矮子沟泥石流影响因素及运动参数分析
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摘要
通过对矮子沟流域进行现场勘查,收集相关气象及水文等资料,获取矮子沟流域的地形地貌特征、不良地质体分布规律、地震活动等数据,结合矮子沟流域的地质条件及降雨特征,对矮子沟泥石流的影响因素进行分析,探讨矮子沟泥石流的形成过程。在此基础上选取五个典型断面结合经验公式进行运动参数的分析计算,经计算沟口处断面的泥石流的流速为7.54 m/s,流量为948.63 m3/s,此次泥石流总量为60.08万m3,这些运动参数可以为矮子沟泥石流防治方案的选择及防治工程的设计提供参考。
After the field survey in Aizi gully and relevant data collection,the data about the morphology,bad geology distribution rules and earthquake activity history in Aizi gully are obtained,and combined with the geological conditions and rainfall characteristics of the gully,the influential factors for a debris flow of the gully are analyzed,then the forming process of the debris flow of the gully is discussed.Based on the analysis mentioned above,five typical cross-sections are selected together with empirical formula so as to calculate the related dynamic parameters.Through the calculation,it is obtained that the velocity and discharge at the outlet are 7.54 m·s-1 and 948.63 m3·s-1 respectively,and the total volume of this debris flow is 60.08×104 m3.All these dynamic parameters could play an important role in the selection of prevention measures and the design of prevention projects for the debris flow of Aizi gully.
After the field survey in Aizi gully and relevant data collection,the data about the morphology,bad geology distribution rules and earthquake activity history in Aizi gully are obtained,and combined with the geological conditions and rainfall characteristics of the gully,the influential factors for a debris flow of the gully are analyzed,then the forming process of the debris flow of the gully is discussed.Based on the analysis mentioned above,five typical cross-sections are selected together with empirical formula so as to calculate the related dynamic parameters.Through the calculation,it is obtained that the velocity and discharge at the outlet are 7.54 m·s-1 and 948.63 m3·s-1 respectively,and the total volume of this debris flow is 60.08×104 m3.All these dynamic parameters could play an important role in the selection of prevention measures and the design of prevention projects for the debris flow of Aizi gully.
引文
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[14]韦方强,胡凯衡.泥石流流速研究现状与发展方向[J].山地学报,2009,27(5):545－550.
[15]陈宁生,杨成林,周伟,等.泥石流勘查技术[M].北京:科学出版社,2011.
[2]陈晓清.滑坡转化泥石流启动机理试验研究[D].成都:西南交通大学,2006.
[3]魏厚振,汪稔,胡明鉴,等.蒋家沟砾石土不同粗粒含量直剪强度特征[J].岩土力学,2008,29(1):48－51,57.
[4]杨成林,陈宁生,邓明枫,等.黏粒含量对泥石流源区砾石土体强度影响的实验研究[J].成都理工大学学报(自然科学版),2011,38(5):522－528.
[5]吴光明.泥石流物源区基岩岩性特征探讨[J].水文地质工程地质,2008,(5):110－112.
[6]Ryan H F,Legg M R,Conrad J,et al.Recent faulting inthe Gulf ofSanta Catalina:San Diego to Dana Point[J].Ge－ological Society of America Special Paper,2009,454:291－315.
[7]Lin C W,Shieh C L,Yuan B D,et al.Impact of Ch－i Chiearthquake on the occurrence of landslides and debris flows:example from the Chenyulan River watershed,Nantou,Ta－iwan[J].Engineering Geology,2004,71(1-2):49－61.
[8]Tang C,Zhu J,Li W L,et al.Rainfal－l triggered debrisflows following the Wenchuan earthquake[J].Bulletin of En－gineering Geology and the Environment,2009,68(2):187－194.
[9]屈永平,唐川,王金亮,等.强震区泥石流启动机制[J].山地学报,2012,30(3):336－341.
[10]宋继宏,胡明鉴,付克俭,等.宜巴高速岩堆不同密实度大型直剪强度特性[J].工程地质学报,2012,20(5):687－692.
[11]Chen N S,Yang C L,Zhou W,et al.The critical rainfallcharacteristics for torrents and debris flows in the Wenchuanearthquake stricken area[J].Journal of Mountain Science,2009,6(4):362－372.
[12]陈宁生,崔鹏,刘中港,等.基于黏土颗粒含量的泥石流容重计算[J].中国科学E辑技术科学,2003,33(增刊):164－174.
[13]胡明鉴,汪稔,张平仓.蒋家沟流域松散砾石土斜坡滑坡频发原因与试验模拟[J].岩石力学与工程学报,2002,21(12):1831－1834.
[14]韦方强,胡凯衡.泥石流流速研究现状与发展方向[J].山地学报,2009,27(5):545－550.
[15]陈宁生,杨成林,周伟,等.泥石流勘查技术[M].北京:科学出版社,2011.
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