摘要
为了探测在建高铁隧道强干扰环境影响下隐伏岩溶空间分布,采用地震映像时-频综合分析技术进行隧底隐伏岩溶探测。先利用地震映像法获取隧底地质体的时间域信号,基于魏格纳-威尔分布算法将其转化至频率域,再通过获取的时-频信息综合判定隐伏岩溶发育区,并确定其空间分布。将该研究成果应用于贵州某在建高铁中,多个隧道岩溶探测结果表明,在时间域中岩溶区地震反射波走时相比同相位高出5 ms,同时在频率域中岩溶区频率降低至240 Hz以下,由时间-频率域共同圈定物探异常区,在此异常区的验证钻孔均发现岩溶。研究结果表明,该方法在强干扰隧道隐伏岩溶中取得较好的探测效果,可为隧底隐伏岩溶精细、快速探测提供新的思路。
In order to detect the spatial distribution of hidden karst under the influence of strong interference environment in the under-construction high-speed railway tunnels,the seismic image time-frequency integrated analysis technique was adopted to detect the hidden karst at the bottom of the tunnels.The seismic image method was used to acquire the time-domain signals of the geologic body under the tunnel,which were converted to the frequency domain based on the Wegener-Weil distribution algorithm,and then the time-frequency information was used to determine the development area of latent karst and its spatial distribution.The research results are applied to a high-speed railway under construction in Guizhou,and the karst detection results in several tunnels show that the seismic reflection wave travel time in the time domain is 5ms higher than that of the same phase,and at the same time,the frequency of karst area in the frequency domain is reduced to less than 240 Hz,and the time-frequency domain jointly circles the anomalous area of physical prospecting,and karsts are found in all the verification boreholes of the anomalous area.The results show that the method achieves good detection effect in the hidden karst of strong interference tunnel,which can provide a new idea for the fine and fast detection method of hidden karst at the bottom of the tunnel.
作者
李伟
唐宇豪
罗威
赵思为
邓勇
张家坤
LI Wei;TANG Yuhao;LUO Wei;ZHAO Siwei;DENG Yong;ZHANG Jiakun(China Railway Eryuan Engineering Group.Co.,Ltd.,Chengdu 610031,China)
出处
《铁道勘察》
2024年第2期45-49,共5页
Railway Investigation and Surveying
关键词
高速铁路
隧底隐伏岩溶
地震映像法
魏格纳-威尔分布算法
时-频综合分析
high-speed railway
hidden karst at the bottom of tunnel
seismic image method
Wigner-Wille distribution method
time-frequency integrated analysis
