四川青川县碾子崩塌风险性评价
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摘要
2008年5月12日四川省发生8级地震,地震对青川县造成了巨大破坏,同时引发了大量的次生地质灾害。本文以碾子村五社崩塌灾害点为研究评价对象,在工程地质条件、危岩体分布特征、变形破坏模式的研究基础之上,计算了研究区典型危岩体的稳定性及破坏概率。在野外滚石实验的基础上,运用专业软件模拟了失稳块石的运动轨迹,得到了落石运动过程中的速度、跳高及动能,并进一步确定了崩塌的影响范围。在野外调查和收集当地社会经济资料的基础上,对崩塌的易损性及风险性进行了评价,并根据灾害特点及评价结果提出了相应的防灾减灾措施。
Sichuan province suffered magnitude 8 earthquake on May 12,2008.The earthquake severely devastated the Qingchuan County,and triggered a large number of secondary geological disasters at the same time.The paper's study and evaluate objects is the rockfall disaster in the No.five village of NianZi.Based on the study of the engineering geological conditions,the distribution of the dangerous rock body,the failure and variabile modes,calculated the dangerous rock's stability and probability of failure.Based on the test of rolling stones,simulated the motion trajectories of falling rocks in using professional software,then obtained the falling rock's speed,jumping height,kinetic energy and the influence scope is delineated also.Vulnerability and risk assessment of the disaster have been developed acaccording to the field investigation and local social economic data.Appropriate measures for the disaster prevention and mitigation have been proposed according to the hazards characteristics and the results of evaluation.
Sichuan province suffered magnitude 8 earthquake on May 12,2008.The earthquake severely devastated the Qingchuan County,and triggered a large number of secondary geological disasters at the same time.The paper's study and evaluate objects is the rockfall disaster in the No.five village of NianZi.Based on the study of the engineering geological conditions,the distribution of the dangerous rock body,the failure and variabile modes,calculated the dangerous rock's stability and probability of failure.Based on the test of rolling stones,simulated the motion trajectories of falling rocks in using professional software,then obtained the falling rock's speed,jumping height,kinetic energy and the influence scope is delineated also.Vulnerability and risk assessment of the disaster have been developed acaccording to the field investigation and local social economic data.Appropriate measures for the disaster prevention and mitigation have been proposed according to the hazards characteristics and the results of evaluation.
引文
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[4]三峡库区地质灾害防治工作指挥部.三峡库区崩塌滑坡与塌岸地质灾害防治工程地质勘查技术要求[S].2004:67-68.Prevention of geological disasters in gorges reservoir areaheadquarters geological exploration technical requirementsof the geological disasters prevention project of collapse,landslide and bank collapse in the Three Gorges Reservoir[S].2004:67-68.
[5]许强,陈伟.单体危岩崩塌灾害风险评价方法—以四川省丹巴县危岩崩塌体为例[J].地质通报,2009,28(8):1039—1046.XU Qiang,CHEN Wei.Risk assessment method for singlerockfall geo-disaster:a case study on the rockfall in DanbaCounty[J].Geological Bulletin of China,2009,28(8):1039-1046.
[2]罗元华.地质灾害风险评估方法[M].北京:地质出版社,1998.LUO Yuanhua.The risk evaluation methods of geologicaldisaster[M].Beijing:Geological Publishing House,1998.
[3]张延辉.延安凤凰山滑坡灾害风险性研究[D].西安:长安大学,2008.ZHANG Yanhui.Landslide risk research of Fenghuangmountain in Yan’an[D].Xi An:Chang'an University,2008.
[4]三峡库区地质灾害防治工作指挥部.三峡库区崩塌滑坡与塌岸地质灾害防治工程地质勘查技术要求[S].2004:67-68.Prevention of geological disasters in gorges reservoir areaheadquarters geological exploration technical requirementsof the geological disasters prevention project of collapse,landslide and bank collapse in the Three Gorges Reservoir[S].2004:67-68.
[5]许强,陈伟.单体危岩崩塌灾害风险评价方法—以四川省丹巴县危岩崩塌体为例[J].地质通报,2009,28(8):1039—1046.XU Qiang,CHEN Wei.Risk assessment method for singlerockfall geo-disaster:a case study on the rockfall in DanbaCounty[J].Geological Bulletin of China,2009,28(8):1039-1046.
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