广元市次生地质灾害分布特征及影响因素分析——以朝天区为例
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摘要
四川省广元市朝天区是汶川8.0级地震的重灾区之一,由地震触发的崩塌、滑坡等次生地质灾害对人民群众生命财产安全构成巨大威胁。基于实地调查,对震后地质灾害隐患点进行了统计分析,指出了地震地质灾害的分布特征,并对其影响因素进行了深入分析。区内地震地质灾害点多分布在海拔800 m以上的陡坡或陡崖部位,并沿龙门山断裂带、嘉陵江水系及交通路线呈线状或带状分布。地震地质灾害的发生是内外力共同作用结果,其中地震力和断裂构造带对地质灾害发生起着决定性的作用,而地层岩性对灾种起关键性的作用,滑坡多发育在页岩、片岩、板岩、千枚岩等软岩分布区,崩塌多发育在灰岩、砂岩等硬岩分布区。
Chaotian district of Guangyuan city is one of heavy disaster areas in Wenchuan earthquake.Rock collapses,landslides,debris flows and other geohazards triggered by Wenchuan earthquake,seriously threatened people lives and properties.Based on field survey in Chaotian district,statistical analysis of the points with hidden geohazards is made.The distribution characteristics of seismogeological disasters and their influencing factors are analyzed.The seismogeological hazard sites mainly distributed on steep slopes or cliffs at altitudes of over 800 meters in linear or zonal patterns along Longmen fault zone,Jialing River and traffic lines.Seismogeological disasters are the results of joint action of internal and external forces.Faults and seismic force play a decisive role,while stratum lithology determined the types of disasters.Most landslides developed in the area of soft rock,such as shale,schist,slate and phyllite,and most collapses developed in the area of hard rock,like limestone and sandstone.
Chaotian district of Guangyuan city is one of heavy disaster areas in Wenchuan earthquake.Rock collapses,landslides,debris flows and other geohazards triggered by Wenchuan earthquake,seriously threatened people lives and properties.Based on field survey in Chaotian district,statistical analysis of the points with hidden geohazards is made.The distribution characteristics of seismogeological disasters and their influencing factors are analyzed.The seismogeological hazard sites mainly distributed on steep slopes or cliffs at altitudes of over 800 meters in linear or zonal patterns along Longmen fault zone,Jialing River and traffic lines.Seismogeological disasters are the results of joint action of internal and external forces.Faults and seismic force play a decisive role,while stratum lithology determined the types of disasters.Most landslides developed in the area of soft rock,such as shale,schist,slate and phyllite,and most collapses developed in the area of hard rock,like limestone and sandstone.
引文
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[2]陈国光,计凤桔,周荣军,等.龙门山断裂带晚第四纪活动性分段的初步研究[J].地震地质,2007,29(3):657-673.
[3]崔芳鹏,胡瑞林,殷跃平,等.地震纵横波时差耦合作用的斜坡崩滑效应研究[J].工程地质学报,2009,17(4):455-463.
[4]韩金良,吴树仁,何淑军,等.5.12汶川8级地震次生地质灾害基本特征及其形成机制浅析[J].地学前缘,2009,16(3):306-326.
[5]李传友,宋方敏,冉勇康.龙门山断裂带北段第四纪活动性讨论[J].地震地质,2004,26(2):248-258.
[6]马杏垣.中国岩石圈动力学地图集[M].北京:中国地图出版社,1989.
[7]彭华,马秀敏,姜景捷.龙门山北端青川断层附近应力测量与断层稳定性[J].地质力学学报,2009,15(2):114-130.
[8]任俊杰,张世民.汶川8级地震地表破裂带特征及其构造意义[J].大地测量与地球动力学,2008,28(6):47-67.
[9]四川省地质局第二区域地质测量队.中华人民共和国区域地质调查报告广元幅(1:20万)[M].北京:地质出版社,1966.
[10]四川省地质矿产局.四川省区域地质志[M].北京:地质出版社,1991.
[11]谢洪,钟敦伦,矫震,等.2008年汶川地震重灾区的泥石流[J].山地学报,2009,27(4):501-509.
[12]殷跃平.汶川八级地震地质灾害研究[J].工程地质学报,2008,16(4):433-444.
[13]杨泰平,唐川,齐信.基于G IS技术的汶川8.0级地震诱发地质灾害危险性评价——以四川省安县为例[J].灾害学,2009,24(4):68-72.
[14]周荣军,黄润秋,雷建成,等.四川汶川8.0地震地表破裂与震害特点[J].岩石力学与工程学报,2008,27(11):2173-2183.
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