The Comprehensive Evaluation Of Building Foundation Stability Based On3D Geological Model

3D geological modeling use of computer technology by a specific algorithm andsurface fitting of stratigraphic lithology and geological structure is set up attributes suchas the mathematical model of three-dimensional image and place it in the form ofscience and technology. Through3D geological modeling, the geological information ofspatial distribution of uneven and discrete are changed into a continuous, visual imageand intuitive3D geological model, which can describe detailed of each element of thegeological structure and lithologic characters and the spatial relations of the form, using3D geological model of spatial attribute parameter analysis function can quickly andtimely present geological information, and to evaluate its geological attribute analysis.The paper takes Tianhong commercial building area as the evaluation area, usingthe the drilling data, the rock mass physical and mechanical properties, engineeringgeological environment situation, etc of Tianhong commercial building, through the3Dgeological modeling software GOCAD (Geological Object Computer Aided Design)build Tianhong commercial building area of three-dimensional geological visualizationmodel and parameter attribute model, the model cutting test proves the feasibility andaccuracy of the model, in the form of3D image, it is intuitively, dynamically and truelyreflected the stratigraphic distribution and change law of rock mass physical andmechanical properties of the study area.GOCAD is used to cutting the model the surface under the20m, intuitive and clearin the form of cross section shows the20m depth of lithologic distributioncharacteristics, and has carried on the analysis and evaluation, the selection of high-risebuilding foundation to the research area has played a guiding role. Then using fuzzycomprehensive evaluation method, carries on the comprehensive evaluation on thestability of the foundation, using the analytic hierarchy process (ahp) to determine theweight of evaluation index set, and determine the membership degree of index set,according to the engineering geology, rock mass related procedures, specifications, andsimilar areas of the practical experience to determine evaluation set, the buildingfoundation stability degree is divided into four evaluation level, for the better stability(â… level), the good stability (â…¡level), the poor stability (â…¢lever), the poorer stability(â…£ level), and finally determine that the foundation stability is better in the study area (â…¡ level).In general, the paper puts the2D discrete, the raw data of research area into3Dinformation, integrated, in order to establish the three-dimensional structure model andparameter model, which shows the various geological characteristics of the researchdistrict truly and accurately, combining with the fuzzy comprehensive evaluationmethod has carried on the comprehensive evaluation on the stability of foundation,which provides a new train of thought and method for the stability of buildingfoundation...