地震CT结合地震映像法综合物探应用研究

Study on Application of Comprehensive Geophysical Exploration Combining Seismic Tomography with Seismic Imaging Method

研究目的:在铁路勘察过程中,经常遇到诸如采空区等地质隐患。对于这类不规则的地质隐患,物探勘探是一种有效的勘探方法。本文以地震映像法和地震CT法综合应用为例,为充分发挥两种物探方法的优点并互相补充,在测区先开展地震映像法以快速确定采空区的粗略空间展布,再依据地震映像成果布置钻孔,开展地震CT工作,精细探查采空的空间展布。结合工程实例,探讨方法的有效性。研究结论:(1)地震映像法和地震CT法各有优缺点:地震映像法能够高效快捷地确定采空区的平面位置,深度范围误差较大;地震C T分辨率高、可靠性好、图像直观、但需要借助钻探孔才能开展;(2)充分发挥两种物探方法的优点,能够有的放矢,在减少钻孔数量的同时,提高勘探的精度;(3)将两种物探方法综合应用在采空区勘探中是合理的、可行的,对类似的物探工作具有一定的指导意义。

Research purposes： In the railway survey process, we often encounter problems such as goaf and other geological hazards. For this type of irregular geological hazards, the geophysical exploration is an effective method. This paper makes the seismic imaging method and seismic tomography method integrated applications as an example. In order to give full play to the advantages of the two geophysical methods and complement each other, it first develops the test of seismic imaging method to fix a rough spatial distribution in goaf quickly; then, based on the seismic imaging results, it arranges to drill holes to carry out the seismic tomography work, in order to explore the spatial distribution in goal subtly. It dicussed the effectiveness of the two methods with engineering examples. Research conclusions： （1）Seismic imaging method and seismic tomography method both have advantages and disadvantages ： seismic imaging method could fix the goal plane position efficiently and swiftly, but the depth range error is larger; seismic tomography holds the features of high resolution, great reliability, and visual pictures, but it need the help of drilling to carry out. （2） Giving full play to the merits of the two geophysical methods can reduce the drilling holes number and improve the exploration accuracy. （3）Comprehensive application of the two geophysical methods in exploration of goal is reasonable and feasible, it has guiding significance for similar geophysical work.