The surrounding rock deformation laws of shallow-buried biased super-large cross-section tunnel excavated via CRD method

On the engineering background of rare domestic large-span and super-large cross-section tunnel-Qianou tunnel,data of surrounding rock deformation was obtained through in-situ monitoring.Firstly,those data were cut off by upper limited velocity method; Then,they were analysed by Wavelet.Besides,a 2-D numerical model was set up by ANSYS to simulate the construction process.Some deformation laws were obtained as follows:The horizontal convergent calculated value of upper right heading was 18 mm,which was obviously much more than another two orientations,8.6 mm and 3.8 mm respectively.While,the horizontal convergent calculated value of whole section was 7.9 mm,which was approximately coincident with another two orientations,4.5 mm and 4.4 mm,respectively;The construction method had a comparatively more obviously influence on the convergent curve of upper right heading,which showed an obviously periodical character,while,the periodical character showed by the convergent curve of whole section was not that obvious.