| With the rapid economic development and extensive basic construction of our country, the west part of china becomes an important link to perfect the network national highway. However the complicated geological condition of the west region:chain of mountains and a pile of screen-like mountain peaks,vertical and horizontal gullies, has brought the great difficulty to the construction of highway, particularly when building the long tunnel in the mountain area, because the geological disaster taking place frequently, it directly threatens the construction safety.So, fore geological forecast is a very important part during the construction time.This text is based on collecting the information of forthgoer and the analysis of domestic and international technological methods. Having tried out the new technology and the comprehensive forecast with geological analysis as the core in the Tongluoshan tunnel, it has made great effects. I summarize the experience in carrying on the leading real work that forecast the geological condition in the Tongluoshan tunnel at the same time, and brought the method of fuzzy assessment into the comprehensive analysis of fore geological forecast in Tongluoshan tunnel through utilizing some available principles, extensively referring to productions of other tunnel explorations, setting up some primary method of comprehensive analysis of fore geological forecast for basic geological in Tongluoshan tunnel and conclusion drawn from study as follows:1. Through the practical application of BEAM (Bore Tunnelling Electrical Ahead Monitoring) in the Tongluoshan tunnel it has amply evaluated its working way, the principle of interpretation and the practical effects o BEAM has made great effects for the fractured rock mass with water, but it has a little difficulty in tunnel with drill and blast drives because of the complexity of its survey mode. So, its working way and principle of interpretation need to be improved in future.2. Through the practical application of TEM (Transient Electromagnetic Methods) in the Tongluoshan tunnel it has amply evaluated its working way, the mode of data processing and the practical effects. TEM shows the great advantage in the forecast for karst water, but the effects is not very well in the forecast for other geological condition and its the veracity of forecast has been influenced because its exploration in tunnel is disturbed by many factors.3. Through the practical application of GPR (Ground Penetrating Radar) and TSP (Tunnnel Seismic Predication) in. Tongluoshan tunnel ,it has amply evaluated its working way, the practical effects and applicable geological condition, and has summarize the corresponding relationship between the composite features of electromagnetic wave and different basic geological conditions.4. With geological analysis as the core, combine several methods to carry on comprehensive forecast, which has achieved good results in the practice of the Tongluoshan tunnel. Depending on experience of a lot of work in Tongluoshan tunnel and the expert's idea of fore geological forecast in other tunnel, It has abstracted the key parameter and put forward the method and process of comprehensive fore geological forecast for 4 kinds of basic geological condition. It primarily set up the multifactor set which are endued weight by analytical hierarchy process to do fuzzy comprehensive assessment for basic geological condition, which results mostly accord with drives circs.
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