引大入秦工程盘道岭隧洞病害特征分析

Analysis of Datong River Diversion to Qinwangchuan Project Pandaoling Tunnel Disease Characteristics

盘道岭隧洞是"引大入秦"灌溉工程总干渠上第37号隧洞,随着第五个国家级新区——兰州新区的成立,引大入秦工程将承担为新区生产生活供水的任务。但是由于工程地质条件复杂,隧洞在建期间和运营后出现了衬砌裂缝、渗漏水、地下水的侵蚀等病害问题,多次维修仍不能控制。通过对维修期间衬砌裂缝监测和地下水化学组成的分析,表明地下水对衬砌的侵蚀和裂缝的发展有促进作用,是隧洞病害的重要因素。

Pandaoling Tunnel is No. 37 tunnel on total main canal of Datong River Diversion to Qinwangchuan Irrigation Project. Datong River Diversion to Qinwangchuan Project will assume the task of supplying water for production and life in new district with the establishment of the fifth National New District—Lanzhou New District. The tunnel suffers from various disease problems during construction and after operation such as lining crack,seepage water,groundwater corrosion,etc.due to the complex engineering geological conditions. The problems still cannot be controlled after maintenance for many times. It is indicated that groundwater can promote lining corrosion and crack development through monitoring lining cracks during maintenance and analyzing groundwater chemical composition. It is an important factor of tunnel disease.