中文摘要：

隧道工程建设经常会遇到诸如溶洞、溶洞积水等不良地质情况,为确保隧道施工安全,普遍采用地质雷达探明掌子面前方是否存在不良地质体及含水情况,如何根据地质雷达波形及频谱特征进行解译显得尤为重要.利用可重复的砂槽,建立试验模型,模型中埋设空洞、空洞积水等典型不良情况,采用地质雷达对试验模型进行探测,获得不同地质条件的地质雷达检测数据,并对地质雷达数据进行频谱分析.结果表明：电磁波遇到不同地质时,地质雷达时间剖面图中出现明显振幅反射,但振幅衰减存在明显的差异性;随着介质的介电常数增大,地质雷达信号振幅衰减逐渐增大,但主振频率反而降低.模型试验成果为实际工程中对隧道掌子面前方不同地质情况的解译提供参考.

英文摘要：

Tunnel engineering construction often encounters adverse geological conditions such as karst caves, is widely used karst cavesseeper. In order to ensure the safety of tunnel construction, ground penetrating radar （GPR） for exploring the adverse geological bodies in front of the tunnel face, especially towater-holding condition. Therefore, it is of vital importance to explore how to interpret the waveform and spectrum characteristics of GPR. The model experiment is established by using the repeated sandlaunder. In the model, the typical adverse geological conditions such as cavity, cavity seeper were buried. Then the model experiment was detected by GPR. GPR data were obtained under different geological conditions. The GPR data were analyzed by Fouriertransform. The results show that when the electromagnetic wave encounters different geological conditions, there is an obvious amplitude reflection in the GPR time section. But the amplitude attenuation has obvious differences. With the increase of dielectric constant, GPR signal amplitude attenuation increases gradually, but the main vibration frequency decreases. The model experiment results provide a reference for analyzing the different geological conditions in front of tunnel face in practical engineering.