocity is greater than the velocity in any single direction, but their vibration laws are similar.