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      长阳鸡公岩危岩带落石运动特征与防护措施研究

      Research on rockfall movement characteristics and protective measures of dangerous rock zone of Changyang Jigong rock

      • 摘要: 针对湖北省宜昌市长阳县鸡公岩危岩带多年来常有落石发生,威胁公路和清江航道安全的问题,基于无人机摄影和现场调查数据,采用RocFall和Rockfall Analyst软件模拟落石的运动轨迹,并根据熵权法得到相关因素权重,通过多重因素叠加分析得到该危岩带危险性分区图,从而提出修建明洞的防护措施。结果表明:该危岩带主要的破坏模式为坠落式破坏,危岩带中东部大部分落石会直接撞击公路,其余则跃过公路平台,滚入清江中;西部大部分落石则会在植被覆盖区域停止运动,未对公路来往人员及车辆造成威胁。中东部近邻公路坡度较陡区域属于极高风险区,因此在该区域修建顶部具有缓冲层的明洞。通过采取防护措施前后的模拟结果对比,验证了该措施可以有效阻挡落石,保证公路和清江航道的安全。

         

        Abstract: Addressing the persistent rockfall hazards along the Jigong unstable rock zone in Changyang County, Yichang Province, which have long threatened the operational safety of both the highway and the Qingjiang waterway, this study employed UAV photography and field survey data. By using Rocfall and Rockfall Analyst software to simulate rockfall trajectories, and applying the entropy weighting method to determine factor weights, a multi-factor overlay analysis yielded a hazard ous zoning map for the unstable rock zone. This analysis proposed the construction of an open-cut tunnel as a protective measure. Results indicated that the primary failure mode of the dangerous rock zone was free-falling rock. The majority of rockfalls in the central-eastern section struck the highway directly, while others leaped over the roadway platform and tumbled into the Qingjiang River. Conversely, most rockfalls in the western section ceased the movement within vegetation-covered areas, posing non threat to passing pedestrians or vehicles on the highway. The steeply sloping areas adjacent to the road in the central-eastern zone constituted an extremely high-risk zone. Therefore, an open-cut tunnel with a buffer layer at its crown should be constructed in this area. Comparison of simulation results before and after implementing protective measures verified that this approach could effectively block falling rocks, ensuring the operational safety of both the highway and the Qingjiang river waterway.

         

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