Fundamental And Application In The Worse Geological Tunnel Section On NATM

NATM, the character of witch lies in the advanced theory and the practical measure, is the main construction way for dealing with the worse geological tunnel section. It consists of three important supportings, that is, the smooth blast, the control measurement in-situ and the optimization about the design parameters based on the information of the surrounding rock. This paper, focusing on the construction in the tunnel section with the worse geological conditions, discusses systematically the theory and the actual application on NATM, and puts forward the proposal that the natural states of surrounding rock must be disturbed as small as possible and the self-loading of rock should be made full use of. As emphasizing the main point of the method the study of doing extensively the work of the measurements and the relevent analysis in the site takes up the much space in the paper. And then they are followed by the backfeed to the design in time according to the information coming from the surveying, the observing and understanding the surrounding rock so that the optimum coefficients of the supporting and the constructing can be used in and as conducting the in-situ work. Meanwhile, the paper seeks also the deformation regulation of the rock on the basis of the data grasped in the site, and then develops the research of the theory and engineering practice on the back analysis of the actual deformation through the measurement, all of witch offer effectively the means and the way for the further study of engineering data.