The Research On Suitability Of Geological Environment For Engineering Construction In The Urban Area Of Baoshan

With the rapid growth of social economy in the new era,the infrastructure construction in urban central area is more and more frequent,the supply and demand relationship of urban engineering construction land is more and more tense,and the requirements for engineering geological conditions are more stringent.Because people do not pay enough attention to the resources and long-term utilization of urban geological environment,there are different degrees of geological problems in urban planning areas in many areas,which provide reference for the development of urban planning To solve the contradiction between human engineering construction activities and the destruction of urban geological environment system.Based on the evaluation index system of geological environment suitability established by the special subject of "Research on the construction method of 3D data information platform of urban geology in Yunnan",this paper analyzes the geological environment of engineering construction in Baoshan Urban planning area,which focuses on the two main engineering geological problems of engineering geological conditions bearing capacity and engineering geological conditions special soil,and establishes the 3D geological evaluation index system of the research area In this paper,the suitability of geological environment in urban planning area of Baoshan City is systematically studied by using AHP and expert scoring method.In the process of research,the following understanding has been obtained:(1)The main geological environment problems of engineering construction in the study area include engineering geological conditions-bearing capacity(6 categories),engineering geological conditions-rock and soil types(3 categories),engineering geological conditions-special soil(4 categories),hydrogeological conditions(8 categories),topography(3 categories),human activities(3 categories),geological disasters(3 categories),adverse geological processes(1 category),active faults and seismic effects There are 9 categories in total.It is found that the foundation bearing capacity and special soil have the largest impact on the project construction in the study area,and the overall distribution of foundation bearing capacity in the study area is relatively uniform,which has little impact on the project construction activities,while the distribution of red clay,expansive soil,soft soil and sandy soil is relatively uneven,which has a great impact on the project construction.(2)In the process of studying engineering geological conditions special soil,there are many complex index parameters that affect the characteristics of four kinds of special soil,and its characteristics and mechanism are difficult to determine.In this paper,the numerical relationship among water content,free expansion rate and expansion force is fitted by Origin Software for the characteristics of expansive soil in special soil,and the value of expansion force is controlled by two important parameters of free expansion rate and water content,The quantitative classification of shear failure of building foundation caused by expansion force is obtained.The shear grade of expansion force is divided into four grades: no damage,slight damage,moderate damage and damage.(3)The hierarchical structure model of geological environment suitability for multi-storey building engineering construction and the hierarchical structure model of geological environment suitability for small high-rise building and above engineering construction are established by Yaahp software.The comprehensive suitability zoning map of geological environment in Baoshan Urban planning area is drawn based on Arc GIS.The results show that the overall terrain of the study area is relatively flat,which is suitable for the development of low rise buildings,and the local area is suitable for the development of high-rise buildings Architecture.(4)In the evaluation process,due to the selection of a large number of factors,and the existence of individual indicators in the process of qualitative analysis value is not accurate enough,also need a lot of data to verify.