甘塔斯隧道膨胀岩刚性支护设计与施工

On the Design and Construction of the Primary Rigid Supports for Ganntas Tunnel in Swelling Ground

详细讨论了阿尔及利亚甘塔斯隧道膨胀岩支护设计与施工所遇到的主要问题,指出初支设计应基于对实际地质情况的真正认识。施工过程发现,及早封闭仰拱、隔离围岩与空气的接触是减少膨胀性的有效措施;多层刚性支护是限制围岩膨胀性、简化施工、提高进度的较好支护形式。

Main difficulties and problems encountered in the design of the primary supports for and construction of the Ganntas Tunnel in the swelling rock stratum in Algeria are talked about in detail in the paper,with an important point of view dealt with that the primary supports should be based on the real understanding of the true geological conditions.In the course of construction,to find the swelling rock,to perform the early closure of the inverted arch and to prevent the surrounding rock from contacting the air are effective measures to keep the surrounding rock from swelling.And the multi-course rigid supports are good supporting forms to counter swelling,simplify construction and accelerate the progress.