Mesoscopic surface crack extension mechanism of magnesium slag-based backfill based on digital image correlation
Source abstract
Abstract
The crack development characteristics and deformation evolution laws of magnesium slag-based backfill under uniaxial compression were systematically investigated through uniaxial compression tests combined with digital image correlation technology. The surface scatter images of magnesium slag-based backfill during the loading process were analyzed, and the mesoscopic surface crack extension mechanisms, such as the original destructive morphology, strain field evolution, and displacement field evolution of the backfill surface, were discussed in detail. The results indicate that the failure modes of magnesium slag-based backfill under different curing ages and magnesium slag grinding time exhibit similar shear damage characteristics. The horizontal strain field on the surface of the ground magnesium slag-based backfill displays speckled deformation concentration areas, while the vertical strain field presents continuous gradient deformation localization areas. The distribution of the color fields and the discontinuous displacement values of the cloud diagrams can be used to identify crack paths and assess crack development situation. The sudden change characteristics of the variance of the strain field during the accelerated differentiation stage can be used as a precursor index for predicting the crack propagation of the backfill. The research results can provide a theoretical basis for exploring the fracture mechanism of magnesium slag-based backfill.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Tailings Management and Properties · Rock Mechanics and Modeling · Numerical methods in engineering
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
University of Science and Technology Beijing
Jinchuan Group Co. Ltd
CHEARI (Beijing) Certification & Testing Co. Ltd
Funding
National Natural Science Foundation of China · National Key Research and Development Program of China · Key Program of National Natural Science Foundation of China
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