THE ADVANCED PREDICTION AND EMERGENCY MANAGEMENT TECHNIQUE ON CONSTRUCTION OF SHALLOW BURIED LARGE SECTION BEDDING ROCK UNSYMMETRICALLY LOADED TUNNEL

摘要

The biggest difficulty of tunnels and other underground engineering lies in its uncertainty and hidden, and it often occur with sudden disasters in the construction process. The use of data analysis and forecasting method, ground penetrating radar method, infrared detection method and surface geological survey method and other methods can be effectively carried out on advanced prediction, make early warning before a disaster, to avoid or reduce losses caused by disasters, However, because of the complexity of underground engineering geological conditions and differences of the construction technology, the prediction methods have a larger uncertainty and hysteretic nature, accurate and rapid prediction and emergency response have abstracted long-term concern in engineering. The paper study the correlation in the data of Monitoring on field ground and inside the cave, which based on the construction of shallow buried large section bedding rock unsymmetrically loaded tunnel named Jianfengding on Wuhan-Guangzhou passenger dedicated line, establishing a geometric and mathematical models, analyzing the law of development of surface cracks and changes of land subsidence, then the value of deformation of early warning is given according to failure theory and the theory of rock strength criterion. Using dynamic analysis and forecasting methods, the paper obtained the advance warning of the construction process, pointed out the specific location of construction segment, which has the possible collapse, and the harm caused by landslides, and proposed the emergency treatment technology. Engineering practice shows that the dynamic analysis and forecasting methods in tunnel construction process can forecast effectively and reduce accidents, provide the guarantee of the safety of tunnel construction, reduce the construction costs, improve the quality of construction etc., and it also gives a reliable basis on design and construction of other tunnels.