摘要
为探明甘肃省舟曲县泥石流成因,保护人民生命财产安全,以舟曲县水泉沟流域泥石流为研究对象,在调查分析研究区地质环境条件的基础上,采用区域测量、地面调查和地下勘探等手段,查明了泥石流的特征,分析了泥石流的成因,并对区内泥石流危害性进行分区。研究表明:水泉沟坡面结构松散,山坡陡峻,在降水、地震、人类工程活动或重力作用下,会诱发泥石流;水泉沟泥石流设计重度为18.7 kN/m^(3),年冲出量为1.24×10^(4) m^(3)/a,泥石流一次最大冲出量为0.66×10^(4) m^(3),泥石流最大冲压力190.22 kN,泥石流最大爬高为6.2 m;极危险区为水泉沟沟口至白龙江岸边,面积为0.13 km^(2),占区内总面积的9.8%,严重危害水泉新村、313省道以及峰迭新区。建议在主沟中、下游沟道内布置两座重力式浆砌石谷坊坝,堆积扇沟道内布置一座重力式浆砌石谷坊坝,建设894 m排导堤。研究成果可为甘肃区域泥石流防治提供参考。
In order to explore the formation cause of the debris flow in Zhouqu County of Gansu Province,and protect the safety of people's lives and property,the authors took the detris flow in Shuiquangou watershed of Zhouqu County as the research object.The regional survey,ground investigation and underground exploration methods were used to ascertain the characteristics of debris flow and analyze its formation cause,on the basis of geological environment conditions investigation and analyzation in the study area.Besides,the dangerous area of the debris flow was divided.The results show that the loose slope structure and steep slope could induce debris flow under the action of precipitation,earthquake,engineering activity or gravity.The design gravity of the debris flow in Shuiquangou is 18.7 kN/m^(3),and the annual discharge is 1.24×10^(4) m^(3)/a.The maximum discharge of the debris flow is 0.66×10^(4) m^(3) and the maximum pressure of the debris flow is 190.22 kN,with maximum climbing height of 6.2 m.Extreme dangerous area is distributed from Shuiquangou estuary to Bailongjiang river bank,with the area of 0.13 km^(2),accounting for 9.8%of the total area,which has worst effects on Shuiquanxincun,313 provincial road and Fengdie area.It is suggested that two gravity-grouted Shigufang dams should be arranged in the middle and lower reaches of the main ditch,and one should be arranged in the alluvial fan ditch,with a 894-meter-long drainage dam.This research could provide some reference for the debris flow prevention in Gansu Province.
作者
丁旭强
DING Xuqiang(Lanzhou Bowen University of Science and Technology,Gansu Lanzhou 730100,China)
出处
《中国地质调查》
CAS
2024年第2期90-96,共7页
Geological Survey of China
关键词
舟曲县
泥石流
成因
勘察
Zhouqu County
debris flow
cause
investigation
