Study On Three-dimensional Engineering Geology Structure And Suitability For Ground Engineering In Shuang Cheng City

Based on the systemic analysis of geology, geomorphology, faulted structure andhydrogeological conditions, through a large number of formation logs of engineeringgeological drilling, in-situ test data, sorting and analyzing of the experimental dataand statistics, the paper at first time establishes the standard in the engineeringgeological layers, and divides rock and soil foundation in the area. They are dividedinto45engineering geological layers, including43soil layer,2layers of rock mass.Combining formation logging and mathematical statistics, the engineering geologicallayers are described and appraised in detail and respectively.Classifying soil structure in the zone, the result shows that there is no singlestructure in the area. The multilayer structure types dominate mainly, distribute in thehigh plains and river valley plain with cohesive soil on top of it. According to thethickness of the cohesive soil, they can be subdivided into three types. Double-layerstructure types are mainly distributed in the songhua river valley plain, on the top arecohesive soil, and on the thickness of the cohesive soil they also can be subdividedinto two types.Using the software of GMS6.0and a large number of drilling data, the paperestablishes three-dimensional geological structure model in the area for the first time.The drills used in this model are all deep into cretaceous mud or sandstone; the in-situtest data and test data are complete; the model that covers all the area reflects spacedistribution of geotechnical foundation visually and vividly. The software is easy onoperation, convenient in query. This paper provides a scientific basis for foundationtype selection and the choice of bearing stratum.This paper thoroughly analyses topography characteristics, thickness anddistribution of the quaternary loose sediment, groundwater types and buried depth,rock and soil types, soil compressibility and bearing capacity of foundation structurein the area. Draws single factor maps of engineering geology series. Using themulti-factor weighted average method in rock and soil foundation, the paper evaluates engineering geology in foundation in the area. The whole area are divided into threepartitions:Ⅰ area, natural foundation is suitable for high-rise and low-riseconstructions planning; Ⅱ area is appropriate for construction planning of multilayerbuildings, the cost construction of high building is a little higher than Ⅰarea, and isnot suitable for construction of low-rise buildings, if built, it can be a waste for thenatural foundation; Ⅲ area is suitable for low-rise buildings. If built multi-storey andhigh-rise buildings, there is a need to deal with natural foundation, or to consider thefoundation type selection. This paper provides a scientific basis for the rationaldistribution of buildings for urban planning.