超近距离爆破振动下铁路隧道铁轨振动特性研究

依托实际铁路隧道工程,结合铁轨爆破振动测试与能量分析,对超近距离邻近隧道爆破施工影响下既有铁路隧道铁轨爆破振动效应及其控制进行研究。利用小波包分解及其保范性在Matlab里对爆破振动信号进行分解,并计算出铁轨爆破振动不同频带能量分布情况,得到不同频率带所占能量百分比,并拟合出能量衰减公式以更进一步量化铁轨地震波能量变化规律。通过对监测数据进行拟合得到适合琅口隧道场地条件的萨道夫斯基公式,分析超近距离下铁路隧道铁轨的爆破地震波的衰减规律,得出琅口隧道场地条件下的安全药量、距离计算公式。

Research on Rail Vibration Characteristics of Railway Tunnel Under Ultra-Close Blasting Vibration

Based on the actual railway tunnel engineering, combined with the test and energy analysis of rail blasting vibration, a research has been conducted on the blasting vibration effect and its control of existing railway tunnel under the influence of blasting construction of ultra-close adjacent tunnels. Wavelet packet decomposition and its norm preservation in Matlab have been used to decompose the blasting vibration signal, thus working out the track of blasting vibration in different frequency band energy distribution, obtaining the energy percentages of different frequency bands, and fitting the energy attenuation formula to further quantify the wave energy variation of iron rail. By fitting the monitoring data, the Sudowski formula suitable for the site conditions of Langkou Tunnel can be obtained. An analysis has been made of the attenuation law of blasting seismic wave of railway track under ultra-close distance, thus obtaining the formula for the calculation of the safe charge quantity and distance under the condition of Langkou tunnel site.