汶川M_s8.0级大地震中成都地区液化特征研究
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摘要
汶川大地震中成都地区液化及其震害现象较为显著。通过现场调查和工程地质资料分析,成都地区的液化特点为:液化带主要集中都江堰市;液化在烈度Ⅵ、Ⅶ、Ⅷ、Ⅸ 和Ⅹ度区均有出现,但VII度区最为集中;液化喷水高度多在1-3m之间,最高一处超过10m;液化场地喷出物涵盖了多种土类,约67%为粉细砂,且有卵砾石,约占11%;液化带普遍伴随地裂缝,但无塌陷形成;地层以很厚的砾石和卵石层为主,其中夹杂少量砂土;虽地表喷出物以细粒土为主,但实际液化土类应为砂砾土。
In Wenchuan earthquake,the building damage due to soil liquefaction in Chengdu region was significant.By field investigation and engineering geological data analysis,the liquefaction characteristics in Chengdu region were:(1) Liquefaction zones(belts) were mainly located in Dujiangyan City;(2)The liquefaction was observed in the regions with seismic intensities VI,VII,VIII,IX and X,but mainly concentrated in the area with seismic intensity VII;(3) Heights of liquefaction water-jet were 1 to 3 m,and the highest was more than 10m;(4) The ejected materials in liquefied sites consisted of many soil types,nearly 67% of fine sand and 11% of gravel;(5) liquefaction zones were associated with cracks,but without subsiding;(6) The strata contained thick gravel and pebble layers,in which a small amount of sand mixed.Therefore,although the ejected materials were mainly fine-grained soil,the actual liquefaction material was gravel soil.
In Wenchuan earthquake,the building damage due to soil liquefaction in Chengdu region was significant.By field investigation and engineering geological data analysis,the liquefaction characteristics in Chengdu region were:(1) Liquefaction zones(belts) were mainly located in Dujiangyan City;(2)The liquefaction was observed in the regions with seismic intensities VI,VII,VIII,IX and X,but mainly concentrated in the area with seismic intensity VII;(3) Heights of liquefaction water-jet were 1 to 3 m,and the highest was more than 10m;(4) The ejected materials in liquefied sites consisted of many soil types,nearly 67% of fine sand and 11% of gravel;(5) liquefaction zones were associated with cracks,but without subsiding;(6) The strata contained thick gravel and pebble layers,in which a small amount of sand mixed.Therefore,although the ejected materials were mainly fine-grained soil,the actual liquefaction material was gravel soil.
引文
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[4]钱洪,唐荣昌.成都平原的形成与演化[J].四川地震,1997,3:1-7.
[5]何银武.论成都盆地的成生时代及其早期沉积物的一般特征[J].地质论评,1992,38(2):149-156.
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