贵广高铁14座隧道下方溶洞的探查

Surveying Karst Caves in Bottom of Tunnel of 14 Tunnels on Gui-Guang High Speed Railways

贵广高铁通过岩溶发育区,在勘查时未能施工处理,溶洞、断裂和岩溶水将会在通车时造成危害。贵广高铁在联调联试阶段发现了隧道中道床底鼓的问题,决定作全线补充探查。作者承担了贵广高铁14座隧道的探查,每条隧道设三条平行测线,测线总里程近70 km。采用陆地声纳法,在探查0~13 m深、投影直径≥1 m的溶洞方面取得了好的效果。现场数据采集效率可达3 km/台班,并采用3个组和3台仪器同时并排工作,提高采集工作效率,并在不到一个月时间内完成了资料处理及解释工作。对探查出的4 491个溶洞,根据埋深和投影直径做了分级并在剖面图上标示。

There are many parts pass Karst zone in Gui-Guang high-speed railway,and several Karst caves under tunnel bottom was uncovered at construction stage,but never was surveyed. Some dangerous problems such as Karst caves,fractures and Karst water was revealed at the debugging stage. Railway administration decided to survey on all line. The authors' company surveyed 14 tunnels and the totals survey line was 23 km. With Landsonar Method,good results were achieved for surveying the single Karst caves whose diameter were greater than 1 m within 0 ~ 10 m in depth. Each machine-team can finish 3km along the survey line. 3 groups and 3 instruments were used at same time,and all the data processing and interpretation were finished within one month. Then all 4 491 Karst caves were classified into three classes and marked on the profiles.