Analysis of Macro-Meso Failure Characteristics of CSG Materials Based on DEM Method
[Purposes]This paper aims to investigate the macro-fine mechanical properties and damage characteristics of cemented sand gravel(CSG)materials.[Methods]Indoor uniaxial compression tests were carried out on cemented gravel materials with different water-to-cement ratios(1.5,1.2,and 1.0),and a refined discrete element model(DEM)of CSG was established based on the experimental results,and a macro-fine cross-scale combination of research methods was adopted to investigate the deforma-tion and damage characteristics of CSG materials.[Findings]The study shows that when the water-cement ratio is 1.0,the compressive strength of the specimen is the greatest,and the initial compression-density stage is the shortest.With the continuation of the loading process,the lateral displacement ten-dency of the particles gradually increased,and when entering the crack development stage,the particle velocity vector appeared obvious separating lines,which eventually developed into penetrating cracks.Throughout the loading process,the porosity showed the characteristics of decreasing and then increas-ing.[Conclusions]The results reveal the mechanical properties of CSG materials at different loading stages and the macroscopic and microscopic characteristics during failure damage are revealed.
cemented sand and gravewater-cement ratiodiscrete element methodfine mechanics
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