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| Analysis of rock mass structure characteristics of landslide boundaries based on ground 3D laser point cloud |
| LIANG Yufei1，2，PEI Xiangjun1，CUI Shenghua1，3，HUANG Runqiu1，LI Tiantao1，XU Xiangning4，DONG Xiujun1，TAN Linyun1，YANG Huayang4 |
| (1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. Department of Civil Engineering，University of Alicante，Alicante 03080，Spain；3. Disaster Prevention Research Institute，Kyoto University，Kyoto 6110011，Japan；4. 405 Geological Brigade，Sichuan Bureau of Geology and Mineral Resources，Chengdu，Sichuan 611830，China) |
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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.
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2021, Vol. 40 
