基于数字钻孔图像的岩体结构面连通性判别方法与试验研究

Identification Method and Experimental Study on Structural Plane Consistency of Rock Mass Based on Digital Borehole Image

结构面是具有一定规模的地质界面,判断结构面在空间上的延展范围是岩体结构研究中的重要内容。通过空间几何与向量分析等数学方法,推导出多个钻孔内结构面连通性的判别方法,快速筛选出可能连通的结构面,并结合相关特征进一步判断结构面连通性,形成一套基于数字钻孔图像的结构面连通性判别方法,并开展室内试验对判别方法进行验证,在试块中预设特定参数结构面,设置多组钻孔并开展钻孔摄像测试,识别提取钻孔图像中的结构面信息,进行结构面连通性分析。试验结果表明:结构面连通性判别方法在平直结构面和有一定起伏角与粗糙度的结构面中都可以适用;钻孔倾斜不影响利用钻孔摄像判断结构面连通性,空间内任意两个钻孔内的结构面均可以此方法判断结构面连通性;该分析方法能够快速完成结构面连通性判别,适合深钻孔海量结构面的连通性判别及筛选。岩体结构面连通性判别方法成功应用于西昌铁矿的边坡勘测工程,得到了矿山边坡内部结构面与破碎带分布及其连贯性信息,为滑坡灾害预警、边坡加固方案提供了参考。

The structural plane is a geological interface with a certain scale.It is an important content in the study of rock mass structure to judge the spatial extension range of the structural plane.Through mathematical methods such as spatial geometry and vector analysis,the identification method of structural plane consistency in multiple boreholes was derived,and the possible connected structural planes were quickly screened out,and the structural plane consistency was further judged in combination with relevant features,a set of identification method of structural plane consistency based on digital borehole image was formed,and the indoor test was carried out to verify the identification method.The structural plane of specific parameters was preset in the test block,multiple groups of boreholes were set up and borehole photography tests were carried out to identify and extract the structural plane information in the borehole images,and structural plane consistency analysis was carried out.The test results show that the identification method of structural plane consistency can be applied to straight structural planes and structural planes with certain undulating angles and roughness.The inclination of borehole does not affect the judgment of structural plane consistency by borehole camera,and the structural plane in any two boreholes in space can be judged by this method.The analysis method can quickly complete the identification of structural planes consistency,which is suitable for the discrimination and screening of massive structural planes consistency in deep boreholes.The identification method of rock mass structural plane consistency is successfully applied to the slope survey project of Xichang Iron Mine,and the distribution and continuity information of internal structural plane and fracture zone of mine slope are obtained,which provides a reference for landslide disaster warning and slope reinforcement scheme.