Study on the shear strength model of rock joints considering the influence of non-stationary trend

被引：0
|
作者：
Liu W. [1 ]
Wang C. [1 ,2 ]
Zhang X. [3 ]
Yong R. [1 ]
Luo Z. [1 ]
Du S. [1 ]
机构：
[1] Institute of Rock Mechanics, Ningbo University, Zhejiang, Ningbo
[2] The Engineering Research Center of Rock-Soil Drilling and Excavation and Protection, Ministry of Education, China University of Geosciences(Wuhan), Hubei, Wuhan
[3] Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Liaoning, Shenyang
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷 / 02期
基金：
中国国家自然科学基金; 浙江省自然科学基金;
关键词：
direct shear test; non-stationary trend; rock joints; rock mechanics; roughness; shear strength;
D O I：
10.13722/j.cnki.jrme.2022.0579
中图分类号：
学科分类号：
摘要：
The existence of the non-stationary trend of rock joint(the angle between the rock joint and the shear plane) directly affects the accuracy of the shear strength evaluation of the rock joint specimen. The existing shear strength calculation models do not consider the influence of the non-stationary trend of rock joint and are not suitable for the calculation of the shear strength of the rock joint with non-stationary trend. To do this，this paper quantitatively characterizes the trend directionsα and β of the rock joint(α and β representing the inclination angle of the rock joint along the shearing direction and the deflection angle of the rock joint perpendicular to the shearing direction). The least square fitting plane of the rock joint is taken as the reference plane，the external normal and tangential stresses are decomposed into the normal and tangential stresses of the reference plane，a shear strength model of the rock joint considering the influence of non-stationary trend is established based on this. The numerical solution of the model is calculated by numerical analysis method，and the accuracy of the numerical solution is verified by direct shear test. The research results show that the shear strength of rock joint is mainly controlled by the trendα ，while the influence of the trend β on the shear strength is less than 1.5%，which can be ignored in the calculation；The upper and lower error limits between the improved value of shear strength and its prototype value increase with the increase of the normal stress and the three-dimensional roughness JRC3D of the rock joint；Compared with the shear strength model without considering the influence of non-stationary trend，the accuracy of the shear strength calculated by the improved model is increased by 24.45%，23.693%，25.37% and 14.504% respectively，the proposed shear strength model can effectively evaluate the shear strength of the rock joint specimen with non-stationary trend，which lays a theoretical foundation for the evaluation of shear strength of rock joint. © 2023 Academia Sinica. All rights reserved.
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页码：378 / 390
页数：12
相关论文
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