盘道岭隧洞险段工程加固措施及效果

Consolidations Measures Taken in Pandaoling Tunnel Vulnerable Section and the Results

盘道岭隧洞是甘肃引大入秦灌溉工程总干渠上最长的无压引水隧洞。隧洞建成后，在进口段和出口段出现连续贯穿性纵斜向裂缝，缝宽４～６ｍｍ，危及隧洞长期运行安全。主要采取钢拱架、拱墙喷钢纤维混凝土及表面抹钢丝网水泥砂浆、底拱现浇钢筋混凝土等措施进行加固。实践证明，上述加固措施提高了衬砌结构的整体承载能力，抑制了裂缝的产生和发展，效果较好。

The Pandaoling tunnel is the longest non-pressure diversion tunnel of the main channel of theDatong River to Qinwangchuan region water transferring irrigation project. After the completion ofthe project. fissures appeared in the inlet and outlet sections, with width between 4 mm to 6 mm.threatening the long-term safe operation of the tunnel. Technical measures had been taken. such asarched steel supports, arched wall with gunited reinforcement wire concrete, metal lath and plaster onthe surf see of the tunnel. poured-in-concrete on the bottom arch. Practices show that the abovementioned consolidation measures increased the entire bearing capacity of lined structures. preventingthe further development of fissures.