研究目的: 中国在阿尔及利亚承揽的阿尔及尔至奥兰铁路项目，是该国北部环地中海经济区的重要路网组成部分，铁路全长 55 km，连接首都及主要工业区。甘塔斯( Ganntas) 隧道是本线的重要控制性工程，全长7． 342 km，穿越甘塔斯低山区，地形、地质条件复杂，该国先后邀请意大利、法国等多家勘察机构，研究数十年，一直无法实施。为了解该隧道及全线的地质概况，我国于 2008 年该项目中标后，选派经验丰富的高级技术人员常驻现场，重点使用了综合地质勘察方法。
研究结论: 查明了该隧道的地层、构造、水文地质情况，取得了 RQD、Q max、裂隙发育程度等隧道围岩分级的主要参数，依照法国围岩分级方法，得出岩体质量总分 RMR 值，取得了很好的研究效果。综合地质勘察方法应在国外工程中重点推广使用。
Research purposes: The railway project from Algiers to Oran in Algeria Constracted by China is an important part of road network ringing the Mediterranean Economic Zone in the north part of Algeria，with the total length of 55 km to connects the capital and main industrial areas． The 7． 342 km long Ganntas Tunnel is an important controlling engineering and passes through the low mountain area of Ganntas with complex topographic and geological conditions． Algeria had invited a number of survey institutions from Italy and France to research the geological survey for decades，but little achievements had been made． After winning the bidding by China in 2008，the comprehensive geological survey method was used for the geological survey of this railway by Chinese experienced senior technicians．
Research conclusions: The stratum，geologic structure and hydrogeological condition of the tunnel was found out，and the main parameters related to the RQD，Q max ，crack development and surrounding rock classification were gained． In accordance with the France surrounding rock classification method，the rock mass quality score of RMR was obtained，achieving very good results． The comprehensive geological survey methods should be widely used in foreign projects．
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