孔间电磁波CT法在左江电站火成岩坝基风化结构评价中的应用

孔间电磁波CT法不仅在岩溶探测以及岩浆岩地层岩石风化界面的探测，有广阔的应用前景。针对左江电站坝基岩浆岩地层的霏细岩，岩石中含石英、长石、蒙脱石等矿物，加上应力作用易隐存风化界面及软弱夹层，直接影响坝基安全。提出运用不断改进的孔间电磁波法及CT处理软件，对所获数据进行反演成像，结果显示，实际观测的吸收系数值与岩样测试结果基本吻合。在所探查的3对钻孔剖面，数字图像清晰给出了岩石结构和风化层界面深度，结果已得到钻探验证，为左江电站坝基帷幕灌浆深度提供了可靠依据。

Application of cross-well electromagnetic wave CT technique to evaluating weathered igneous rock dam structure of Zuojiang river power station

The hole between the electromagnetic wave CT method can not only detect and igneous rock formation in the karst rock weathering interface detection, has broad application prospects. Foundation for the power station on the left felstone igneous rock formation, rock containing quartz, feldspar, montmorillonite and other minerals, together with stress easily hidden weathering weak interlayer interface and a direct impact on dam safety. Made between the use of continuous improvement of the hole electromagnetic method and the CT processing software, data obtained from the inversion of the imaging. The results show that the absorption coefficient value of the observed specimen test results shows good agreement. In the detection of three pairs of drilling section, digital images are given a clear structure and the weathered rock layer interface depth, drilling results have been validated for the Zuojiang river dam foundation grouting curtain depth to provide a reliable basis.