四川省青川县碾子村清岭沟泥石流特征及防灾对策
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摘要
清岭沟位于四川省青川县碾子村五社,该区工程地质条件复杂。"5.12"地震后沟内出现大量崩塌落石和松散堆积物,为泥石流的爆发提供了充足的物源,2008年8月清岭沟地区发生连续强降雨,8月25日清岭沟爆发了泥石流。目前沟源及沟道两侧发育一处规模较大的潜在不稳定斜坡、三处规模较大的危岩体、一处形成于"5.12"地震期间的崩塌堆积物,一旦遭遇暴雨等不良地质作用这些潜在物源极易失稳,成为清岭沟泥石流的物源,使清岭沟再次发生泥石流灾害,威胁清岭沟下游村落及公路。通过野外对清岭沟进行地质调查、室内试验和动力学特征分析提出了UX—150型泥石流栅栏、拦砂坝、排导槽和桥涵改造的综合治理措施。
The Qingling Ditch is located in Five Community of Nianzi village,Qingchuan County of Sichuan Province,where there are complex geological conditions.After"5.12"earthquake,a large number of Collapse rockfalls and loose solid substances appeared in the trench,which provides a sufficient source for the break-out of debris flow.Continuous heavy rainfalls occurred in QingLing ditch region in August 2008.Then,the debris flow break out in QingLing ditch on August 25.At the origin of the Qingling Ditch and both sides of the trench,there developed a large potential unstable slope,three large-scale dangerous rockmass,and one which formed in the"5.12"earthquake collapse deposits at present.In the event of heavy rain and other adverse geological processes,the potential source will be prone to landslide,and thus become the source of the Qingling Ditch.The Qingling Ditch,would break out debris flow again.The village and road downstream the QingLing ditch will be threatened at the same time.Through the field investigation,laboratory tests and dynamics character analysis,we propose a comprehensive management from UX— 150 type debris flow fence,dam,drainage trough and culvert reconstruction.
The Qingling Ditch is located in Five Community of Nianzi village,Qingchuan County of Sichuan Province,where there are complex geological conditions.After"5.12"earthquake,a large number of Collapse rockfalls and loose solid substances appeared in the trench,which provides a sufficient source for the break-out of debris flow.Continuous heavy rainfalls occurred in QingLing ditch region in August 2008.Then,the debris flow break out in QingLing ditch on August 25.At the origin of the Qingling Ditch and both sides of the trench,there developed a large potential unstable slope,three large-scale dangerous rockmass,and one which formed in the"5.12"earthquake collapse deposits at present.In the event of heavy rain and other adverse geological processes,the potential source will be prone to landslide,and thus become the source of the Qingling Ditch.The Qingling Ditch,would break out debris flow again.The village and road downstream the QingLing ditch will be threatened at the same time.Through the field investigation,laboratory tests and dynamics character analysis,we propose a comprehensive management from UX— 150 type debris flow fence,dam,drainage trough and culvert reconstruction.
引文
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[7]DZ/T 0220-2006泥石流灾害防治工程勘查规范[S].DZ/T 0220-2006,Reconnaissance standard ontreatment to the disaster debris flow[S].
[2]吴平,郑文晓.泥石流的形成条件及其防治措施[J].西部探矿工程,2008,(3):4-5.WU Ping,ZHEN Wenxiao.Formating condition andcontrol on debris flows[J].West-China ExplorationEngineering,2008,(3):4-5.
[3]唐川,铁永波.汶川震区北川县城魏家沟暴雨泥石流灾害调查分析[J].山地学报,2009,27(5):625-630.TANG Chuan,TIE Yongbo.Reconnaissance and analysison the rain storm induced debris flow in Weijiagou valleyof Beichuan city after the Wenchuan earthquake[J].Journal of mountain science,2009,27(5):625-630.
[4]唐川,梁京涛.汶川震区北川9.24暴雨泥石流特征研究[J].工程地质学报,2008,16(6):0751-0758.TANG Chun,LIANG Jingtao.Characterics of debris flowsin Beichuan epicenter of the Wenchuan earthquaketriggered by rainstorm on September 24,2008[J].Journalof Engineering Geology,2008,16(6):0751-0758.
[5]Lin C W et al.Impact of Chi-Chi earthquake on theoccurrence of landslides and debris flows:example fromthe Chenyulan River Watershed,Nantou,Taiwan[J].Engineering Geology,2003,71(2):65-67.
[6]唐川.汶川地震区暴雨滑坡泥石流活动趋势预测[J].山地学报,2010,26(3):56-63.TANG Chuan.Trending forecast.on the rainstorminduced landslide and debris flow in the Wenchuanearthquake area[J].Journal of Mountain Research,2010,26(3):56-63.
[7]DZ/T 0220-2006泥石流灾害防治工程勘查规范[S].DZ/T 0220-2006,Reconnaissance standard ontreatment to the disaster debris flow[S].
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