He Na, Li Yuyang, Xu Linjuan, Yang Zhiquan, Gurkalo Filip
School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454000, China.
GongQing Institute of Science and Technology, Gongqingchengshi, 332020, China.
Sci Rep. 2024 Sep 27;14(1):22397. doi: 10.1038/s41598-024-73305-y.
The occurrence of frequent debris flow catastrophes in the mountainous regions of southwest China has necessitated the inclusion of debris flow disaster analysis and prevention as an essential component in the planning and construction of mountainous roadways. Daxilada watershed is located in the south of Mabian Yi Zuzizhixian, Leshan City, Sichuan Province, and the proposed Leshan-Xichang Expressway (Lexi Expressway) will pass through the upper reaches of Daxilada watershed. It is essential to consider that the presence of debris flows within the Daxilada watershed could have detrimental effects on the construction and functionality of the proposed Luoshanxi Bridge. This study examined the Daxilada watershed as a case study and analyzed the factors contributing to debris flow formation in the area. This analysis was based on field investigations, remote sensing interpretation, and experimental analysis. Additionally, the study utilized the Massflow software to simulate debris flow movement. It integrated the simulation results to determine the potential hazards the Daxilada Gully debris flow posed to the line project. This study found that Daxilada Gully meets debris flow formation conditions. The simulation results demonstrated that during the debris flow activity, there would be a maximum deposition depth of 2.1 m in the proposed Engineering Agency, which may lead to siltation and blocking disaster of the line project. Concerning the parameters related to the debris flow with a frequency of one in a hundred years, in conjunction with the outcomes obtained from numerical simulation, it would provide the design basis of the cross-flow cross-section of the proposed bridge. In a quantitative analysis of the blockage situation in the gully, debris flow deposits have the potential to cause damage to the line project. Debris flow deposits block the gully, but the risk of blockage is small. The study results have specific reference values for the debris flow prevention and control project of Lexi Expressway and offer valuable insights for the prevention and mitigation of similar disasters in relative projects.
中国西南部山区频繁发生泥石流灾害，因此在山区道路规划和建设中，将泥石流灾害分析与防治作为重要组成部分很有必要。大西拉达流域位于四川省乐山市马边彝族自治县南部，拟建的乐山至西昌高速公路（乐西高速公路）将穿过大西拉达流域上游。必须考虑到大西拉达流域内的泥石流可能会对拟建的罗山溪大桥的建设和功能产生不利影响。本研究以大西拉达流域为案例进行分析，剖析了该地区泥石流形成的影响因素。该分析基于实地调查、遥感解译和实验分析。此外，本研究利用Massflow软件模拟泥石流运动。通过整合模拟结果，确定大西拉达沟泥石流对线路工程可能造成的潜在危害。本研究发现大西拉达沟满足泥石流形成条件。模拟结果表明，在泥石流活动期间，拟建工程处最大淤积深度为2.1米，可能导致线路工程发生淤堵灾害。针对百年一遇泥石流的相关参数，结合数值模拟结果，可为拟建桥梁的跨流断面设计提供依据。在对沟内堵塞情况的定量分析中，泥石流堆积物有可能对线路工程造成破坏。泥石流堆积物堵塞沟道，但堵塞风险较小。研究结果对乐西高速公路泥石流防治工程具有一定的参考价值，为相关工程类似灾害的预防和减灾提供了有益借鉴。
