Abstract: Clay minerals in very weak cemented rock mass are often high in content. Due to the argillaceous cementation, the cementation of this rock is poor and sensitive to water, and has strong plasticity. Based on the principle of soil consolidation and lever loading, an experimental device for regenerative structure formation of very weakly cemented rock mass was developed independently, and the method of graded loading and consolidation stabilization was determined. At the same time, the rock samples of regenerated structure rock mass with very weakly cementation at different moisture ratios were formed, and its formation condition and process was revealed. Uniaxial and triaxial compression tests were performed on the rock samples with different moisture ratios, the deformation laws of the rock samples, and the relationships between strength parameters and stress state and moisture ratio were revealed. The total stress-strain curve characteristics of the structural rock samples were analyzed, and the evolution law of volumetric strain was revealed. By analyzing the failure modes of uniaxial and triaxial compression tests of the rock samples, it was found that the failure modes of the rock samples are greatly affected by moisture ratio of cementation.

Key words: very weakly cemented rock mass, self-developed experimental device, structural reorganization, mechanical properties, failure mode