SYNTHETIC ADVANCED FORECAST TECHNIQUE BASED ON
GEOLOGICAL LOGGING FOR TUNNEL FACE AND GROUND PENETRATING RADAR
(1. Department of Hydraulic and Ocean Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Zhejiang Provincial Design Institute of Water Conservancy and Hydroelectric Power，Hangzhou，Zhejiang 310002，China；3. Shaoxing Municipal River Channel Comprehensive Improvement and Investment Development Co.，Ltd.，Shaoxing，Zhejiang 312000，China)
Abstract：Synthetic advanced forecast technique based on geological logging for tunnel face and ground penetrating radar(GPR) is proposed and put into practice in the case of a certain deep and long tunnel project. On the basis of regional engineering geology data analysis，the forecast scheme and time are optimized depending on tunnel face geological logging. Meanwhile，according to the occurrence of adverse geological body which has been partially exposed and the location of single side wall which has been seen，the border and influence length of adverse geological body on the two side walls and apex of arch are calculated through trigonometric functions. When getting close to special geological sections，more accurate short-term forecasts have been obtained using GPR to detect faults and underground water storage situations based on radar-wave reflection amplitude，phase and frequency. For a wide range of adverse geological body，the reliability of forecast can be improved with the strategy of continuous forecast，which is useful for the confirmation and feedback of the forecast. This synthetic geologic forecast method is applied to the tunneling construction passing through faults and water inflow sections，and gives a satisfied effect.
2010, Vol. 29 
