Seeing the disorder of the division standards of engineering geological strata,this situation is not conducive to the communication and socialization of engineering geological data.In order to improve the universal of engineering geological data,taking the engineering geological 100m strata as the object combined with 11 a 1 ∶ 50000 standard sheet engineering geological survey work in the study area.Considering sedimentary age,sedimentary environment,soil structure characteristics and physical and mechanical parameters,the engineering geological 100m strata were divided into 7 engineering geology strata and 21 layers,and were given the basic sequence stratigraphic structure and coding.Through the establishment of engineering geological layer group,the corresponding relationship is found out between drilling and soil layer of large area engineering.It makes the contrast analysis of regional stratigraphic data potentially.It helps to geological model of generalized and seizes the engineering geological problems.It analysed the group rationality of engineering geological layer through parameters of the discrete analysis,geological profile drawing and the establishment of three-dimensional model.It is confirmed that the result of layer group division is reasonable and correct.Through the establishment of the engineering geological strata groups,it found out the two sensitive preferred strata and four dominant bearing strata.The results has a certain guiding significance to engineering investigation,urban planning and construction project location demonstration in the north of the Yangtze river delta region.%鉴于研究区工程地质层划分标准尚不统一,不利于工程地质资料的交流和资料的社会化利用.为提高研究区工程地质资料的通用性,结合研究区11个1∶50000标准图幅工程地质调查工作,以1OOm以浅的土体为工程地质层组划分对象,考虑沉积时代、沉积环境、土体结构特征和物理力学参数,建立研究区基本地层结构层序和编码,将研究区土体划分为7个工程地质层组和21个工程地质层.通过工程地质层组的建立,找出了大区域工程钻孔土层的对应关系,使区域地层资料对比分析成为可能,有助于地质模型的概化和抓住工程地质问题.采用物理力学参数离散性、绘制的地质剖面和三维型分析了工程地质层组划分的合理性,证实了层组划分结果合理正确.通过工程地质层组划分,找出了2个软弱敏感层和4个优势持力层.本文的成果对长江北岸三角洲地区的工程勘察、城市规划和建设项目选址论证具有一定的指导意义.
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