下穿铁路隧道爆破振动分析及控制方法研究

为了系统研究下穿铁路隧道的爆破振动响应规律及安全控制方法,通过现场实测及数值模拟方法展开分析。首先,根据实测结果得到可以反映爆破振动速度分布特征的回归模型,并基于此得出隧道爆破施工允许的最大单响药量值;其次,采用FLAC^3D平台建立三维数值模型,通过现场实验结果对模型的可靠性进行校核;根据数值模拟结果,得到适用于下穿隧道控制爆破施工的安全距离的建议值。研究结果表明:隧道空洞效应对爆破振动传播规律存在一定影响,研究结果可为类似的下穿隧道爆破施工提供1种新的控制方法及控制思路。

Study on blasting vibration analysis and control method of undercrossing railway tunnel

In order to systematically study the blasting vibration response law and safety control method of the undercrossing railway tunnel,the analysis was carried out by means of field measurement and numerical simulation.Firstly,according to the measured results,a regression model reflecting the distribution characteristics of blasting vibration velocity was obtained,and the maximum allowable single-shot charge value for the tunnel blasting construction was obtained on this basis.Secondly,a three-dimensional numerical model was established based on the FLAC3D platform,and the reliability of the model was checked through the results of field experiments.Finally,according to the numerical simulation results,the suggested value of safety distance suitable for the controlled blasting construction of the undercrossing tunnel was obtained.The results showed that the tunnel cavity effect had certain influence on the propagation law of blasting vibration.The research can provide a new control method and control idea for the blasting construction of similar undercrossing tunnels.