Simulation of Fracturing Process in Double-Laminated Beams Based on the Potential Contact Continuum-Discontinuum Method
Weakly bonded rock layers are prone to sliding and delamination,causing geological haz-ards.To test the self-developed unbonded laminated beam model based on the potential contact contin-uum-discontinuum method and obtain a deeper understanding of its mechanical behavior after failure,a study was conducted in three-point bending double-laminated beams,examining the influence of the normal stiffness coefficient in the potential contact force solution.By stacking two rock layers togeth-er,a laminated beam model was established,where embedding occurred between the two layers,re-sulting in interactive potential contact forces.By changing the stacking order of individual beams,lami-nated beams with sandstone on top and mudstone on the bottom and laminated beams with mudstone on top and sandstone on the bottom were formed.In addition to examining the load-displacement curves and maximum principal stress contour maps,the evolution of the number of crack segments was also studied to better understand the complex mechanical behavior of the laminated beams.The research results indicated that:(1)The load-displacement curves of the double-laminated beams matched the relevant experimental results.(2)The moment of crack appearance in each individual beam of the mudstone-on-top laminated beam occurred later than that in the sandstone-on-top laminat-ed beam;the first hardening and softening stages of the former were longer than those of the latter;the second hardening stage of the former was less pronounced than the latter;the second softening stage of the former was less obvious,showing clear brittleness.(3)For the hard-on-top,soft-on-bottom lami-nated beam,as the normal stiffness coefficient decreased,the displacements corresponding to the first and the second peak loads increased.(4)For the soft-on-top,hard-on-bottom laminated beam,as the normal stiffness coefficient decreased,the load-displacement curve changed from double peaks or mul-tiple peaks to a single peak.
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维普
