摘要
甘洛县位于四川省西南部,所处区域高山峡谷地貌特征显著,地质构造运动强烈且为强震影响区,泥石流灾害频发。甘洛县自勒沟分别于1987年和2019年发生两次特大泥石流,大量泥石流堆积物顺沟而下,堵塞245国道和尼日河,并对沟口凉红水电站及尼日河河岸成昆铁路造成严重威胁。对此,基于现场调查资料和无人机航拍数据,利用Massflow数值模拟方法,对该沟泥石流运动特征进行分析以及治理措施防治效果进行预测。结果表明:若沟内现有物源再次爆发泥石流,最大泥深将达到11.9 m,流速达到11.7 m/s,流动强度达到123.37 m^(2)/s,堆积物一次冲出量为11.18×10^(4)m^(3),堆积扇面积为6.925×10^(4)m^(2)。根据预测结果,采用合理的工程措施进行治理后,最大泥深下降为8.5 m,流速下降为9.1 m/s,而流动强度可下降52.7%,为58.32 m^(2)/s,堆积扇面积和一次冲出量分别为1.406×10^(4)m^(2)和2.75×10^(4)m^(3),分别下降80%和75%。这表明,采用固源为主,拦挡、排导为辅的措施对自勒沟泥石流灾害进行治理,可取得较好治理效果,对保护沟口建筑及成昆铁路安全运营有重要意义。
Ganluo County is located in the southwestern part of Sichuan Province,China.This area exhibits significant geomorphic characteristics of high mountains and valleys,experiences strong geological tectonic movement,strong earthquake affected area and frequent debris flow disasters.The debris flows occur frequently because of the strong geological tectonic movements and earthquakes.Two large-scale debris flows occurred in Zile Valley of Ganluo County in 1987 and 2019,a large amount of debris flow deposits flowed down the valley,blocking the G245 national road and the Niri River,posing a serious threat to the Liang Hong hydropower station at the mouth of the valley and the Chengdu-Kunming Railway on the left bank of the Niri River.In response to this,based on field survey data and UAV aerial photography,the Massflow numerical simulation method was used to analyze the movement characteristics and predicted prevention effect of debris flow in Zile Valley.The results show that if the debris flow breaks out in the valley again based on the existing sources,the maximum mud depth will reach to 11.9 m,the maximum mud velocity will reach to 11.7 m/s.The flow intensity will reach to 123.37 m^(2)/s.The total volume of material flushed out is 11.18×10^(4) m^(3),and the accumulation fan area is 6.925×10^(4) m^(2).According to the prediction,after adopting reasonable engineering measures,the maximum mud depth is reduced to 8.5 m,the flow intensity is reduced by 52.7%to 58.32 m^(2)/s,the accumulation fan area is reduced by 80%to 1.406×10^(4) m^(2),and the total volume of material flushed out is reduced by 75%to 2.75×10^(4) m^(3).This shows that the measures to manage the debris flow disaster in Zile Valley,which are mainly based on braced source and supplemented by blockage and drainage,can achieve better management effect and have great significance to protect the gully construction and safe operation of Chengdu-Kunming railway.
作者
邱恩喜
王彬
孙希望
张蕊
万旭升
渠孟飞
贺建军
QIU Enxi;WANG Bin;SUN Xiwang;ZHANG Rui;WAN Xusheng;QU Mengfei;HE Jianjun(School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Geohazard Prevention and Geo‑environment Protection(SKLGP),Chengdu 610059,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2023年第5期934-945,共12页
Journal of Disaster Prevention and Mitigation Engineering
基金
地质灾害防治与地质环境保护国家重点实验室开放基金资助项目(SKLGP2021K017)
岩土力学与工程国家重点实验室开放基金资助项目(SKLGME021014)
四川高速公路建设开发集团有限公司科技项目(2022‑cg‑ky‑3)
中国中铁2020‑引导‑301研究项目(2020)
国家自然科学基金(42071087)资助。
关键词
自勒沟
泥石流
数值模拟
运动特征
zile valley
debris flow
numerical simulation
movement characteristic
