Effects of pre-static loads on the dynamic pure mode I and mixed mode I–II fracture characteristics of rocks

Li, Youzhen; Dai, Feng; Liu, Yi; Wei, Mingdong

doi:10.1016/j.engfracmech.2023.109047

Cited by 14 publications

(1 citation statement)

References 63 publications

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“…They revealed that the mechanical properties of rocks under different strain states could be relatively distinguished from their quasi-static ones. Importantly, Li et al (2022Li et al ( , 2023 evaluated the transient propagation mode I-fracture properties of rocks under prestatic and dynamic loadings. Their results indicated that both the dynamic and the total fracture toughness reveal apparent rate sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Development and applications of the quasi‐dynamic triaxial apparatus for deep rocks

Luo,

Cai,

et al. 2023

Deep Underground Science and Engineering

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The mechanical behaviors of deep rocks have always posed a challenge for the implementation and safe operation of major underground engineering projects. To this end, this study modified the existing mainstream rock mechanics instruments equipped with a dynamic disturbance loading system and developed a second‐generation TFD‐2000/D triaxial instrument. The first‐generation device is equipped with an independent disturbance system and an advanced EDC‐580 all‐digital servo controller, which can apply disturbing load independently, implement the function of cyclic disturbance, and combine dynamic and static disturbances. The instrument was found to be reliable for use in analyzing the damage process of rocks in the disturbance test of marbles. The second‐generation instrument tackles three limitations of the first‐generation instrument: (i) it upgrades the strain measurement system and uses extensometers with linear variable differential transformers to accurately measure deformation; (ii) it uses the self‐balanced chamber to replace the Hoek–Franklin triaxial cell and auto‐balancing triaxial pressure chamber; and (iii) the loading rod is independently equipped with an EDC‐580 all‐digital servo controller, which measures precise loads. The experimental findings confirmed that the second‐generation instrument can be used for rock mechanics testing under cyclic disturbance loading, the disturbance–stress relaxation cycle, and the creep–fatigue cycle. In this sense, the second‐generation instrument can be a useful addition to deep rock mechanical instruments and provide a valuable reference.

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Section: Introductionmentioning

confidence: 99%