ABSTRACT:

This paper discusses on the stability of surrounding rock in broken soft rock roadway on the basis of the classification of soft rock. By analyzing the characteristics and influencing factors of broken soft rock engineering problems and the results show that the key to control the deformation of broken soft rock roadway is to improve the whole stability and bearing capacity of supporting bearing structure, rather than to simply control the discontinuous deformation in local roadway.

1 INTRODUCTION

The problem of broken soft rock roadway surrounding rock stability control has gradually become a major problem in the construction of the mine production. Under the effect of in-situ stress, highly jointed broken rock mass will produce strong deformation, collapse and caving of surrounding rock is one of the typical common problems in mines. In coal mines have a large number of research results about broken soft rock, but for metal mines, due to the particularity and complexity of its lithology, uncertainty of the deep geological structure, it's makes the research in this aspect does not have a set of mature theoretical system and convincing means to solve the problem on engineering. Broken soft rock is one of the hotspots and difficulties of underground engineering research, attracted widespread attention of scholars at home and abroad.

2 THE CLASSIFICATION OF SOFT ROCK

On the basis of summarizing the predecessors' concept of soft rock (He & Jing 2002, Gou & Hou 2000, He 1997, Zhang & Wang 2005, Milton 2014, Kimikazu & Tetsuya 2013), He Manchao, etc. classifying soft rock into geological soft rock and engineering soft rock, think engineering soft rock is refers to the engineering rock mass that can produce significant plastic deformation under the action of engineering acting forces.

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