基于数字钻孔影像的深部结构面类型识别及发育特征研究

深部岩体中不同类型的结构面对地下水封洞库的稳定性和水封条件产生不同的影响效应,开展深部岩体中结构面类型识别与发育特征研究具有非常重要的意义。结合黄岛地下水封洞库工程,基于数字钻孔影像技术,从曲线的形状、宽度、颜色、交错关系以及曲线周围岩石岩性等方面分析了洞库区深部发育的4类结构面的钻孔影像特征,并以ZK8中120m~-60m 段为例进行了深部结构面类型识别和发育特征研究。结果表明:(1)洞库区各类结构面具有不同的钻孔影像特征,可以借此开展深部结构面发育特征的分类研究; (2)洞库区构造节理和变质分异面发育数量沿纵深方向呈现逐渐减小的特征,且变质分异面仅发育在30m高程以上区域,岩脉侵入节理主要发育于局部较小范围,对洞室群的影响视其发育位置而异。因此应注重对深部结构面发育特征的研究,为工程建设提供翔实可靠的依据。

DIGITAL DRILLHOLE IMAGES BASED IDENTIFICATION OF DISCONTINUITY CLASSIFICATION AND DEVELOPMENT IN DEEP ROCKS

Different types of discontinuities in deep rocks have different effects on the stabilities and water-sealed conditions of underground water-sealed oil storage caverns. So it is very important to identify different types of discontinuities in deep rocks and study the development of the discontinuities. This paper uses the results of drillhole image technique to study the issue in association with the project of underground water sealed oil storage caverns in Huangdao. The drillhole image characteristics of four types of discontinuity are analyzed from the aspects of the shape, width, color and interlace characteristics of the curve as well as the rock characteristics near the curve. The drillhole image in the drillhole ZK8 from 120 m above the sea level to 60m below the sea level is taken to identify different types of discontinuities in rocks and study the development of the discontinuities. Results obtained indicate follows: (1) The discontinuity characteristic of one classification is different from the others. So the development characteristics of the deep-discontinuities can be studied by different classifications according to the drillhole images. (2) The amount of tectonic joints and metamorphic differentiation discontinuities both becomes lower along the direction of depth. The metamorphic differentiation discontinuities only develop above the elevation of 30 m. Dike intrusion joints develop in local areas. Thus their influences to the stabilities of the caverns depend on their positions developed. Therefore, the development characteristics of discontinuities in deep rocks should be paid attention, which can be used for engineering construction.