EXPERT SYSTEM FOR KARST GEOLOGICAL PREDICTION DURING CONSTRUCTION OF RAILWAY TUNNEL IN MOUNTAINS

There are many factors controlling karst development. Some of the factors are unascertain. On the base of analyzing a lot of existing information, such as Qiyueshan tunnel, Baziling tunnel, Yesanguan tunnel, Maluqing tunnel in Yiwan railway and Yuanliangshan tunnel in Yuhuai railway, geological guide lines system of prediction karst hazard in the course of tunnel construction is brought forward. These guide lines contain stratum and rock character, geology structure, landform and physiognomy, surface water and groundwater, tunnel design. According to actual date, karst hazard fatalness is divided into high, middle and low levels. Engineering geology characters of these three levels are made sure. Calculating powers of each individual factor are studied by using an expert evaluating method. The knowledge storeroom of karst geological prediction expert system is designed. The expert system of karst geological prediction in mountain tunnel is studied. Through application in Yiwan railway tunnel construction, the reliability of this expert system has been analyzed.