小排列地震散射扫描技术在地铁隧道上方土体空洞探测中的应用

摘要

介绍了小排列地震散射扫描技术的基本原理、探测方法及数据分析方法。应用散射偏移数据处理方法，获取介质弹性波波场的初至、波速、振幅、频率等参数，通过散射偏移成像，得到介质内部的结构、构造等的分布图像。以实际地铁隧道上方土体空洞探测为例，对该方法工作中的规律及效果进行总结，提高浅层异常空洞探测的准确性，提高了分辨率，解决了雷达等方法探测深度不足的问题，在城市地铁沿线探测中有较好的应用效果。%In this paper, a series introduction of scattering and scanning technology with short array has been put forward, including basic theory, prospecting methods and data analyzing approach. Using this technology to get such parameters of e⁃lastic wave field as first break, velocity, amplitude and frequency, which makes a significant difference to invert geological structures underground by migration imaging with scattering. Then it summarizes the principles and results of actual appli⁃cation in detecting cavities above subway tunnel, in the light of improving accuracy and precision of this technology, which has such advantages as strong interference resistance, high resolution and deep exploration depth, is suitable for exploring disturbed zones and estimating effect in urban subway.