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以隧道掌子面立体数码摄像为基础,针对隧道开挖、支护两道工序,构建隧道掌子面岩体结构量化表征体系,实现隧道轴向岩体结构及径向岩体结构表征的有效整合。针对具体工程,基于控制点测量、掌子面图像对采集、结构面提取、CAD模型再现四道工序,提出了基于数码摄像的二维掌子面裂隙模型构建方法。以测线法为手段,考虑多条测线的全断面布设方法,以单测线RBI指标为基础,以玫瑰花方位角表征测线位置、玫瑰花半径表征对应方位岩体结构RBI量化值,建立了隧道掌子面岩体结构玫瑰花表征体系,实现了隧道径向岩体结构差异性可视化分析。同时,提出了掌子面结岩体结构综合量化指标(Z-RBI),建立了岩体结构六色分类方法,实现了掌子面岩体结构量化及结构类型划分的可视化集成。最后,采用数理方法,以序列掌子面Z-RBI值为基础,初步构建了隧道轴向岩体完整性预测方法,并进行了工程验证。
Based on the three-dimensional digital camera of the tunnel face, aiming at the two procedures of tunnel excavation and support, the quantitative characterization system of the tunnel face rock mass structure is established to realize the tunnel axial rock mass structure and radial rock mass structure characterization Integration. According to the concrete project, based on the measurement of control point, the acquisition of face image, the extraction of structure plane and the reconstruction of CAD model, a method of constructing two-dimensional fractured face model based on digital camera was proposed. Based on the RBI index of single survey line, azimuth of rose is used to characterize the survey line position, and the radius of the rose is used to characterize the RBI quantification value corresponding to the azimuthal rock mass structure. The rosette characterization system of the tunnel facet rock mass structure was established and the visual analysis of the structural difference of the radial rock mass in the tunnel was realized. At the same time, a comprehensive quantitative index (Z-RBI) of the rock face structure of the rock face is proposed, and a six-color classification method of the rock mass structure is established, which realizes the visual integration of the structure quantification and structure type division of the rock face. Finally, based on the Z-RBI value of sequence facets, the method of mathematical prediction is established to predict the integrity of tunnel axial rock mass and the engineering verification is carried out.