基于钻孔摄影方法的岩体中结构面连通性分析

Analysis on Discontinuities Connection Basing on Borehole Photography Method

将钻孔摄影方法推广到多孔结构面连通中,从结构面产状、地质特征等角度提出了连通性判别依据,并运用龙江特大桥桥基摄像勘察结果检验了该方法的可行性.其中,选择了位于大桥一侧的3个钻孔,在对孔内的结构面地质特征、产状等参数进行分析和计算的基础上,根据结构面连通原理进行对比和筛查,共得到3组2孔连通结构面和2组3孔连通结构面.结果表明,所有可连通结构面产状相似、空间位置满足共面的要求,并且组成结构面的岩体及周围环境岩体特征相似.将基于钻孔摄影技术的结构面连通方法用于该工程中可行.

This paper extended the photography technique to multi-hole occasion and proposed the connection evidences from aspects of orientation and geological characteristics.It also applied the method to foundation investigation of Longjiang Super-major Bridge to test its reliability.It chose three boreholes on the same side of the bridge,on the basis of analyzing and calculating the parameters including spatial position,geological characteristic,orientation and width of the discontinuities.It then contrasted and screened the discontinuities according to connectivity principle,and finally got three discontinuities between two boreholes and two discontinuities among three boreholes.The discontinuities that could be connected own the similar orientations and their spatial positions meet the requirements of lying in the same plane.In addition,the rocks that formed or around the discontinuities own the similar characteristic.The results indicate that it is practicable to apply discontinuity connection method to the engineering.