溪洛渡坝区下游癞子沟泥石流发育特征及堵江可能性分析  

Characteristics of Laizigou Debris Flow and Its Possibility of Blocking Jinsha River

作　　者：陈兴长[1,2,3] 崔鹏[1] 裴来政[1,2] 庄建琦[1,2] 

机构地区：[1]中国科学院.水利部成都山地灾害与环境研究所/山地灾害与地表过程重点实验室,四川成都610041 [2]中国科学院研究生院,北京100049 [3]西南科技大学环境与资源学院,四川绵阳621010

出　　处：《灾害学》2010年第1期45-49,共5页Journal of Catastrophology

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-302);国家科技支撑计划项目(2006BAC10B04-1)

摘　　要：在野外详细调查、测绘的基础上,研究了癞子沟泥石流的特性,分析了泥石流堵江的可能性。研究结果表明,癞子沟是一条老泥石流沟,泥石流的性质为过渡—粘性,容重为1.8～2.2 t/m3,规模属大—特大型。通过计算和分析,癞子沟泥石流在区域性降雨条件下,不会堵断金沙江,但是在局地暴雨条件下,可能堵断金沙江。如果在200年一遇泥石流堵断的情况下,堵河的高度达20.11 m;500年一遇时,堵河的高度达30.39 m。堵江后不但会淹没大坝尾水出水口,而且导致沟口右岸的癞子沟碴场失稳,形成灾害链。The characteristics of debris flows in Laizigou are studied and the possibility of blocking river was analyzed based on detailed field study and survey. Results show that the gully is an old debris flow gully with characteristics of sub-viscous to viscous, bulk density of 1.8 - 2. 2 t./m3, and scale of large to oversize. From the calculation and analysis, it is concluded that debris flow of Laizigou can not block Jinsha River under the condition of regional precipitation, but it is most likely to block the River under the condition of local torrential rain. If debris flow of Laizigou totally blocks the River, the possible height of dam will reach 20. 11 m and 30. 39 m under the circumstance of a return period of 200 - year and 500 - year of debris flow, respectively. Once blocked, the backwater will not only submerge the water outlets of Xiluodu Dam but also lead to instability of Laizigou site of tunnel discard and will form disaster chains.

关 键 词：溪洛渡大坝 癞子沟 泥石流 堵江 金沙江 

分 类 号：P642.23[天文地球—工程地质学]