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Author(s):: HU Xiong-lin; YANG Run-hai; ZHANG Jian-guo; ZHENG Ding-chang; (Earthquake Administration of Yunnan Province; Kunming 650224,Yunnan,China);

摘要:: 系统收集整理昆明盆地238个钻孔资料,根据《建筑抗震设计规范》(GB50011-2001)中砂土液化的判别方法,对其中81个钻孔进行了液化判别和等级划分。结果显示,昆明盆地地形平坦,由北向南高程渐低,自然坡降为1‰～2‰,地层由第四纪的冲积、湖积及湖沼相沉积之砂质粘土、淤泥、草煤及粉砂组成,其液化判定结果与盆地地貌和沉积物的分布规律一致。在Ⅷ度以上地震烈度影响下,滇池北岸到昆明机场的范围内存在砂土液化的可能。

Abstract:: We systematically collect the data of 238 boreholes in Kunming Basin.We also discriminate standard of sand liquefaction and divide the degree of sand liquefaction on the Kunming Basin,based on the Sand liquefaction method of "code for seismic design of buildings(GB50011-2001)".The results show that,the flat terrain of Kunming Basin gradually from north to south elevation is low and its the natural gradient is 1 ‰ -2 ‰.The formation of Kunming Basin make up of limnology clay,mud,grass coal and silt composition of the Quaternary alluvial and lacustrine facies of the sandy,its liquefied results is consistent with the law of the distribution of landforms and sediments.Within the northern bank of Dianchi Lake to Kunming Airport,there are potential possibility of soil liquefaction on degrees or higher Ⅷ seismic intensity.