Study On Method And Application Of Geological Forecast In Tunnel

Tunnel geological advance prediction is an important guarantee of the tunnel construction safety. With the complexity and uncertainty of geological condition. Geological disasters occur frequently in the tunnel construction. So the advance prediction becomes an important part in the construction of the tunnel. However, the existing prediction technique based on experiences mostly, its accuracy of prediction should be further improved.The main contents of this study as follows:(1) Study the propagation characteristics of the reflected wave on which the different reflection interfaces, with the physical and mechanical properties of rock and the analysis method of the time-distance curve. According to the TSP reflection wave propagation properties to preliminary understand the quality structure of Body structure in exploration area ,and then optimized design of minimum offset, minimum cannon spacing .(2) Combine with example of DongTang Ditch tunnel advanced prediction, In data collection, through optimized the sensor installation, casing embedment,the choice of blasting cap and the quantity selection of explosive source etc, obtaining the best data acquisition plan, provides a powerful guarantee for the data processing.(3) Analyze the principle and process of the impact drill drilling,and combine with concrete example to get results on impact drill drilling forecast experience, drilling is normal and drilling rock powder is fine which show that surrounding rock joints less and rock complete. Conversely, rock joints are more,broken and development.(4) Discuss the principles of integrated geological prediction and integrated forecasting procedures in detail. Put forward the early-warning method of tunnel integrated geological advance prediction. Integrated advanced prediction technology realized the different forecast methods complementary and complement each other, confirm each other. It is a great value for areas with complex geological conditions. Because any error judgement will cause an irreparable damage.