Study on the Mechanism of Dynamic Size Effect on the Strength of Sandstone

Luo Yi; Qi Chengzhi; Sheng Zhigang; Wang Zefan; Zhao Fa

doi:10.20174/j.JUSE.2024.05.04

Chinese Journal of Underground Space and Engineering >

2024 , Vol. 20 >Issue 5: 1442 - 1453

DOI: https://doi.org/10.20174/j.JUSE.2024.05.04

Study on the Mechanism of Dynamic Size Effect on the Strength of Sandstone

Luo Yi ,
Qi Chengzhi ,
Sheng Zhigang ,
Wang Zefan ,
Zhao Fa

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1. Beijing Future Urban Design Advanced Innovation Center, Beijing University of Civil Engineering and Architecture, Beijing 100044, P.R. China;
2. Beijing International Cooperation Base for Urban Transport Infrastructure Construction, Beijing University of Civil Engineering and Architecture, Beijing 100044, P.R. China;
3. Faculty of Civil Engineering, Institute of Disaster Prevention, Beijing 101601, P.R. China;
4. Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, P.R. China

Received date: 2024-02-05

Online published: 2024-10-31

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Abstract

Experimental studies show that the dynamic size effect is opposite to the static size effect of rock strength, but the intrinsic micro-dynamic mechanism of the dynamic size effect of rocks has not been clarified yet. In this paper, sandstone sample is selected as the research object, and based on the wing-crack model of rock, the crack motion equation and loading equation of sample are jointly calculated, the mechanism of rock specimen size on strength under dynamic loading, namely the dynamic size effect of rock strength is analyzed. The results show that: Under the same dynamic loading rate, with the larger the specimen size, more time is required for crack coalescence, and the applied stress at the moment of the specimen failure (dynamic strength) is greater, the dynamic size effect is more evident, and the rock dynamic strength increases with strain rate approximately in a power law; The critical strain rate range at a definite size range of specimen of rock is obtained by numerical calculation, and the static size effect takes the dominant position when the strain rate is below the critical strain rate, while the dynamic size effect dominates when the strain rate is above the critical strain rate, and the critical strain rate decreases with the increase of specimen size; The critical size of the specimen decreases with the increase of the strain rate.

Key words： dynamic size effect; wing-crack model; dynamic strength; critical strain rate

Cite this article

Luo Yi , Qi Chengzhi , Sheng Zhigang , Wang Zefan , Zhao Fa . Study on the Mechanism of Dynamic Size Effect on the Strength of Sandstone[J]. Chinese Journal of Underground Space and Engineering, 2024 , 20(5) : 1442 -1453 . DOI: 10.20174/j.JUSE.2024.05.04

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