天津市大直沽位市区东南,是地下水开采悠久,地面沉降较严重的地区之一。为查清本区水文地质工程地质结构,控制地面沉降的继续发展,研究了第四系的沉积环境。 研究深度大都在200米以上,对5个钻孔中的186个样品的粒度资料,分别用正态概率图,因子分析和 Tianjin City, located in the southeast of the city, is a long groundwater exploitation, land subsidence is more serious one of the areas. In order to find out the geologic structure of hydrogeology engineering in this area and control the continuous development of land subsidence, the sedimentary environment of Quaternary was studied. Most of the depth of research is more than 200 meters. The particle size data of 186 samples from 5 boreholes are respectively analyzed by normal probability graph, factor analysis and