【摘要】 当城市地铁采用钻爆法施工时,隧道爆破施工产生的爆破地震波将对邻近埋地管道产生不利的影响,加大施工难度和风险。文中以大连市地铁一号线为工程背景,采用现场实测和数值模拟相结合的研究手段,对钻爆法施工过程中爆破地震波在岩土体内的衰减规律及埋地管道的爆破振动响应进行了研究。结果表明:管道和地表沉降时程曲线大致呈指数分布,两者趋势一致。管道沉降监测点的直接监测值和间接监测值呈一定的比例关系,且前者大于后者。数值模拟得到的爆破地震波衰减规律与实测结果基本一致,说明地铁隧道采用钻爆法施工时,借助数值模拟研究爆破振动效应是可行的。依据现场实测数据,建立了能够反映地铁隧道采用钻爆法开挖时爆破地震波的传播规律的质点萨道夫斯基预测公式,在后续隧道采用钻爆法施工时,可以参考萨道夫斯基公式并结合现场实测数据来不断的调整和完善爆破参数,从而指导地铁隧道后续阶段的施工。更多还原

【Abstract】 When construction of the drilling and blasting method,blasting excavation produced ground motion will adversely affect neighboring already buried pipelines. These will increase the difficulty and risk of the subway construction. Taking the drilling and blasting construction of Qianshan Road Station to Songjiang Road Station interval tunnel in Dalian Metro Line 1 as the engineering background,the attenuation law of blasting seismic wave and the blasting vibration response of buried pipeline are studied by means of field monitoring and numerical simulation. The results show that the settlement curve of the pipeline is in an exponential distribution,which is consistent with the trend of land subsidence. The comparisons show that the numerical simulation of the blasting seismic wave attenuation with distance from the explosion center in agreement with measured results. This indicates that the study of the blasting vibration effect of blasting excavation by using numerical simulation method is feasible. According to the blasting monitoring data,the prediction formula for blasting seismic wave propagation characteristics of Dalian subway tunnel was established by regression analysis method. Combined with the blasting monitoring data and the prediction formula to continue to improve and adjust the blasting parameters,so as to guide the subsequent phases of drilling and blasting construction of subway tunnel.更多还原