ISSN 1003-8035 CN 11-2852/P

    危岩体精细调查与崩塌过程三维场景模拟以西南某水电站高边坡为例

    Comprehensive analysis of hazardous rock mass and simulation of potential rockfall processes using 3D terrain model: A case studyof the high cut slope near damsite of a hydropower stationin southern China

    • 摘要: 西南山区水电站两侧陡峻边坡发育有大量危岩体,危岩体滚动滑落、崩塌掉块等现象给电站的大坝、主要建筑物、厂房、道路、支护边坡等的正常运营带来了很大影响。现阶段针对危岩崩塌灾害的预测和防护多是忽略危岩体空间几何形状的二维Rockfall方法和人为截取优势剖面,但实际落石为三维运动,其威胁区域为一个地理上的三维空间。鉴于此,以西南某水电站危岩体隐患排查结果为基础,采用现场调查,机载LiDAR遥感测量技术和无人机倾斜摄影技术,获取研究区高精度的激光雷达点云数据,构建精细危岩体模型和真实三维实景模型,进行历史崩塌落石分布特征、岩体结构产状及崩塌源区危岩体特征和危岩体失稳模式的分析,结合Unity3D三维落石分析方法进行危岩崩落后的运动特征模拟,实现危岩崩落的运动路径及在不同位置上的弹跳高度、冲击能量和滚落区域等参数的获取。结果表明:水电站右岸危岩区块一典型危岩体的弹跳高度最大可达7.92 m,影响范围约145 m,多滚落至大坝,已设置多级被动防护网,不会对电厂内重要设施构成威胁,右岸危岩区块二发育的危岩体崩落后,落石影响范围约为120 m,部分落石会沿着公路护坡滚动到道路上,可能威胁交通要道;左岸危岩区块一发育典型危岩体体积巨大,稳定性差,其崩落后最大弹跳高度可达9.02 m,最终会落入水库蓄水区;左岸危岩区块二危岩分布密集,数量多,崩落后影响范围约为380 m,但受坡表植被茂密的影响,多数落石停积在坡表,对行人车辆有一定的威胁。相关研究成果可为类似水电设施危岩体隐患识别与落石运动模拟提供一定的参考。

       

      Abstract: The steep slopes on both sides of the hydropower station in the southwestern mountainous region develop a multitude of dangerous rock formations. The rolling, collapsing and falling of these hazardous rocks have profound implications on the normal operation of the dam, main buildings, factories, roadways, and slope support systems. At present, the prediction and protection measures against rockfall disasters are predominantly reply on the two-dimensional Rockfall method, which ignores the spatial geometry of these dangerous rocks. In reality, falling rockfalls exhibit three-dimensional motion, and their threat zone extends throughout a three-dimensional geographical space. In view of this, this study is based on the hazard assessment results of the hidden danger investigation in a specific hydropower station of Yunnan Province. It employs field investigations, airborne LiDAR remote sensing measurement technology, and unmanned aerial vehicle (UAV) oblique photography technology to obtain high-precision laser radar point cloud data for the study area. This data is used to constrct detailed rock mass models and authentic three-dimensional scene models. The analysis includes historical rockfall distribution characteristics, rock mass structural characteristics, characteristics of hazardous rock masses in collapse source areas, and unstable modes. Furthermore, the study utilizes Unity3D three-dimensional rockfall analysis methods to simulate the motion characteristics of dangerous falling rocks after collapse. This enables the determination of the trajectory of dangerous falling rocks, as well as parameters such as bounce height, impact energy, and rolling area at different locations. The results indicate that for the right bank dangerous rock area of the hydropower station, a typical dangerous rock mass can achieve a maximum bounce height of up to 7.92 meters, with an impact range of approximately 145 meters. Most of these rocks roll towards the dam, which has multiple levels of passive protection nets and does not pose a threat to important facilities within the power plant. In the case of the right bank dangerous rock area two, after the collapse of dangerous rocks masses, the impact range of the falling rocks is approximately 120 meters, and some of the falling rocks may roll along the road embankment onto the road, potentially posing a threat to the main traffic artery. On the left bank, dangerous rock area one has a massive and unstable typical rock mass, with a maximum bounce height of up to 9.02 meters, ultimately falling into the reservoir storage area. Hazardous rock area two on the left bank has a dense distribution of hazardous rock masses, with a significant quantity, and after collapse, the impact range is approximately 380 meters. However, due to the dense vegetation cover on the slope, most of the falling rocks accumulate on the slope surface, posing a certain threat to pedestrians and vehicles. The related research results can provide valuable insights for the identification of hazardous rock masses and simulation of rockfall events in similar hydropower facilities.

       

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