跨孔地震波CT层析成像技术在海域岩溶勘察中的应用

Application of Crosshole Seismic Wave Computed Tomography in the Offshore Karst Terrain Investigations

岩溶隧道勘察难度大,施工风险极高,能否准确地探测岩溶的分布特征直接关系到施工的成败。地震波跨孔CT操作简便、分辨率高、准确性好,但在海域还没有工程先例。以大连某海域岩溶勘察为例,介绍了地震波跨孔CT层析成像的原理、工作方法及应用效果,结果表明跨孔地震波CT层析成像技术在海域岩溶勘察中具有较高的精度和可信度。

The geological and geotechnical investigations in the proposed tunnel in offshore terrain are very challenge and the construction risk is extremely high. It is therefore critical to accurately characterize the karstic rock. The crosshole seismic wave computed tomography method has the advantages of simple operate, high resolution and high accuracy and receives wide applications in the karst terrain investigations. However, its application in the offshore karstic terrain investigation has not reported. This paper presents a case history of geotechnical investigation of offshore karstic terrain investigation for the proposed cross sea tunnel. The principles, basic operation and applications of the crosshole seismic wave computed tomography method are introduced and the investigation results are satisfactory.