Model test on creep deformation and failure characteristics of soft rock roadways

Abstract

This paper studies the creep deformation and failure characteristics of a soft rock roadway under the condition of combined support through a model test that lasted for 30 days. Under the action of high stress, the soft rock roadways present a tendency of continuous failure and nonconvergence, and the cross-sectional area shrinks to 52.3 % of the original roadway. The failure of the anchorage zone causes the bolt to lose its supporting function, and the continuous extrusion leads to the cracking of the lining and the shrinkage of the arch. Floor heave is the superposition of geometric deformation and loose deformation. The floor is continuously replenished by the movement of the surrounding rock below and to the two sides and moves upward under the combined action of high-level stress and vertical stress. Finally, the model test conclusion is verified by field tests, and deformation control schemes are proposed.