Abstract: Site measuring is an important method to check the stability of surrounding rock mass and the design and construction technology of supporting and lining, and also, it can guaranteed the safety of the NATM construction, improve the economic efficiency. West Qinling tunnel on LanzhouChongqing tunnel is a singlelined tunnel with large crosssection, and it is difficult to measure the deformation of surrounding rock by using traditional measuring method. The nonruler tunnel deformation measurement technology is adopted, so as to solve the problems of high measuring point and measuring difficulty. The measuring principle and data of nonruler tunnel deformation measurement technology by total station are analyzed, with its application in TBM tunneling of West Qinling tunnel as an example. In the end, the easy operation and high efficiency of the technology avoids the influence of the measurement on the construction. The paper can provide reference for similar projects in the future.

Key words: West Qinling tunnel, TBM tunneling, nonruler tunnel deformation measurement technology, data analysis