Quantitative Evaluation of Rock Brittle Property Based on Energy Evolution and Its Application in Three Gorges Reservoir Area

Tao Wen; Yankun Wang; Tang Huiming

doi:10.1007/s12583-022-1636-y

Volume 35 Issue 6

Dec 2024

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Journal of Earth Science > 2024 > 35(6): 2013-2029.

Tao Wen, Yankun Wang, Tang Huiming. Quantitative Evaluation of Rock Brittle Property Based on Energy Evolution and Its Application in Three Gorges Reservoir Area. Journal of Earth Science, 2024, 35(6): 2013-2029. doi: 10.1007/s12583-022-1636-y

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Tao Wen, Yankun Wang, Tang Huiming. Quantitative Evaluation of Rock Brittle Property Based on Energy Evolution and Its Application in Three Gorges Reservoir Area. Journal of Earth Science, 2024, 35(6): 2013-2029. doi: 10.1007/s12583-022-1636-y

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Quantitative Evaluation of Rock Brittle Property Based on Energy Evolution and Its Application in Three Gorges Reservoir Area

doi: 10.1007/s12583-022-1636-y

Tao Wen^{1, 3
,},
Yankun Wang^{1
,
,
,},
Tang Huiming^{2
,
,
,}

1.
School of Geosciences, Hubei Key Laboratory of Complex Shale Oil and Gas Geology and Development in Southern China, Yangtze University, Wuhan 430100, China
2.
Badong National Observation and Research Station of Geohazards, China University of Geosciences, Wuhan 430074, China
3.
Anhui Institute of Intelligent Underground Detection Technology, Hefei 230601, China

More Information

Corresponding author: Yankun Wang, ykwang@yangtzeu.edu.cn; Huiming Tang, tanghm@cug.edu.cn
Received Date: 05 Sep 2022
Accepted Date: 17 Dec 2022

Available Online: 26 Dec 2024

Issue Publish Date: 30 Dec 2024

Abstract

Abstract

Brittleness is of great significance for evaluating the mechanical properties of the slope rock in reservoir area and revealing the brittle failure mechanism of the rocks. Although a series of definitions of the brittleness and evaluation methods of brittleness index have been proposed, there is still lack of a widely recognized and remarkable standards in these aspects due to the differences in diagenetic process, depositional environment and mineral composition. The previous methods to quantitively estimate the rock brittleness based on energy balance analysis are summarized, which neglect multiple influencing factors of the rock brittleness, such as the weight of pre-peak or post-peak mechanical behaviors on the prediction performance of the brittleness index. Based on the typical curves about stress and strain, the relationships between the brittle failure behaviors and the energy evolutions are comprehensively analyzed, then a new method for assessing the brittleness is proposed. Based on pre-peak brittleness index to represent brittle property at pre-peak stage and post-peak brittleness index to determine brittle characteristic at post-peak stage, a new brittleness index is established by additive synthesis method in consideration of the weight of brittleness indexes before and after peak strength, and either of the two brittleness indexes can be punished or compensated by setting different parameter values. The results indicate that the proposed brittleness index can represent the brittle change laws for different rock types when α ≤ 0.5, β ≥ 0.5. When evaluating the brittleness of the slope rock in Three Gorges Reservoir (TGR) area, the results show that the rock brittleness in the slope affects the stability of the slope. Therefore, the novel evaluation method can provide reliable results, and the proposed brittleness index considering the energy evolution can be applied to assess the brittle property in the reservoir bank project.
- rocks,
- brittleness index,
- complete stress-strain curve,
- deformation and failure,
- energy evolution,
- slope stability,
- engineering geology

Conflict of Interest
The authors declare that they have no conflict of interest.

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References(50)

References

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Quantitative Evaluation of Rock Brittle Property Based on Energy Evolution and Its Application in Three Gorges Reservoir Area

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