摘要
通过计算分析2010年8月14日四川省都汶高速公路银杏坪沟的泥石流运动特征参数与实地调查,探讨调查中泥石流流量计算偏小的原因。研究结果表明:(1)“8·14”银杏坪沟泥石流的降雨强度为十年一遇,各支沟和主沟泥石流性质属黏性;(2)断面平均流速为6.6~14.6 m/s,一次泥石流总量最大为0.352×10^6 m^3,一次泥石流固体物质冲出量最大为0.192×10^6 m^3;(3)银杏坪沟内存在堵溃导致实测断面流量与配方法计算的峰值流量结果存在较大差异,以及其他运动参数的波动。堵溃和大颗粒物质是导致泥石流特征参数出现波动的原因,在调查中应先考虑沟道是否存在堵溃进而指导泥石流野外勘查与设计。
The debris flow occurred on August 14,2010 at Yinxingping gully near Duwen Expressway of Sichuan Province is investigated and its debris flow movement characteristic parameters are calculated and analyzed in order to discuss the reason why the calculation of debris flow is small.It shows that the rainfall intensity of debris flow is once in a decade,and debris flow in each branch and main ditch is viscous.The calculation reveals that the average sectional velocity is 6.6~14.6 m/s,and the maximum amount of debris flow in one debris flow is 0.352×10^6 m^3,and the maximum amount of solid material rushed out in one debris flow is 0.192×10^6 m^3.However,there is a big difference between the measured section flow and the calculated results of peak flow as well as fluctuations in other motion parameters because of the existence of debris blockage in Yinxingping ditch.It is proposed that the debris blockage and large particles are responsible for the fluctuation of debris flow characteristic parameters.Therefore,the existence of channel blockage should be considered first to guide the field exploration and design of debris flow.
作者
李睿祺
胡桂胜
杨志全
陈宁生
LI Ruiqi;HU Guisheng;YANG Zhiquan;CHEN Ningsheng(Key Laboratory of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041,China;Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第5期625-634,共10页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
四川省重大研发项目(2018SZDX0034-2)
国家重点研发计划课题(2018YFC1505202)。
关键词
线性工程
大规模泥石流
银杏坪沟
运动特征参数
堵溃点
linear engineering
large-scale debris flow
Yinxingping ditch
dynamic parameters
block and burst place
