The Applied Research Of The Comprehensive Physical Methods In The Leading Tunnel Geological Forecast

The comprehensive physical geological leading forecast is a necessary method to ensure the safety of tunnel construction, which is walking up to maturity gradually after more than ten years'development course beginning from early days of 1990s. Although there are numerous problems in the method itself, they are conquered little by little by the joint efforts of the experts and scholars. The comprehensive physical geological leading forecast reveals a favorable developing tendency by its abundant varieties and apparatus in use which are experiencing great changes from depending on import completely to independence developing. The effective combination of the system of the TSP geological leading forecast for the long distance forecast , the method of geological radar for short distance precise forecast and infrared water exploration used for evaluating hydrous level or not in front of the workaround can be confirmed each other and improves the accuracy of exploration results. They are used most popularly and valuably. The paper not only recommends the basic principles of the system of the TSP geological leading forecast, the method of geological radar and infrared water exploration, but also introduces briefly their common types of apparatus, expatiates on the significance of the comprehensive physical technique on the level of the practical applications, especially taking their comprehensive applications on PingLing Tunnel in WuGuang Passenger Railway Line as a good example because it is a god-given instance. At that time, the section to be surveyed welled up mud and water suddenly up to more than 3000 cubes. Just due to the leading forecast's prediction in advance, a extraordinarily serious field-man-casualty accident was avoided and uncountable economic losses were retrieved. The paper elaborates on each method's means of disposal lines for correlative collecting data, the programs of data processing and the judgment principle of collecting data results with serial corresponding data images. Furthermore, the operating instructions and improved measures during collecting data are also mentioned. By comparing the forecast's results of each method, it can be seen clearly that the abnormal position is identical basically and the comprehensive physical geological leading forecast can help field men take measures in advance, correct parameters and insure the construction safety of tunnels. Therefore, it should be good advice to popularize the geological leading forecast. Of course, We cannot deny that there exist heaps of problems waiting for solution and improvement in technology, such as eliminating surrounding noise disturbance, judging cubage size of the rear cavity, the exact position of the ill geological body and distributing characters. By the collective efforts of the characters in and out of the trade, it is believed that the leading geological forecast will have the qualitative leap and development.