摘要
昆明巫家坝地处滇池流域,部分地区其第四系土层厚度超过百米,含有多层泥炭质土及软弱层,常规静力触探手段无法满足要求,严重制约昆明地区建筑基坑与基础设计。为解决这个问题,通过改进静力触探试验方法,对场地90 m深度内土层进行超深静力触探测试,结合室内土工实验结果,对比静探数据与钻孔数据,结果表明:(1)静探反映的地层信息与现场钻探获得的土层信息基本一致,且与周边类似项目数据吻合。通过分析数据发现:(2)地表10 m深度以内的地层,受以往工程活动影响,静力触探侧摩阻力较经验值偏大;(3)深度90 m以内地层的侧摩阻力随深度增加而增加;(4)泥炭质土与粉土常相伴出现,结合各类土层地质成因分析,此特征是滇池水位变化引起的。
Wujiaba in Kunming is located in the Dianchi lake basin.In some areas,its quaternary layer is more than 100 meters thick,which contains multiple layers of peat soft interlayer.This seriously restricts the design of foundation pit and foundation.In order to solve this problem,an ultra-deep static contact detection test was carried out on the soil layer at a depth of 90 meters in the site by improving the static contact test method.Combined with the results of indoor geotechnical experiment,the data of static exploration and borehole were compared.The results show that:(1)The formation information reflected by static exploration is basically consistent with that obtained by field drilling,and the data is consistent with the data of surrounding projects;(2)Under the influence of previous engineering activities,the empirical value of lateral friction resistance and friction resistance of static contact is relatively large for strata within 10 m depth of the surface;(3)Soil depth within 90 m,the lateral friction resistance increases with the depth;(4)Peat soil and silt often appear together.Combined with the soil formations,such characteristic is caused by the change of water level in Dianchi Lake.
作者
丁溪泉
刘海军
郭晓霞
王新
刘兴国
DING Xi-quan;LIU Hai-jun;GUO Xiao-xia;WANG Xin;LIU Xing-guo(China Southwest Geotechnical Investigation&Design Institute Co.,Ltd,Chongqing 401121,China;Faculty of Vehicle Engineering and Mechanics,Dalian University of Technology,Dalian 116000,Liaoning,China)
出处
《贵州地质》
2022年第2期174-180,共7页
Guizhou Geology
关键词
超深静力触探
侧摩阻力
泥炭质土
粉土
地层划分
昆明
Ultra-deep cone penetration test
Lateral friction resistance
Peat soil
Silt
Stratigraphic classification
Kunming
