FORECAST OF KARST-FRACTURED GROUNDWATER AND DEFECTIVE GEOLOGICAL CONDITIONS

The unknown geological disasters such as water and slurry often gush in karst area during construction of tunnel,which brings momentous disaster and unestimated economic loss to construction safety.The precise and immediate advance forecast to the development of karst is the key problem to be researched and solved currently in tunnel design and construction in the karst areas,which brings important theoretical significance and practical value.A recent development of the forecast and the integration system of the forecast about the karst-fractured groundwater and the defective geological conditions are first introduced in detail.The key issues of karst-fractured groundwater and the defective geological condition in prediction are derived,then the method of forecasting defective geological condition and the karst-fractured groundwater with high pressure and large flow discharge are summarized.The engineering examples such as tunnel seismic prediction(TSP) prospecting karst cave,landsonar prospecting fault,geological radar prospecting underground water and infrared water detecting method prospecting karst-fractured groundwater are introduced emphatically.At last,the effective methods of forecasting all kinds of the defective geological conditions and some study ideas and difficult technology are given;and the next stage of work to be undertaken is discussed deeply.The theory and technology initiative has help and positive guides in the fields of the forecast of the karst-fractured groundwater and the defective geological condition.