Study And Application On Dynamic Safety Information Visual Model Of Large-scale Underground Caverns Construction

In recent years, underground caverns group is becoming frequently-used plantslayout style in large hydropower station projects. For the sake of safe, economical andquick construction, it is necessary to realize information sharing and visualizationmanagement during construction period to have an overall and intuitionistic view ofinfluence factors.4D technique and safety information model are introduced intostudy on safety information visual management of underground caverns group inhydropower station, including choosing3D data structure for engineering safetyinformation carrier model, visualization algorithm of safety information data field and“construction-model/information” dynamic mapping method based on mesh model.The dynamic safety information model of underground caverns group duringconstruction in hydropower station is established based on methods and technicalroute above, and used in practical engineering. The results of the study are as follows:(1) According to engineering structure features and goal of modeling, appropriate3D data structure is chosen to express the model. B-Rep model is chosen as middlemodel, which is switched to volume element style as the final carrier model of safetyinformation. Traditional volume rendering method of data field is simplified, so thatefficiency of rendering is raised. Based on “construction-model/information” dynamicmapping method of mesh model,3d model of underground caverns and safetyinformation is updated in real time and visually expressed.(2) Dynamic safety information visual model for large-scale undergroundcaverns group during construction period is divided into four sub-models: geologicalinformation model, construction progress information model, monitoring informationmodel and numerical simulation model. Each sub-model is built and integratedmanagement and visual display of relevant information of engineering safety analysisis realized based on method and technical route studied above.(3) Dynamic visualization management system of safety information ofunderground caverns group during construction is developed with OpenGL TaoFramework and C#based on these techniques above, with which integratedmanagement of information relative to safety analysis such as geological information, construction progress information, monitoring information and numerical simulationdata is realized.(4) Taking the underground caverns group of a hydropower station for example,dynamic coupling visualization of the figure in different construction stages andstructure safety, and real-time update of safety information with construction progressare realized, and evolution law of underground caverns group safe condition duringconstruction is revealed visually. These may meet engineers’ demand for visualexpression and real-time dynamic visual analysis of slope safety information duringconstruction period.