凌斯祥, 李乐, 石奥博, 等. 2024. 上木江坪高陡斜坡危岩特征与定量风险评估[J]. 工程地质学报, 32(3): 1083-1097. doi: 10.13544/j.cnki.jeg.2024-0083.
    引用本文: 凌斯祥, 李乐, 石奥博, 等. 2024. 上木江坪高陡斜坡危岩特征与定量风险评估[J]. 工程地质学报, 32(3): 1083-1097. doi: 10.13544/j.cnki.jeg.2024-0083.
    Ling Sixiang, Li Le, Shi Aobo, et al. 2024. Development characteristics and quantitative risk assessment of dangerous rocks exit high-steep Shangmujiangping hillslope at mountain transportation corridor[J]. Journal of Engineering Geology, 32(3): 1083-1097. doi: 10.13544/j.cnki.jeg.2024-0083.
    Citation: Ling Sixiang, Li Le, Shi Aobo, et al. 2024. Development characteristics and quantitative risk assessment of dangerous rocks exit high-steep Shangmujiangping hillslope at mountain transportation corridor[J]. Journal of Engineering Geology, 32(3): 1083-1097. doi: 10.13544/j.cnki.jeg.2024-0083.

    上木江坪高陡斜坡危岩特征与定量风险评估

    DEVELOPMENT CHARACTERISTICS AND QUANTITATIVE RISK ASSESSMENT OF DANGEROUS ROCKS EXIT HIGH-STEEP SHANGMUJIANGPING HILLSLOPE AT MOUNTAIN TRANSPORTATION CORRIDOR

    • 摘要: 青藏高原东缘高陡斜坡危岩体严重威胁山区交通廊道的建设、运营与维护。本文以青藏高原东缘上木江坪高陡斜坡为研究对象,研究斜坡危岩体的崩塌落石对都四铁路和G350国道的危险性与定量风险,对山区交通廊道崩塌落石的防灾减灾具有重要意义。联合现场调查与无人机航空摄影技术,重建了高陡斜坡高精度三维地形,获取危岩体节理面产状,基于赤平投影明确了斜坡危岩体的破坏模式和稳定性。采用三维落石模拟软件RockyFor3D模拟了斜坡崩塌落石的运动轨迹,定量评估了落石危害范围、危险性分区与对道路车辆的定量风险。研究结果表明:斜坡后壁存在3处危岩体(A、B、C),分别且受3组节理控制,斜坡破坏为楔形破坏为主,斜坡危岩体处于基本稳定-不稳定状态。通过落石三维运动模拟可知,落石的运动轨迹受地形控制,在坡降较大位置,最大弹跳高度、最大速度与最大动能呈陡增趋势。危岩体A和B不会对都四铁路与G350国道产生威胁,仅使G350国道服务区西边和西南边缘处于极低危险区,其车辆风险均处于可接受风险区。危岩体C将使G350国道服务区、G350国道和都四铁路隧道口均处于极低-低危险区,对都四铁路和G350国道的车辆遇到落石的定量风险位于风险警告区,应对危岩体C的崩塌落石制定相应防灾减灾对策。

       

      Abstract: Rockfalls occur frequently on high-steep hillslopes in the eastern margin of the Tibet Plateau,posing a serious threat to the construction,transport,and maintenance of mountainous transport corridors. The rockfall hazard and risk assessment on Dusi railway and G350 road were analyzed at Shangmujiangping high-steep hillslope,which is a good example to guide rockfall prevention and mitigation in mountain traffic corridors. The orientation information of joints can be acquired from on-site surveys combined with unmanned aerial photography technology,which can reconstruct the high-precision three-dimensional digital surface model of high-steep hillslopes. The failure model and stability of dangerous rockmass of the hillslope are evaluated through stereographic projection. The rockfall trajectory was simulated using 3D rockfall software of RockyFor3D,which can quantitatively and visually assess the rockfall hazard area,hazard zone,and rockfall risk of vehicles on Dusi railway and G350 road. The results show that there are three dangerous rockmass zonings A,B,and C on the scarp of the hillslope,which are controlled by three groups of joints. The failure model of dangerous rockmass is wedge failure associated with slope stability ranging from basically stable to unstable states. The rockfall trajectory is controlled by the terrain of the hillslope,resulting in the maximum bounce height,maximum velocity,and maximum kinetic energy increasing sharply at positions with large descents. The dangerous rockmass zonings A and B do not threaten the Dusi railway and G350 road,whereas they result in a very low hazard level at the northwestern and southwestern edges of the G350 road service area. The rockfall risk of vehicles is located in an acceptable risk zone. The dangerous rockmass zoning C will make the G350 road service area,G350 road,and Dusi railway located in a very low to low hazard level. Therefore,the vehicles on the Dusi railway and G350 road are both located in a risk warning zone,which requires the formulation of corresponding rockfall prevention and mitigation measures in dangerous rockmass zoning C.

       

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