He Na, Han Ruze, Hu Guisheng, Yang Zhiquan, Xu Linjuan, Gurkalo Filip
School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454000, China.
GongQing Institute of Science and Technology, Gongqingchengshi, 332020, China.
Sci Rep. 2024 Jun 12;14(1):13533. doi: 10.1038/s41598-024-64279-y.
Assessments of highway feasibility frequently lack the detailed data and geological information necessary to conduct hazard evaluations of debris flows. This study discusses the processes of debris flow development when regional rainfall meets the critical level required for debris flow initiation. It utilizes geomorphic evolution theory and establishes a regional risk assessment matrix for debris flow by combining information about gullies and source sensitivity. Considering the location relationship between the highway and debris flow gullies, a rapid evaluation method for debris flow risk assessment along the G318 highway in Sichuan Province is proposed by modifying the judgment matrix. The four debris flow gullies constructed during the upgrading project in Yajiang County, stretching from the west of the city to the Shearer Bay section, were analyzed via examples. The results show that, among the four selected debris flow gullies, two had medium hazard levels, and two had high hazard levels. The validation results are consistent with the actual results, implying that the evaluation method used in this study is accurate and feasible. This method is suitable for the rapid evaluation of debris flow disaster hazards in the feasibility assessment stage of a highway because it relies on readily available data sources, and the evaluation results are fast and convenient. The highway passes through four debris flow gullies, which directly impact the alignment of this particular section of the geological route and the engineering layout. Based on current specifications, the maximum impact range of a one-time debris flow under the given frequency conditions was calculated using the "rainfall method." The results showed that the maximum impact ranges of a debris flow, occurring once in 100 years, for four gullies would be 9.08 m, 9.09 m, 10.86 m, and 10.08 m. The safe clearance heights of bridges over the four gullies should be 14.58 m, 14.59 m, 16.36 m, and 16.3 m. Additionally, the safety clearance width for all gullies should be 5.0 m.
公路可行性评估往往缺乏开展泥石流灾害评估所需的详细数据和地质信息。本研究探讨了区域降雨达到泥石流启动所需临界水平时泥石流的发育过程。利用地貌演化理论，结合沟壑信息和源敏感性，建立了泥石流区域风险评估矩阵。考虑公路与泥石流沟壑的位置关系，通过修正判断矩阵，提出了四川省G318公路沿线泥石流风险评估的快速评估方法。以雅江县升级改造项目中从城西至采煤湾段新建的4条泥石流沟壑为例进行了分析。结果表明，在选取的4条泥石流沟壑中，2条为中等危险等级，2条为高危险等级。验证结果与实际结果一致，表明本研究采用的评估方法准确可行。该方法适用于公路可行性评估阶段泥石流灾害的快速评估，因为它依赖于容易获取的数据源，评估结果快速便捷。公路穿过4条泥石流沟壑，直接影响该段地质路线的线形和工程布局。根据现行规范，采用“降雨法”计算了给定频率条件下一次泥石流的最大影响范围。结果表明，4条沟壑100年一遇泥石流的最大影响范围分别为9.08米、9.09米、10.86米和10.08米。4条沟壑上桥梁的安全净空高度应为14.58米、14.59米、16.36米和16.3米。此外，所有沟壑的安全净空宽度应为5.0米。
