STUDY ON CONTROL TECHNOLOGY AND MECHANISM OF DEFORMATION AND DESTRUCTION IN SOFT ROCK TUNNEL UNDER HIGH GROUND STRESS

摘要

The destruction characteristics of shear sliding in soft rock tunnel are discussed and the main reason of relaxation, compression destruction and drum are explained in the floor of the soft tunnel. The tunnel design and construction are taken into consideration, and the support parameters of the original support are adjusted in site test. By site test, The deformation laws of soft rock tunnel, the changes and distribution laws between surrounding rock and initial support after using new initial support parameters are analyzed in phyllite stratum. In high ground stress, large deformation of surrounding rock in phyllite stratum was deep-buried relaxation and compression strain. At early stage, the strain speed was large, subsequently, it become smaller. The new initial support was safe and stable by site test