地质雷达在隧道健康诊断中的应用

Application of Geological Radar in Health Diagnosis of Tunnel

为了诊断运营隧道病害的程度,评价隧道的安全状况,分析了造成隧道衬砌背部存在缺陷的原因。阐述了采用地质雷达对隧道衬砌质量进行无损检测的原理及方法,并对某公路隧道进行了健康诊断。地质雷达探测结果表明:隧道衬砌背后出现的空洞都是孤立的,拱顶和拱腰的空洞总长占隧道总长的9%,隧道除拱顶衬砌厚度有4%小于设计值外,其余各部位衬砌厚度均大于设计值。对地质雷达探测结果采用钻孔法进行验证,其结果相吻合。利用检测结果评价该隧道衬砌结构安全等级,结果为B级。

In order to diagnose the disease degree of operation tunnels and to estimate tunnel＇s security condition, this paper analyzes the causes of bugs existing behind the tunnel lining, expounds the theory and method of making non-destructive test on tunnel lining quality by using geological radar, carries out a health consultation with a tunnel. The detecting results of geological radar indicate that the cavities appeared behind tunnel lining are isolated, and the total length of cavities in vault and haunch are as long as the 9% of tunnel＇s total length. The lining thicknesses of all the part in the tunnel are more than designed value except 4 % of lining thickness in vault. Adopting hole-drilling method to make verifications with detecting results of geological radar, the results of the two kinds of methods do not have big diflerence. The security level of the tunnel lining frame is examined with the detecting results, it belongs to level B. 1 tab, 3 figs, 6 refs.