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蜂桶岩泥石流是汶川地震灾区都江堰市龙池镇2010年“8.13”泥石流灾害中的新增灾害点之一。以野外调查资料和室内实验数据为基础,分析了蜂桶岩泥石流的成灾条件、过程及特征。蜂桶岩沟流域内地震产生的部分松散固体物质在降水带动下向沟下游流动,侵蚀地表形成洪水沟。在8月13日的强降雨作用下,大量坡体上的松散固体物质随水流汇集到洪水沟,与沟道内的松散堆积物质一起迅速向下流动形成泥石流。激发蜂桶岩泥石流的1h降雨量为53.8mm,8月13日全天总降雨量为209.8mm,降雨频率约为十年一遇。“8.13”蜂桶岩泥石流容重为2.0g/cm3,泥石流屈服应力为4999Pa,洪峰流量为104m3/s,冲出物总体积为7.4×104 m3。蜂桶岩沟在发生“8.13”泥石流后沟道深切,流域内还存有松散固体物源,具备再次发生泥石流的条件,沟口区域不再适宜作为居民建设用地。
Bee barrel rock debris flow is Wenchuan earthquake Dujiangyan City, Longchi Town in 2010 “8.13 ” debris flow disaster in the new one of the disaster. Based on the field survey data and indoor experimental data, the disastrous conditions, process and characteristics of the debris flow in the bee barrel were analyzed. Part of the loose solid material produced by the earthquake in the bee rock ditch watershed flows downstream and downstream of the ditch under the influence of precipitation and erodes the surface to form a flood ditch. Under the heavy rainfall on August 13, a large amount of loose solid matter on the slope converges to the flood ditch with the water flow, and flows rapidly downwards together with loosely accumulated material in the ditch to form a debris flow. The 1h rainfall that triggered the bee debris flow was 53.8mm. On August 13, the total rainfall for the whole day was 209.8mm. The rainfall frequency was about 10 years. “8.13 ” bucket rock debris flow capacity of 2.0g / cm3, debris flow yield stress of 4999Pa, peak flow of 104m3 / s, the total volume of 7.4 × 104 m3 effluent. After the occurrence of the “8.13” debris flow in the beehive rock ditch, the channel is deep and there are still loose solid sources in the watershed, which has the condition of debris flow re-occurring. The Mizoguchi area is no longer suitable for residential construction.