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Study on the Time-lag Failure of Sandstone With Different Degrees of Unloading Damage

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Medium: Fachartikel
Sprache(n): Englisch
Veröffentlicht in: Periodica Polytechnica Civil Engineering
DOI: 10.3311/ppci.13260
Abstrakt:

The unloading effect of rock mass excavation is an inevitable practice, and it’s often characterized by a relatively large-scale engineering hazard with a noticeable time lag.A set of unloading triaxial tests were conducted on a sandstone rock to establish the deformation law and the threshold time. Based on the renormalization group theory, the unloading sandstone model was developed by considering the interaction between particles. Similarly, a logistic model was used to predict the unloading damage of sandstone. The unloading time lag damage of sandstone rock was predicted by using the damage threshold. The research shows that: (1) The higher the degree of unloading, the shorter the time-lag failure. (2) The damage range of critical values was optimized. (3) The error between the predicted value and the experimental value of the time threshold was almost less than 5 %, the prediction result was found to be good, and the employed logistic evolution model was reasonable. The findings of this research provide a prediction method and precise information about the mechanism of unloading time lag deformation. Therefore, it can be used as a reference for excavation-support design of underground structures.

Structurae kann Ihnen derzeit diese Veröffentlichung nicht im Volltext zur Verfügung stellen. Der Volltext ist beim Verlag erhältlich über die DOI: 10.3311/ppci.13260.
  • Über diese
    Datenseite
  • Reference-ID
    10536511
  • Veröffentlicht am:
    01.01.2021
  • Geändert am:
    19.02.2021
 
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