为提高地质解释的准确性，分别对二次衬砌厚度、钢筋钢拱架分布和混凝土不密实判别的方法进行研究，并以大泉沟隧道为例，利用地质雷达进行衬砌质量检测，检测结果与设计相对比，结果表明地质解释的准确性比较高，证明所提出的判别方法在地质解释中是有效的。通过理论研究与实际工程经验总结，得出： 1）地质雷达法具有简便、快速、覆盖面广、准确性高的优点； 2）对地质雷达采集到的信号进行合理准确地处理后，才能进行地质解释； 3）第2层钢筋的判别受天线屏蔽作用的影响，必要时应与其他方法相结合。

The methods for the interpretation of the thickness of the secondary lining, the distribution of the reinforcement bars and steel ribs and the compactness of the concrete are studied, so as to improve the accuracy of geological interpretation. The quality of the lining of Daquangou tunnel is detected by means of geological radar. The comparison and contrast between the detection results and the original design show that the geological detection is accurate and the interpretation method adopted in the geological detection is effective. Conclusions drawn are as follows: 1) Geological radar detection technology is simple, rapid and effective. 2) Geological interpretation can not be made until the signals obtained by the geological radar have been properly processed. 3) The detection of the second layer of reinforcement bar is affected by the antenna screening.