摘要
孤石对于地下工程施工影响较大,采用地震波跨孔层析成像(CT)技术,精确探测出地下孤石的形态及分布情况可为施工方案提供科学依据、节约施工成本。通过对比分析层析成像中两种射线追踪法应用于孤石探测效果,进而提高孤石探测的精度。论文首先论述了两种射线追踪方法原理的异同点,当地下介质波速差异较大时,弯曲射线追踪更符合真实射线传播路径;再以实例验证说明,当地下介质均匀时,两种射线追踪法反演结果基本一致,当地下存在与周围介质波速差异较大的孤石时,采用弯曲射线追踪法反演结果具有更高的分辨率和精确度。
Underground boulders have larger impact on underground construction. Seismic cross-hole tomography method can be used to detect precisely the form and distribution of underground boulders, which can provide scientific proof for construction plan and save construction costs. Through comparison and analysis of the application effect of two straight ray tracing methods in boulders, the accuracy of boulder detection can be effective- ly improved. The different principles of two ray tracing methods are firstly discussed in this paper. When the medium velocity has large differences, curved ray tracing method is more in line with real ray propagation path. Then it can be verified by an engineering example. When detected homogeneous medium, two kinds of ray tracing methods＇ inversion results are similar. When underground existed boulders, whose velocity has large differences with the surrounding medium, the inversion results of curve ray tracing method have higher res- olution and accuracy.
出处
《工程地球物理学报》
2015年第3期361-366,共6页
Chinese Journal of Engineering Geophysics
基金
福建省广义地质工作项目(编号:20141203)资助
关键词
孤石
层析成像
直线追踪
曲线追踪
boulder
tomography
straight ray tracing
bending ray tracing
