胜利—果园村液化带工程地质条件及液化土层特性分析
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摘要
砂土液化是地震主要次生地质灾害之一,其是否发生及液化程度如何与地层结构、地下水、土层类型及特征等工程地质条件密切相关,通常饱和砂土和饱和粉土容易发生液化。5.12汶川地震中,在以砾石为主要地层的德阳等地发生了严重的砂土液化现象,这在以往地震中少见。胜利—果园村液化带是德阳地区诸多典型液化带之一,通过现场钻探和试验表明:液化带主要土层为砾石和粘土,发生液化的土层为全新统砾石层;液化砾石层结构松散,颗粒大小分布曲线较平缓,平均粒径和不均匀系数较大,曲率系数较小;地面喷出物是粗砂,其颗粒组成与液化砾石层相差很大。
The liquefaction of sand which is one of main geological hazards during earthquake is closely related to engineering geological conditions such as the layer structure, groundwater, types and characteristics of soil. Usually the saturated sand and the saturated silt are easier to liquefaction. On May 12,2008 Wenchuan earthquake,the liquefaction of sand was discovered in Deyang region where gravel was widely distributed,which occurred unusually in the past earthquake. Shengli-Guoyuan liquefaction zone was one of the many typical liquefaction zones in Deyang. The engineering geological drilling and tests had been done in the area. The results indicated that gravel and clay were the main soils in Deyang,and the Holocene gravel was the liquefaction soil layer; the liquefied gravel layer was of the loose structure and the grain-size distribution curves are flat,the mean size and the uniformity coefficient were large and the curvature coefficient was small; The ejecta from the ground was coarse sand,and the grain-size distribution of the sand was different from that of the liquefied gravel.
The liquefaction of sand which is one of main geological hazards during earthquake is closely related to engineering geological conditions such as the layer structure, groundwater, types and characteristics of soil. Usually the saturated sand and the saturated silt are easier to liquefaction. On May 12,2008 Wenchuan earthquake,the liquefaction of sand was discovered in Deyang region where gravel was widely distributed,which occurred unusually in the past earthquake. Shengli-Guoyuan liquefaction zone was one of the many typical liquefaction zones in Deyang. The engineering geological drilling and tests had been done in the area. The results indicated that gravel and clay were the main soils in Deyang,and the Holocene gravel was the liquefaction soil layer; the liquefied gravel layer was of the loose structure and the grain-size distribution curves are flat,the mean size and the uniformity coefficient were large and the curvature coefficient was small; The ejecta from the ground was coarse sand,and the grain-size distribution of the sand was different from that of the liquefied gravel.
引文
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[3]刘惠珊.1995年阪神大地震的液化特点[J].工程抗震,2001,(1):22～26.又见杨克己,韩理安.桩基工程[M].北京:人民交通出版社,1992.
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[5]任红梅,吕西林,李培振.饱和砂土液化研究进展.地震工程与工程振动,2007,27(6):166～174.
[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].岩土力学与工程学报,2009,28(6):1288～1296.
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