基于地面三维激光点云的滑坡破坏边界岩体结构特征分析

doi:10.13722/j.cnki.jrme.2020.0835

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摘要岩质滑坡边界受岩体结构控制，通过三维激光点云能快速获取滑坡边界岩体结构信息，为滑坡成因分析提供数据基础。2008年汶川Ms8.0级地震在绵阳安州区黄洞子沟碳酸盐岩地区触发了大量滑坡，选择区内照壁岩滑坡，利用地面三维激光扫描获取滑坡边界点云数据，基于HSV(hue saturation value)色彩重建技术与基于密度的带噪声空间聚类(DBSCAN)算法，识别了42万余个结构面数据(产状、间距、延续性和粗糙度(JRC))，进行滑坡破坏边界岩体结构特征分析。结果表明：(1) 照壁岩滑坡是由整体平整的北侧和南侧边界，以及陡峭的后壁边界组成的楔形体破坏；(2) 滑坡破坏边界发育8组结构面(J1～J8)，通过与黄洞子沟区域结构面对比确定，除先期结构面外，J5和J8为与滑坡启动相关的新生结构面；(3) 8组结构面间距0.42～5.97 m，发育具有不均匀性，间距较小的结构面(J2，J3，J5，J6)对滑坡边界形成贡献较大；滑坡两侧边界受延续性较高(10.9，9.37 m)的结构面(J1，J2)控制，后壁受延续性较低(2.63～7.22 m)的结构面(J3，J4，J6，J7和J8)控制；(4) 滑坡北侧边界JRC值(2～12)最小，两侧边界JRC值(6～16，2～12)小于后壁JRC值(15～35)。基于岩体结构特征数据，认为滑坡破坏边界具有显著的构造成因，依赖构造节理延续性和间距的断面阶步、以及依赖滑坡滑动方向的断面擦痕共同影响了滑坡两侧破坏边界上的粗糙程度，后缘边界是在多组结构面组合控制模式下以拉裂为主破坏的结果。研究成果为类似滑坡破坏边界的形貌和结构研究提供参考。

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	梁玉飞1
	2
	裴向军1
	崔圣华1
	3
	黄润秋1
	李天涛1
	许向宁4
	董秀军1
	谭淋耘1
	杨华阳4

关键词 ：边坡工程, 楔形体滑坡, 岩体结构, 三维激光扫描, 自动识别, 破坏模式

Abstract：The boundary of rock landslides is controlled by the rock mass structure，and the rock mass structure information can be quickly obtained by three-dimensional laser point cloud，which provides basic data for landslide genesis analysis. The 2008 Wenchuan Ms 8.0 earthquake triggered numerous landslides in the carbonate area of Huangdongzi gully，Anzhou district，Mianyang. In this paper，the Zhaobiyan(ZBY) landslide in the area is selected as an example，and the landslide boundary point clouds are obtained by three-dimensional laser scanning. Based on HSV-colored reconstruction technology and DBSCAN clustering algorithm，more than 420 000 structural data(attitude，spacing，persistence and roughness(JRC)) are identified，and the structural characteristics of the rock mass are analyzed. The results show that the ZBY landslide is a wedge failure composed of overall flat north and south boundaries and a steep back wall. Eight groups of rock mass structural planes(J1–J8) are developed on the ZBY landslide boundary，among which, by comparing with the structural planes of Huangdongzigou gully，J5 and J8 are new structural planes related to the initiation of the landslide. The average spacing of 8 groups of structural planes ranges from 0.42 to 5.97 m，showing uneven development. The structural planes with a small spacing (J2，J3，J5，J6) contribute more to the formation of the landslide boundary. The boundaries on the both sides of the landslide are controlled by the structural planes J1 and J2 with a higher persistence of 10.9 m and 9.37 m respectively，while the back wall is controlled by the structural planes of J3，J4，J6，J7 and J8 with a lower persistence ranging from 2.63 m to 7.22 m. The JRC value(2–12) of the north boundary of the landslide is the smallest，and the JRC values(6–16，2–12) of the two sides of the landslide are smaller than that of the back wall(15–35). Based on the characteristic data of the rock mass structure，it is believed that the landslide boundary has significant tectonic origin. The section steps depending on the persistence and spacing of structural joints and the section scratches depending on the sliding direction of the landslide affect the roughness of the failure boundary on both sides of the landslide. The trailing edge boundary is the result of the main damage caused by tensile fracture under the control of multiple structural planes. The research results provide a reference for the study of morphology and structure of similar landslide failure boundary.

Key words： slope engineering wedge landslide rock mass structure three-dimensional laser scanning automatic identification technology failure mode

引用本文:

梁玉飞1，2，裴向军1，崔圣华1，3，黄润秋1，李天涛1，许向宁4，董秀军1，谭淋耘1，杨华阳4. 基于地面三维激光点云的滑坡破坏边界岩体结构特征分析[J]. 岩石力学与工程学报, 2021, 40(6): 1209-1225.
LIANG Yufei1，2，PEI Xiangjun1，CUI Shenghua1，3，HUANG Runqiu1，LI Tiantao1，XU Xiangning4，DONG Xiujun1，TAN Linyun1，YANG Huayang4. Analysis of rock mass structure characteristics of landslide boundaries based on ground 3D laser point cloud. , 2021, 40(6): 1209-1225.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0835 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I6/1209

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