Experimental Study on Accumulative Deformation Characteristics of Tunnel Slag Under Cyclic Dynamic Loading Considering Particle Breakage Effect
To support the green and low-carbon construction of transportation infrastructure,tunnel debris is often used as roadbed filling material for resource utilization.By conducting large-scale triaxial cyclic dynamic load tests and particle uniaxial compression tests,the mechanical characteristics evolution law of slag with different moisture content under long-term traffic loading was explored.In addition,the study investigated both the particle breakage of slag and the characteristic strength of its primary rock component particles.The cyclic triaxial test results show that high moisture content significantly increases the cumulative plastic deformation and volumetric strain of the slag material,while the rebound modulus appreciably decreases.The relationship curve between axial strain cumulative rate and cycles number exhibits a distinct attenuation and stabilization stage,with an appreciably increase in the accumulation rate during the later stages of loading for high moisture content samples.Analysis of the particle size distribution curves before and after testing reveals that cyclic loading results in significant breakage of the slag particles,with the degree of breakage increasing with higher sample moisture content.Uniaxial compression tests on particles of tuff,sandstone,and sandy mudstone particles in the slag indicate that increasing saturation leads to a decrease in the characteristic strength of individual particles,with sandy mudstone exhibiting the most significant decrease in characteristic strength.Based on the experimental results,a correlation expression between slag breakage rate and final cumulative strain was established,allowing for the reasonably prediction of the evolutionary patterns of particle breakage in slag materials under long-term traffic loading.
subgrade engineeringtunnel slagtriaxial testaccumulative deformationsoft rock particlesparticle breakage
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