5.12地震中德阳旌阳区地震液化特征
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摘要
针对目前对汶川8.0级地震产生的地震液化现象认识较少的情况,通过较详尽的现场调查以及收集相关地震、水文及地质资料,讨论汶川地震德阳市旌阳区地震液化分布及其特征问题。研究结果表明本次地震液化具有如下特点:(1)液化范围广,但分布不均匀,液化危害程度差距较大,液化的强弱受震动强度、水文及地质条件的影响;(2)地震液化的分布与区域水文地质条件、工程地质条件呈良好的对应关系;(3)地震液化与地裂缝有伴生性,且地裂缝与河流方向相近;(4)砂砾石层液化是本次地震液化的主要特征,是以往地震没有发现的现象。
For the current 8.0 magnitude earthquake generated seismic liquefaction phenomenon there is few understanding of the situation,through more detailed field investigation and collection of seismic,hydrological and geological data,a discussion of the earthquake liquefaction distribution in Deyang Jingyang area and characteristics of liquefaction is carried out.The results show that the earthquake liquefaction has the following characteristics:(1 ) liquefaction is in a wide range,but the distribution is uneven,a big gap is in level of liquefaction hazard,the liquefaction intensity is affected by vibration intensity,hydrological and geological conditions.(2) liquefaction distribution shows good correspondence with the regional hydrogeological and geological conditions.(3) liquefaction is associated with ground cracks,and the direction of crack is close to that of rivers,(4) liquefied sand and gravel layer is the main feature of this earthquake liquefaction,which was not found in the past.
For the current 8.0 magnitude earthquake generated seismic liquefaction phenomenon there is few understanding of the situation,through more detailed field investigation and collection of seismic,hydrological and geological data,a discussion of the earthquake liquefaction distribution in Deyang Jingyang area and characteristics of liquefaction is carried out.The results show that the earthquake liquefaction has the following characteristics:(1 ) liquefaction is in a wide range,but the distribution is uneven,a big gap is in level of liquefaction hazard,the liquefaction intensity is affected by vibration intensity,hydrological and geological conditions.(2) liquefaction distribution shows good correspondence with the regional hydrogeological and geological conditions.(3) liquefaction is associated with ground cracks,and the direction of crack is close to that of rivers,(4) liquefied sand and gravel layer is the main feature of this earthquake liquefaction,which was not found in the past.
引文
[1]易中军,王敬林,张顺斌,等.四川省5.12地震灾区德阳市旌阳区地质灾害应急排查总结报告[R].2008.
[2]刘惠珊.1995年阪神大地震的液化特点[J].工程抗震,2001,(1):22-26.
[3]中华人民共和国国家标准编写组.GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[4]范士凯,粟怡然.砂土液化的工程地质判别法[J].资源环境与工程,2006,20(增1):595-600.
[5]刘小丽,刘红军,贾永刚.黄河三角洲饱和粉土层地震液化判别方法及液化特征研究[J].岩石力学与工程学报,2007,26(增1):2 981-2 987.
[6]袁晓铭,曹振中,孙锐,等.汶川8.0级地震液化特征初步研究[J].岩石力学与工程学报,2002,21(6): 803-807.
[2]刘惠珊.1995年阪神大地震的液化特点[J].工程抗震,2001,(1):22-26.
[3]中华人民共和国国家标准编写组.GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[4]范士凯,粟怡然.砂土液化的工程地质判别法[J].资源环境与工程,2006,20(增1):595-600.
[5]刘小丽,刘红军,贾永刚.黄河三角洲饱和粉土层地震液化判别方法及液化特征研究[J].岩石力学与工程学报,2007,26(增1):2 981-2 987.
[6]袁晓铭,曹振中,孙锐,等.汶川8.0级地震液化特征初步研究[J].岩石力学与工程学报,2002,21(6): 803-807.
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