Optimization of Wave Velocity Parameters for TRT Forecast and Its plication in the Advanced Geological Forecast of a Karst Tunnel in Guizhou
(1 School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044； 2 Beijing Rail Transit Line Safety and Disaster Prevention Engineering Research Center， Beijing 100044)
Abstract：
The basic principles of TRT technology are analyzed and discussed, and the advantages and disadvan?tages of TRT technology in tunnel geological forecasts are listed. Considering that the selection of TRT background wave velocity is greatly influenced by human factors and lacks objectivity, a calculation mode for the direct velocity confidence interval under a normal distribution is put forward. The upper and lower thresholds of the confidence interval were used as the background wave velocity parameters put into the TRT system for calculation and analysis,and to some extent this method avoids the limitations of a single background wave velocity selected manually for geological disaster forecasts in Karst tunnels. For analysis of the resulting TRT images, the map would be divided into three pairs of chromatographic bands to be interpreted and analyzed, and thereby the interpretation of the TRT images shall be more targeted. Based on the segmented wave velocity information and the geological field data of a certain Karst tunnel, a comprehensive geological forecast was conducted and the accuracy of this method was verified
TIAN Gang- 1,
2 Bai-Ming-Zhou- 1,
2 Wang-Cheng-Liang- 1 etc
.Optimization of Wave Velocity Parameters for TRT Forecast and Its plication in the Advanced Geological Forecast of a Karst Tunnel in Guizhou[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(5): 200-207
2016, Vol. 53 