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隧道衬砌采用永久性锚杆支护,是打破洋框框的一个有效措施。我局选择了某隧道,在123米范围內,不作衬砌,用灌浆金属锚杆作永久性支护。我们成立了试验小组,进行了金属锚杆承载力的试验,参考了兄弟单位所使用的锚杆式样和文献资料,作出了灌浆的楔缝式金属锚杆支护的设计和施工。某隧道不衬砌地段为白云质灰岩,质坚而脆,大体上岩层较完整,岩石强度系数为6,局部略现破碎,该段开挖迄今八年,无严重风化、剝落或掉块等现象。但暴露的岩层,节理似较发育,为预防计,采用灌浆的楔缝式金属锚杆作永久性支护。由于楔缝式金属锚杆具有结构简单,锚固性能良
Tunnel lining with a permanent bolt support, is to break the box frame an effective measure. I selected a tunnel, in the 123 meters, not for lining, grouting metal anchor for permanent support. We set up a test group to test the bearing capacity of the metal anchor. The design and construction of the grouted wedge-shaped metal anchor support were made with reference to the bolt patterns and literature used by the brothers. A tunnel is not lined section of dolomitic limestone, hard and brittle, generally rock formation more complete, the rock strength coefficient of 6, the local slightly broken, the section of the excavation so far for eight years, no serious weathering, spalling or dropping block phenomenon. However, the exposure of the rock, joints more developed, for the prevention of the use of grouted wedge-type metal anchor for permanent support. As the wedge-type metal anchor with simple structure, good anchoring performance