The Development Of Computer-aided Assistant Decision-making System For Hazard Prediction In Tunnel

As one of the typical geological engineering, the fundermental geological condition and the occurrence possibility of the geological hazards, which is an important safeguarding for tunnel's excavation, must be surveyed clearly. With the development of high-level highway and railway tunnel, a more strict demand was put forward for the accuracy and real-time for tunnel's geological prediction. In order to meet this demand, and also for improving the information level and intelligent level, a computer-aided decision-making system for hazard prediction in tunnel was developed, on the basis of collecting widely of kinds of geological prediction methods and hazard prediction method. The main contends and results can be concluded as follows:1. Discussed clearly of all kinds of common used geological prediction methods. The data needed and the content that can be predicted were discussed carefully, and on this basis, the geological prediction data can be under the management of computer.2. The common used methods and the data needed for lithology, fault and underground water were discussed. The decision-making model for each type was developed for helping users to predict quickly and well.3. The common used methods for rock burst prediction and rock burst classification were discusses. Stress-strength ratio and Wet were used in the system as the quantitative prediction methods. Expert system was also used for the qualitative prediction. Rock strength, rock mass structure, field stress, underground water, geological structure and project arrangement were synthetically discussed in the system for the prediction of rock burst.4. The geological analysis methods and monitoring measurement were adopted for the prediction of large displacement. In the paper, the characters and mechanism were discussed on the basis of large displacement classification. Several kinds of critical influential factors were considered for predicting what kind of large displacement could be made under the combination of several adverse geological conditions. On this basis, ground displacement value, ground displacement velocity and ground displacement accelerator were adopted as the factors for predicting the trend of displacement. So the users can take measures to control the development of large displacement.