摘要
5.12汶川8.0级地震后,引发了大规模的震后灾害,绵竹市清平乡芍药沟在地震影响下,先后发生了3次大规模的突发泥石流,对流域沟口处的二级电站厂房威胁较大,且相关人员的安全也受此影响。本文在野外调查的基础上,利用单沟泥石流法对芍药沟泥石流进行研究分析,以确定泥石流的危险程度等级。研究发现:区内总物源量达16.84万m^(3),沟内启动物源量为5.28万m^(3),一旦遭到大暴雨的作用,可能发生强度较大的泥石流。区域地质灾害主要为泥石流灾害,其流域范围分布在二级电站厂房南侧,物源主要以崩塌、滑坡以及失稳体为主;芍药沟泥石流主要为暴雨沟谷型粘性泥石流,危险性中等;地质灾害中等发育,泥石流沟的危险区面积约1.48km^(2);目前芍药沟泥石流处于发展阶段-发展期(壮年期),同时流域内的地质构造、地貌特征以及区域降雨为泥石流的形成提供较好的物源与动力基础。综上评价,芍药沟泥石流为中度危险。
After 5·12 Wenchuan 8.0 earthquake, a large-scale post-earthquake disasters were triggered. Under the influence of the earthquake, shaoyaogou, Qingping Township, Mianzhu City, had three large-scale sudden debris flows, which threatened the power house of the second-class power station at the outlet of the river basin,and the safety of relevant personnel was also affected. Based on the field investigation, this paper studies and analyzes the debris flow of Shaoyaogou by using the method of single gully debris flow to determine the risk level of debris flow. It is found that the total amount of material sources in the area is 168400m^(3), and the amount of starting material sources in the gully is 52800m^(3). Once heavy rain occurs, debris flow with high intensity may occur. The regional geological hazards are mainly debris flow hazards, with the drainage area distributed in the south of the power house of the second level power station, and the main sources are collapse,landslide and unstable body;the debris flow in Shaoyaogou is mainly rainstorm gully type viscous debris flow,with medium risk;the geological hazards are moderately developed with the hazard area of debris flow gully of about 1.48km^(2);at present, the debris flow in Shaoyaogou is in the development stage(prime).At the same time,the geological structure, geomorphic characteristics and regional rainfall provide a better material source and dynamic basis for the formation of debris flow. To sum up, the debris flow in Shaoyaogou is of moderate risk.
作者
辛聪聪
毛永星
喻文亮
Xin Congcong;Mao Yongxing;Yu Wenliang(Anhui Branch of CCRI,Hefei,Anhui,230000,China;The Fifth Geological Brigade of Jiangxi Bureau of Geology,Xinyu,Jiangxi,338000,China;Xinda Geological Disaster Prevention and Control Research Institute of Jiangxi Province,Xinyu,Jiangxi,338000,China)
出处
《化工矿产地质》
CAS
2022年第1期64-71,共8页
Geology of Chemical Minerals
基金
绵竹市清平乡小木岭二级站厂房地质灾害危险性评估报告。
关键词
芍药沟
泥石流
风险评估
形成条件
Shaoyaogou
Debris flow
Risk assessment
Formation conditions
