Abstract: The west track roadway in Pengzhuang coal mine is a typical soft rock roadway, which is buried more than 700 meters underground, and is frequently passing through the weak fractured mudstone layers. To better master the deformation and failure mechanism of the surrounding rock, based on field monitoring, borehole camera and geological radar detection, rock physical mechanics test, in-situ stress test and 25 kinds of numerical comparison experiments were carried out respectively in this paper. The results show that the deformation of the surrounding rock can be effectively reduced by the combined support scheme of high strength and pre-stressed anchor (bolt) & bolt-grouting, and the supporting structure integrity and bearing capacity can also be effectively improved. As a new supporting method of deep soft rock roadway, the supporting effect of the combined support scheme has significant advantages comparing with the traditional supporting method.

Key words: soft rock roadway, high ground stress, numerical test, deformation failure mechanism, bolt-grouting support