In:
Periodica Polytechnica Civil Engineering, Periodica Polytechnica Budapest University of Technology and Economics, ( 2019-01-16)
Abstract:
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.
Type of Medium:
Online Resource
ISSN:
1587-3773
,
0553-6626
Language:
Unknown
Publisher:
Periodica Polytechnica Budapest University of Technology and Economics
Publication Date:
2019
detail.hit.zdb_id:
2045172-6
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