Method of buffer layer with critical deformation of tunnel initial support as control target

Abstract

The present disclosure relates to the technical field of tunnel construction, in particular to a design method of a buffer layer with critical deformation of a tunnel initial support as a control target. The method includes the following steps: (1) establishing a mechanical model and calculating an ultimate bearing capacity of the tunnel initial support during critical damage based on a cusp catastrophe theory; (2) determining a critical deformation value of the tunnel initial support under the ultimate bearing capacity; (3) establishing a yielding control target of a tunnel buffer layer; (4) determining a performance index of the buffer layer according to the control target, and calculating corresponding index parameters. Compared with the prior art, the method has the following beneficial effects. The method aims to put forward the critical deformation value of the tunnel initial support under the ultimate bearing capacity, obtain an optimal yielding design parameters of the buffer layer by taking a compression and load transfer mode of the tunnel buffer layer as a link, and give a calculation method.