城市大跨度隧道爆破对地面建筑物影响的研究

以嘉华隧道工程开挖为研究对象,应用安全系统工程中的事故树法对爆破振动影响区域内的地面建筑物进行定性分析,找出影响地面建筑物稳定的最小割集;求出各基本事件的结构重要度,为后续监测和施工方案的调整提供理论依据。结合现场实际情况,制定合理的爆破地震波的振动监测方案。同时,对爆破振动监测结果的回归分析,确立振动传播衰减规律。分别从振动速度和峰值频率两个方面对地面建筑物的安全性进行评价。笔者研究成果对指导隧道工程开挖爆破施工和保证地面建筑物安全有重要指导作用。

Study on the Influence of Urban Large-span Tunnel Blasting on Ground Buildings

Based on the excavation of Jiahua tunnel project,the damage status of the ground buildings in the blast vibration area was qualitatively analyzed by using the method of fault tree analysis in safety system engineering,and the minimal cut sets affecting stability of the ground buildings were found out.The structure importance of each basic event was calculated,which provided theoretical basis for the following monitoring and the adjustment of construction plan.According to the actual condition on the site,the reasonable vibration monitoring plan for blasting seismic wave was established.Meanwhile,the attenuation laws of explosion vibration propagation were put forward by use of regression analysis on the monitoring results of blasting vibration.Finally,safety assessment was made on the ground buildings from vibration velocity and peak frequency.This study plays an important role in guiding the excavation blasting construction of the tunnel project and assuring the safety of ground buildings.