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地震波层析成像借鉴了医学上X射线断面扫描的基本原理,利用地震波穿过地质体后走时及能量的改变等物理信息,通过数学处理重建地质体内部图像,从而得到所研究地质体的岩性及构造分布。本文利用这种方法,在一个钻孔中利用电火花震源激了弹性波,在另一个钻孔布设多个检波点同时接收,拾取弹性波初至时间,将接收到的数据利用SIRT方法进行反演迭代计算,最终形成一个弹性波速度谱图,然后利用岩土体的弹性波速度差异推断岩体完整性分布。与其它测试方法比较,该方法分辨率高,空间位置准确,在工程物探、岩土工程勘察中具有较好的应用前景。
Based on the basic principles of medical X-ray section scanning, seismic tomography uses the physical information such as travel time and energy change of seismic waves passing through the geological body to reconstruct the internal images of the geological body by mathematical processing to obtain the lithology of the geological body under study And structure distribution. In this paper, we use a spark source to excite elastic waves in one borehole and receive a plurality of detection points in the other borehole at the same time, pick up the first arrival time of the elastic wave, and use the SIRT method to carry out the received data As a result of iterative calculation, an elastic wave velocity spectrum is finally formed, and then the integrity distribution of rock mass is deduced by utilizing the difference of the elastic wave velocity of the rock mass. Compared with other testing methods, this method has high resolution and accurate spatial location, and has good application prospect in geophysical prospecting and geotechnical investigation.