Research on large deformation control technology of highly weathered carbonaceous slate tunnel

Abstract In order to further explore the large deformation control technology of high ground stress soft rock tunnel, this study takes highly weathered carbonaceous shale section Muzhailing tunnel as research background, effect scheme 1 “three-step method” and 2 “pilot expansion are compared analysed by field test numerical simulation. The results show that simulation consistent with test, trend is same. maximum occurs at middle step. From perspective deformation, reduced about 10% 1, both schemes does not exceed reserved (400 mm). construction efficiency, efficiency 23.07% lower than 1. Taking into account it recommended three-step method should be adopted in section, can provide a reference for slate tunnel.