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海城(1975)、唐山(1976)地震调查中,发现大量粉质壤土或轻亚粘土产生了液化破坏,现场和室内的很多试验研究结果说明随粘粒(<0.005毫米)含量增加,液化的可能性也随之降低,粘粒含量超过12％时发生液化破坏的很少。 二滩水利枢纽工程的地震烈度为7度,按8度设防。上下游围堰地基的第一层属块石夹砂卵石,饱和容重Υm=2.1克/厘米~3;第二层为砂砾卵石夹砂,饱和容重Υm=2.18克/厘米~3,有的地方没有第二层,即第一层的下面就是此次试验的粉质粘土。该层土离地面最浅的约9.65米,最深约30米,需论证在8度地震情况下的液化势。
In the seismic survey of Haicheng (1975) and Tangshan (1976), a large amount of silty loam or light-loamy clay was found to have liquefaction damage. Many experimental studies at the site and in the laboratory showed that as the amount of clay (<0.005 mm) The possibility is also reduced, the liquefaction damage occurred when the clay content exceeds 12%. Ertan Hydropower Project earthquake intensity of 7 degrees, according to 8 degrees fortification. The first layer of the foundation of the upstream and downstream cofferdam sandstone gravel sandstone, saturated bulk density Υm = 2.1 g / cm ~ 3; the second layer of gravel pebble sand, saturated bulk density Ym = 2.18 g / cm ~ 3, in some places No second layer, below the first layer, is the silty clay of this experiment. This layer of soil is the lightest from the ground about 9.65 meters, the deepest about 30 meters, to prove the liquefaction potential in the case of 8 degree earthquake.