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Long tunnel to the general depth of a large and complex geological conditions , is difficult to pinpoint in the initial investigation of the hydrological and geological conditions . Geological advanced prediction timely Front of Face the geological circumstances change , achieve the purpose of advance engineering measures to control the risk . Papers by the Geological Survey , the theoretical analysis , numerical simulation and field detection method on a comprehensive geological long tunnel under complicated geological conditions ahead of forecasts related issues more in - depth studies . The main contents of the paper and the results are as follows : ① summarizes and compares the commonly used method of geological advanced prediction , focuses on the basic theory of geological radar detection , detection method , detecting devices , data acquisition , and data processing and TGP forecasting system principles and methods of analysis . Combined with the advantages and disadvantages of the various geological advanced prediction methods , the proposed comprehensive geological advanced prediction method based on a geological geological radar as the core , as a secondary wave seismic reflection method . ② Because the the geological law is the basis of the comprehensive geological advanced prediction , long tunnel Yunzhongshan a detailed geological survey and hazard analysis , master engineering geological and hydrogeological characteristics of the tunnel site , preliminary analysis of the tunnel construction may occur types of geological disasters . ③ using finite-difference time-domain method written Mtalab procedures , forward modeling of the complete wall rock fracture zone, water-rich zone , cave common geological conditions of geological radar , get a different scale , different angles , different sizes , different filling 11 common objects geological conditions typical geological characteristics of the radar image . ④ tunnel to Yunzhongshan relying This paper presents a comprehensive geological advanced prediction methods applied to engineering verification and accuracy , continuity , timeliness , analysis and evaluation of the extent of construction impacts , indicating that the method can meet the complex geological conditions , grew up in the tunnel 's construction needs .
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