Research on fractal characteristics and evolution prediction of rock mass deteriorating in bank slope drawdown zone of the Three Gorges Reservoir area

被引：0

作者：

Yan G. ^{[1
,2
,3
]}

Huang B. ^{[2
,3
]}

Yin Y. ^{[4
]}

Hu L. ^{[2
,3
]}

Chen Y. ^{[2
,3
]}

机构：

[1] Faculty of Engineering, China University of Geosciences (Wuhan), Hubei, Wuhan

[2] Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Hubei, Yichang

[3] College of Civil Engineering and - Architecture, China Three Gorges University, Yichang, Hubei

[4] China Institute of Geological Environment Monitoring, Beijing

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 07期

关键词：

crushing phase transition time; evolution prediction; fractal theory; rock mass deterioration; Three Gorges Reservoir area;

D O I：

10.19762/j.cnki.dizhixuebao.2022052

中图分类号：

学科分类号：

摘要：

The key to the deterioration of bank slope rock mass in the Three Gorges Reservoir area lies in the continuous expansion of rock mass joints. The fractal theory is used to study the deterioration degree, deterioration crushing phase transition time, and development trend of the bank slope measuring window rock mass in the upper and lower drawdown zone. The main conclusions are as follows: the distribution of rock mass joint deterioration has fractal properties, and the steep and gentle turning point of the Λ(r) curve can be regarded as the lower limit of the REV rock mass size. On the whole, deterioration makes the growth of rock mass joints develop to a more uniform and denser trend, showing the characteristics of dimension increase. Further, the deterioration classification standard is established by using the joints fractal dimension increment ΔDb. Fractal dimension increment value ΔDb, the increment of area joint number ΔJov, and the variation of geological strength index ΔGSI satisfy the exponential function relationship. Finally, two joints fractal dimension deterioration evolution modes are proposed. The corresponding evolution prediction and analysis can be carried out by using calculation formula of rock mass deterioration and crushing phase transition time, and the prediction of rock mass deterioration and crushing phase transition time is based on secant estimation. Due to the high statistical stability of fractal dimension Db, it can meet the needs of engineering applications. This research provides a new method for the investigation of bank slope deterioration degree and the prediction of deterioration evolution in the Three Gorges Reservoir area. © 2023 Geological Society of China. All rights reserved.

引用

页码：2399 / 2407

页数：8

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