Abstract Stress redistribution of surrounding rocks is a 3D process during tunnel excavation, the deformation re? sponse of the“advance core”in front of working face is closely related to cavern convergence, and the possibility of natural arching of surrounding rock after excavation is very much dependent on the lithology of“advance core”. So as the full-face pre-reinforcement measure, the glass fiber anchor bolts are commonly installed at tunnel working face for the fractured and soft rock mass in which natural arching is impossible. Through simulation analysis of fullface pre-reinforcement by glass fiber anchor bolts in different cases, the deformation law of working face varying with excavation process and the displacement index showing the effect of full-face pre-reinforcement were obtained. Based on the railway tunnel project in typical soft surrounding rocks and various kinds of cases, the optimized design parameters and construction schemes were proposed.
Abstract：
Stress redistribution of surrounding rocks is a 3D process during tunnel excavation, the deformation re? sponse of the“advance core”in front of working face is closely related to cavern convergence, and the possibility of natural arching of surrounding rock after excavation is very much dependent on the lithology of“advance core”. So as the full-face pre-reinforcement measure, the glass fiber anchor bolts are commonly installed at tunnel working face for the fractured and soft rock mass in which natural arching is impossible. Through simulation analysis of fullface pre-reinforcement by glass fiber anchor bolts in different cases, the deformation law of working face varying with excavation process and the displacement index showing the effect of full-face pre-reinforcement were obtained. Based on the railway tunnel project in typical soft surrounding rocks and various kinds of cases, the optimized design parameters and construction schemes were proposed.
XIAO Hongwu
.Mechanism and Application of Tunnel Full-face Pre-reinforcement Technology with Glass Fiber Anchor Bolts[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(5): 163-169
2019, Vol. 56 