Identification of dangerous rock structural planes and fracture network model in Danxia landform based on UAV aerial survey:A case study at simianshan scenic area of Chongqing
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摘要:
丹霞地貌地区是我国地质灾害高发区，裸露的近水平红色砂岩、砾岩陡崖是其最主要的地质特征。在地质构造与包括化学溶蚀、物理风化、重力和生物等内外动力作用下，陡崖岩体节理裂隙十分发育，危岩崩滑灾害表现出变形模式复杂、破坏力强的特点，并且由于坡体结构复杂，工程勘察难度大。为此，以四面山景区滴水岩变形危岩为例，介绍了一种基于无人机勘查技术的高陡破碎岩坡表生节理面的野外快速识别方法及高精度图像建模方法，在准确把握危岩体控制结构面的空间展布特征的基础上，建立了符合丹霞地貌高位破碎危岩的三维随机裂隙网络模型。以期为地区危岩稳定性评价与防治工作提供理论指导。
Abstract:Danxia landform is an area with high incidence of geological disasters in China. The exposed near-horizontal red sandstone and conglomerate steep cliffs are the most important identification elements. Under the internal and external dynamic action of geological structure, including chemical dissolution, physical weathering, gravity and biology, the rock mass of steep cliff is often extremely broken, and the disaster of dangerous rock collapse and slide is particularly prominent, the deformation mode is complex, the destructive power is strong, and because of the complex slope structure, the engineering investigation is difficult. So, with a deformation dangerous rock mountain scenic area as an example, this paper proposes a high-location and steep broken should based on the technology of unmanned aerial vehicle to the exploration of supergene field quickly identify methods for joint, and the accurate grasp the dangerous rock mass on the surface of the control structure on the basis of the spatial distribution characteristics of breakage of dangerous rock is established in Danxia landform high three-dimensional random fracture network model.It is expected to provide theoretical guidance for the stability evaluation and prevention of dangerous rock in the region.
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表 1 结构面优势分组结果
Table 1. Structural plane for the group advantage
分组 类型 倾向/(°) 倾角/(°) 样本① 样本② 样本③ 平均值 样本① 样本② 样本③ 平均值 Ⅰ 岩层层面 328.75 328.53 282.56 313.28 9.75 10.69 9.94 10.13 Ⅱ 节理J1 210.48 215.66 203.91 210.02 84.71 86.01 84.56 85.10 Ⅲ 节理J2 127.19 122.47 125.24 124.97 89.69 87.63 81.54 86.29 Ⅳ 节理J3 279.62 305.55 287.48 290.88 33.53 20.36 39.20 31.03 
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