九华山隧道开挖爆破对古城墙影响的计算分析

计算分析了南京九华山隧道工程开挖爆破对明古城墙的影响。在对国内外流行的安全标准进行比较的基础上,指出了采用频率与震速结合的爆破震动安全标准的必要性,且采用德国爆破震动安全标准作为计算九华山隧道开挖爆破对古城墙的影响的判据;分别利用目前流行的震动速度和震动频率公式进行计算,判断开挖爆破对古城墙的影响程度及影响范围。结果表明,爆破震动对古城墙安全构成威胁,并计算得出开挖爆破最小安全距离。

Calculation and Analysis on Influence of Blasting in Jiuhuashan Tunnel Excavation on Ancient City Wall

Combining with JiuhuashanTunnel Project, influence of blasting in tunnel excavation on ancient wall is calculated and analyzed. There is a section of acient wall on half way up Jiuhuashan Mountain, which the tunnel passes through. The wall has a history of more than six hundred years, and is necessary to protect carefully. Based on analyzing popular safety criteria, such as Blasting Safety Regulations, OSM blasting vibration safety criterion, Germany blasting vibration safety criterion, Switzerland blasting vibration safety criterion. The safety criteria of considering vibration velocity and vibration frequency have been adopted in many countries. The necessity of adopting the safety criteria of considering vibration velocity and vibration frequency is pointed out in the paper. Germany blasting vibration safety criterion is adopted to estimate the safety of the ancient city wall under the influence of blasting in tunnel excavation, applying several popular vibration velocity and vibration frequency formulas to calculate the extent and range of the influence of blasting in tunnel excavation on ancient city wall.