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目前许多高速公路隧道双洞间距处于规范所要求的小净距隧道与分离式隧道区分临界值附近,此工况下隧道中隔墩及相邻隧道衬砌在爆破振动下的稳定性需通过测试数据进行分析。结合竹山隧道爆破振动测试,得出各个方向上的振动速度绝对值,评定爆破振动对中隔墩及相邻洞二次衬砌的稳定性影响。再根据测试数据回归分析得出该区域的爆破地震波传播规律的代表公式,并推算出单段最大安全用药量,修正此隧道今后开挖的爆破参数。该结果可为类似工况下的隧道爆破开挖提供参考依据。
At present, the spacing between two tunnels in many freeway tunnels is close to the critical value between the small clear tunnel and the separate tunnel required by the regulation. Under such conditions, the stability of the tunnel pier and adjacent tunnel lining under blasting vibration needs to pass the test data Analyze. Combined with the blasting vibration test of the Zhushan Tunnel, the absolute value of the vibration velocity in each direction is obtained, and the influence of blasting vibration on the stability of the secondary lining of the diaphragm pier and the adjacent tunnel is evaluated. According to the regression analysis of the test data, the representative formula of the blasting seismic wave propagation in this area is obtained. The maximum safe dosage of the single section is deduced, and the blasting parameters of the future tunnel excavation are corrected. The results can provide reference for tunnel blasting under similar conditions.