3D Analysis Method Of Dynamic Penetration Test Used For Detection Of Vibro Replacement Stone Column In Composite Subgrade

This paper proposed the three-dimensional visualization of geological analysis as the main theoretical basis, combined with a large number of on-site data and original drilling date, using original spatial interpolation techniques to produce3D space research regional geological structure data field, and the regional geological structure of3D visualization was studied by real three-dimensional form. The author independently developed the dynamic3D analysis software agents JC3D.1processing system. JC3D.1system was applied on the3D modeling and analysis of geological detection of RenZong hydroelectric dam. In the simulation results of its analysis, the reinforcement measures should be re-taken on the area which was out of the standard. Combined with the on-site situation, the preloading method, dynamic compaction and excavation replacement method were recommended, and their characteristics were compared. Finally, the preloading method was economically feasible and selected. The main contents and results of the article were as follows:1. Dynamic Penetration Test3D analysis system. On the basis of discussing geological-mass model concept, classification, space geometry model visualization technology, a dynamic sounding3D analysis software JC3D.1processing system was written and verified by MATLAB. The results showed that the system is stable, reliable and safe.2. The construction and test of vibro-replacement stone column of RenZong hydroelectric dam foundation. The basic situation and geological conditions (including landform, stratigraphic lithology, geological structures, hydrology geology condition, intensity and bad geological phenomenon) of hydropower engineering were produced. And the design, construction process, Dynamic Penetration detection principle, and factors which used to evaluate the construction quality of vibro-replacement stone column were discussed.3. The3D test analysis and results of vibro-replacement stone column of RenZong hydroelectric dam foundation. The author gave emphasis on the layout principle of measuring point, and proposed the chart of measuring points and the method of coordinates determining. The Dynamic Penetration Test results was deal with JC3D.1analysis system, it worked out the three-dimensional results chart and statistical results table of whole area, qualified area, unqualified area under three methods and used slice technology to show the result data by2D. Compared static load test results with Dynamic Penetration Test3D detection results, it showed that the Dynamic Penetration test results and three-dimensional static load test results had better consistency, indicating the reliability and practicability of Dynamic Penetration Test3D analysis software in engineering practice application.4. Foundation stability analysis and treatment opinion. The foundation settlement analysis of unqualified area was conducted, and the suggestion about undertaking reinforcement was proposed. The technical and economic comparison of preloading, dynamic compaction and excavation replacement method was carried out. At last, the preloading method was recommended as the rework process scheme.