Microscopic Failure Mechanism of Cement Stabilized Macadam Based on Discrete Element Method
To explore the microscopic composition and failure mechanism of the cement stabilized macadam material,a two-dimensional discrete element model of the cement stabilized macadam was established to invert the microscopic contact parameters by comparison with indoor tests,and the unconfined compressive strength test and four-point bending test of cement stabilized macadam were simulated.It can be seen that the simulation results were close to the indoor test results;the established discrete element model could accurately predict the unconfined compressive strength,elastic modulus,and flexural-tensile strength of cement stabilized macadam.The failure of the cement stabilized macadam material initially occurred at the bonding interface between the cement mortar and aggregate.In the flexural test,the fracture appeared at the bottom of the mid-span of the specimen and developed upwards along the outer contour of the aggregate at an inclined angle,and the fractures were all generated by concentrated tensile stress.
discrete element methodcement stabilized macadammicroscopic researchunconfined compressive strength
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