钻孔综合物探新技术在隔河岩工程应用研究

 采用钻孔综合物探新技术,探测隔河岩工程坝基岩溶并对大坝帷幕灌浆质量进行检测,满足了工程地质及设计、施工部门的要求。文中阐述了电磁波、地震波层析成象技术及其实现方法,利用改进型联合迭代法对帷幕灌浆前后实测资料进行层析成象结果表明,坝基浅部发育一定规模的岩溶,坝基深部岩溶不发育。查明了301夹层的范围及其延伸方向。坝基岩体经灌浆处理后,岩体性状(依据V_p及β_3)得到了一定的改善,灌浆效果显著。

Application Study on New Technique of Borehole Comprehesive Geophysical Exploration in Genevan Project

New technique of borehole comprehensive geophysical exploration used for detectingkarst cavities in dam foundation and effect of screen grouting quality in Geheyan project satisfies the re quirments of engineering geology and design departments. This paper presents the technology of electro magnetic wave and seismic wave tomography and the method of observation. The results from tomogra phy images before and after grouting, using advanced SIRT, show that there are some karst cavities with certain scale in shallower dam foundation and very few ones in deeper foundation. Range and the extension direction of interbed No. 301 have been located. After grouting, the rock mass properties of the dam foundation have been improved in a certain degree, based on velocity V and apparent ab sorbance factor B. The effert of grouting in Geheyan project is significant.