STUDY ON CLASSIFICATION OF DANGEROUS ROCKMASS FAILURE MODES

In recent years, the control of dangerous rockmass in Chongqing region showed that current classification scheme of dangerous rockmass lacked unified definition and connotation, thus easily leading to confusion and controversy, and meanwhile, difficult classification of some dangerous rockmass. Directing at the deficiencies of current classification scheme of dangerous rockmass, this thesis, based on the analysis and summary of domestic chief classification scheme of dangerous rockmass, studied the problem of classification scheme of dangerous rockmass combining with the investigation results of typical accidents of dangerous rockmass slumping happening in recent years. Firstly, according to the initial movement mode of dangerous rockmass failure, it divided dangerous rockmass into such six modes as toppling, sliding, shearing, overhanging, subsiding and falling with 11 subclasses based on differences of combination characteristics of fissure and influencing factors; Secondly, it conducted a detailed definition, location and characteristics of controlling fissure, formation conditions and influencing factors, deformation mechanism, and finally, it analyzed and explained them integrating with typical cases of dangerous rockmass slumping. As the new classification of dangerous rockmass was inclusive, clearly defined and specified as well as highly practical, it could effectively guide the exploration and evaluation, monitoring and forecasting, control of dangerous rockmass.