综合探测技术在隧道超前地质预报中的应用

Application of Comprehensive Detection Methods in Tunnel Geological Forecast

针对单一超前地质预报方法的局限性,目前常采用TST地震波法、探地雷达法和红外探测法相结合的综合探测技术进行隧道超前地质预报。文章阐述了三种探测方法的基本原理、实施过程和结果评价方法,结合片岩地区某隧道的工程实际,在地质调查和分析的基础上,首先采用TST地震波法对隧道掌子面前方120 m范围内的地质情况进行初步判断,再利用探地雷达法和红外探测法对掌子面前方30 m范围内的细部构造和含水情况作出进一步刻画。采用综合预报法可发挥各探测方法的优势,不同探测方法的结果可相互验证和相互补充,增强超前地质预报的准确性。

To overcome the limitations of single detection method for tunnel geological forecast,comprehensive detection methods including tunnel seismic tomography(TST),ground penetrating radar(GPR),and infrared detection were used.The basic principles,implementations and result assessments were introduced.A comprehensive geological forecast application was carried out in a tunnel project in schist area.Based on geological investigation and analysis,the TST method was first operated for a preliminary assessment of the geological conditions 120 m in front of the tunnel face.Then the GPR and infrared detection methods were employed to characterize the geological and aquifer structure 30 m in front of the tunnel face.The use of comprehensive detection methods can take advantage of each method.Results of different methods can be mutually verified and supplemented,thus the accuracy of geological forecast can be improved.