四川康定城市地震地质及地质灾害风险评价
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摘要
四川康定处于鲜水河、龙门山及安宁河三条地震带的"Y"字形交汇部位,境内地震活动频繁,地震基本烈度达IX度。康定城区位于鲜水河断裂南东段的雅拉河-康定断裂,城区几乎处于康定断裂的次级断层围限之中,断裂发育,岩体破碎,在降雨、地震和人类经济活动的影响下,地质灾害十分发育。康定城发育地质灾害25处,其中滑坡14处,崩塌3处,泥石流5处,不稳定斜坡3处。地质灾害多沿城区河流两岸斜坡和支沟分布,对城区居民的生命财产安全构成巨大的威胁,一旦发生强烈地震及其产生的次生地质灾害,将对康定城市带来灾难性的毁坏。近年来随着城镇化建设速度的加快,城市规模不断扩大,城市容量空前扩张,加之活动断裂活动性增加,城市安全风险增大,正确合理规划城市规模,科学地开展城市环境地质调查,制定有效的减灾防灾预案是确保城市安全的重要方法。
The Kangding city is situated within the Kangding fault in the southeastern part of the Xianshuihe fault,where the developed second faults and fractured rock masses may be liable to bring about abundant geological hazards triggered by rainfalls and human's economic activities.25 sites of geological hazards have been determined,including 14 landslides,3 collapses,5 debris flows and 3 potential unstable slopes within the city proper.These geological hazards tend to be scattered along the slopes of the rivers and gullies in the urban districts,and are highly threatening the safety of life and properties.As long as severe earthquakes and resulting second geological hazards take place,the city proper will be subjected to disastrous consequences.The risks of urban safety are constantly increasing due to the speeding up of the pace of urbanization construction and the increase of the fault activities in recent years.Therefore,it is imperative to put forward the rational planning of urban scales,scientific investigation of urban environments and effective steps of prevention countermeasures.
The Kangding city is situated within the Kangding fault in the southeastern part of the Xianshuihe fault,where the developed second faults and fractured rock masses may be liable to bring about abundant geological hazards triggered by rainfalls and human's economic activities.25 sites of geological hazards have been determined,including 14 landslides,3 collapses,5 debris flows and 3 potential unstable slopes within the city proper.These geological hazards tend to be scattered along the slopes of the rivers and gullies in the urban districts,and are highly threatening the safety of life and properties.As long as severe earthquakes and resulting second geological hazards take place,the city proper will be subjected to disastrous consequences.The risks of urban safety are constantly increasing due to the speeding up of the pace of urbanization construction and the increase of the fault activities in recent years.Therefore,it is imperative to put forward the rational planning of urban scales,scientific investigation of urban environments and effective steps of prevention countermeasures.
引文
[1]丁俊,倪师军,魏伦武,等.西南地区城市地质环境风险性分区评价方法[M].成都:四川科学技术出版社,2006.
[2]郑万模,周东.四川省甘孜州地质灾害特征与防灾减灾对策[J].地质灾害与环境保护,2000,11(2):102-104.
[3]唐小平,郑万模.康定白土坎滑坡特征及防治对策[J].地质灾害与环境保护,1999,10(1):29-33.
[2]郑万模,周东.四川省甘孜州地质灾害特征与防灾减灾对策[J].地质灾害与环境保护,2000,11(2):102-104.
[3]唐小平,郑万模.康定白土坎滑坡特征及防治对策[J].地质灾害与环境保护,1999,10(1):29-33.
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