TRT在岩溶隧道地质超前预报中的应用研究

Study on the application of TRT to geological prediction in carst tunnel

地质超前预报对于隧道施工具有重要的指导作用,常用的方法分为地质分析法、物探法和超前钻探法。本文引入了一种新型物探方法——真反射层析成像(TRT),该法采用锤击震源,减少了对隧道围岩本身的损坏;采用空间多点激发和接收、三维空间观测方式和无线传输信号模式,对岩体中反射界面位置的确定、岩体波速和工程类别的划分都有较高的精度。通过与TSP203系统结果及开挖实际比较发现,TRT法是一种操作简便、成果直观可靠、适用且高效的复杂山区隧道地质超前预报方法,具有广泛的应用前景。

Geological prediction plays an important instruction role in tunnel construction witch is divided into geological analysis,geophysical survey and drilling ahead the cutting face.A new geophysical survey method-TRT-was introduced in the paper.By TRT,hammar was adopted to excite,which could decrease the damage to surrounding rock mass in the tunnel;spatially multi-point excitation and receipt,3D spatial observation and wireless signal transmission mode were used to accurately determine the position of reflection interface and wave velocity of rock mass,to classify the engineering type.By comparison with prediction result of TSP 203,the paper reveals the result that TRT is a simple,direct,reliable and effective method for tunnel geological prediction with extensive application prospects.