岩溶工程地质问题的存在对工程的安全稳定性有较大影响。霍永高速某隧道岩溶发育, 无充填物溶洞很多, 给隧道的施工带来了极大的困难。为了保证施工的安全, 采用地质雷达探测手段, 结合工程实际特点选取合理的探 测参数, 对该隧道拱顶及底部溶洞进行了探测。通过对典型波形图的分析, 结合雷达在不同介质中波形振幅的差异 及传播特点, 对溶洞的位置及范围进行了预测。隧底实际开挖情况与雷达预测结果相吻合, 验证了地质雷达在隧道 溶洞探测中的准确性与可靠性。通过对比几种常用的溶洞处理方案, 综合考虑安全性、经济性、施工方便性等因素, 给出了该隧道相应的溶洞处理措施建议。

The ex istence of g eolog ic pr oblems in kar st engineer ing has g reat influence on the stability o f the pr oject. Karst devel2 o ps w ell in a tunnel of t he H uoyo ng hig hw ay and ther e ar e a lo t o f unfilled cav es, w hich br ings g reat diff iculties to the tunnel co nstr uction. In or der to ensur e the constructio n safety, g round penetr ating r adar detectio n method and the eng ineering pr act ice wer e used to select the reasonable detection pa rameters and to detect tunnel vault and bot tom cav e. According to the ana lysis of typical w avefo rm fig ures, and t he differ ence of r adar wav efo rm amplitude in different medium and transmission char acteristics, the locatio n and range o f kar st cav e wer e estimated. T he radar detection results w ere in line wit h the actual ex cavatio n, w hich sug gested t hat t he g ro und penetrating radar detect ion is accur ate and reliable in t he det ection o f tunnel cave. T hroug h the com2 parison of sever al common cav e g over nance pro gr ams, the co rr esponding treatment measures for the kar st cave tunnel wer e pro2 posed in co nsiderat ion of the safety, eco nomy, and ease o f const ruct ion.

交通部西部交通建设科技项目( 200731800018)