地震研究

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。

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.

引言
1 原理
2 昆明盆地钻孔液化砂土层的物理特性
3 结果
4 结论与讨论

图1 钻孔平面位置图<br/>Fig.1 Borehole location map

图1 钻孔平面位置图
Fig.1 Borehole location map

表1 液化土特征深度判断表<br/>Tab.1 Characteristics depth table of liquefied soil

表1 液化土特征深度判断表
Tab.1 Characteristics depth table of liquefied soil

表2 标准贯入锤击数基准值<br/>Tab.2 Number of SPT hammer the reference value

表2 标准贯入锤击数基准值
Tab.2 Number of SPT hammer the reference value

表3 液化等级判断表<br/>Tab.3 Liquid level determination table

表3 液化等级判断表
Tab.3 Liquid level determination table

表4 可能液化砂土层物理参数<br/>Tab.4 Physical parameters of liquefied sand layer

表4 可能液化砂土层物理参数
Tab.4 Physical parameters of liquefied sand layer

表5 各孔粒度成分<br/>Tab.5 Composition of pore size

表5 各孔粒度成分
Tab.5 Composition of pore size

表6 液化判断结果表<br/>Tab.6 The outcome of liquefied judge

表6 液化判断结果表
Tab.6 The outcome of liquefied judge

图2 液化等级平面分布图<br/>Fig.2 Distribution of liquefied level plane

图2 液化等级平面分布图
Fig.2 Distribution of liquefied level plane

阮永芬,候克鹏.2000.粉土地震液化判别方法研究的现状和实际存在的问题[J].昆明理工大学学报,25(1):64-67.
石兆吉.1993.土壤液化势的剪切波速判别法[J].岩土工程学报,(1):74-80.
石兆吉.1997.砂土液化判别和评价综合方法研究[J].地震工程与工程振动,(1):82-88.
汪闻韶.1984.关于饱和砂土液化机理和判别方法的某些探讨[M].北京:水利电力出版社.
谢定义.1992.饱和砂土液化的若干问题[J].岩土工程学报,14(3):45-50.
GB50011-2001,建筑抗震设计规范[S].
GBJ11-1989,建筑抗震设计规范[S].
TJ11-74,工业与民用建筑抗震设计规范[S].
Huang W X.1961.Investigation on stability of saturated sand foundations and slopes against Liquefaction[J].In:Proceedings of the fifth International Conference of Soil Mechanics and Foundation Engineering,2:629～631.
Seed H B,Idriss.1981.Evaluation of liquefaction potential of sand deposits based on observation of performance in previous earthquake[J].insitu testing to evaluate liquefaction susceptibility susceptibility,session,ASCE Nationa convention,(24):206-210.

备注

引言

1 原理

2 昆明盆地钻孔液化砂土层的物理特性

3 结果

4 结论与讨论

期刊信息