Advance Drilling Method In Tunnel Geological Forecast Applied Research

In the process of the construction of the tunnel, tunnel rock often will encounter all sorts of bad geological conditions, such as weak surrounding rock, water zone, karst cave, so if improper construction measures or not in time, will cause difficulties for tunnel construction surface, light delay of construction progress, or threatened the life safety of construction personnel. So, the advanced geological forecast for tunnel is very important. The commonly used geophysical methods are mainly GPR tunnel advance geological forecast geological radar, TSP advance geological forecast, advanced level of geological drilling, etc. Based on high-speed segment into county in gansu province ten days tunnel and tunnel construction ogawa. For the advanced level drilling, GPR, geological radar, TSP advance geological forecast, and the forecast results are respectively the geological interpretation. The advanced level of drilling and TSP advance geological forecast, GPR geological radar are analyzed.Horizontal drilling in advance geological forecast according to the corresponding constraints described, further complement revised according to the drilling speed, speed, advancing four drilling pressure, torque working parameters of the comprehensive analysis of the basic features of rock mass, such as the degree of hard rock, integrity, of geological strata, and complexity, etc. Advanced level of core drilling geological forecast is more intuitive, can directly see the change of strata, but certain error exists in the location prediction of rock mass, especially in the rock formation in a relatively weak, is not easy to get a complete core sample. With the level of impact drilling and coring drilling can only reflect single drilling geology, Therefore, there is limited information on the shortcomings of forecasts.Articles of advanced horizontal drilling geological results forecasts were fractal dimension analysis of the complexity of the prediction curve quantitatively described. Dimension range obtained under different geological conditions. It provides a new method for the analysis of advanced horizontal drilling results.