We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Study on the Time-lag Failure of Sandstone With Different Degrees of Unloading Damage.
- Authors
Qiao Jiang; Jianlin Li; Zuosen Luo; Xiaoliang Xu; Assefa, Eleyas; Huafeng Deng
- 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 timelag 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.
- Subjects
SANDSTONE; ROCK excavation; RENORMALIZATION group; GROUP theory; UNDERGROUND construction
- Publication
Periodica Polytechnica: Civil Engineering, 2019, Vol 63, Issue 1, p206
- ISSN
0553-6626
- Publication type
Article
- DOI
10.3311/PPci.13260