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| Review on research advance of basic friction angle of rock joints |
| YONG Rui1，2，ZHONG Zhen1，DU Shigui1，2，ZHENG Shuang1，ZHANG Yingying2 |
(1. Department of Civil Engineering，Shaoxing University，Shaoxing，Zhejiang 312000，China；2. Rock Mechanics Institute，Ningbo University，Ningbo，Zhejiang 315211，China)
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Abstract As a basic component of the shear strength of rock joints，the accurate acquisition of the basic friction angle is the prerequisite for evaluating the shear strength of rock joints. Generally，the basic friction angle is considered to be a parameter that can be easily obtained. However，many recent studies have shown that the basic friction angle varies significantly with the nature of the sample，the processing method and the measurement method. This paper summarized the research results of the basic friction angle from the aspects of the shear strength model，the mechanical mechanism，the acquisition method and research trends. The results show that the basic friction angle，involved in most shear strength models，lacks a clear definition and a determination method，and that，in particular，there are few studies on improving and optimizing the shear strength model based on the basic friction property of rock joints. It is generally believed that the mineral compositions and morphological characteristics of rock joints play a decisive role in the mechanical mechanism of the basic friction angle，but the influences of the dilatancy effect and the size effect on the basic friction angle are controversial. Tilt test，direct shear test，push-pull test，triaxial test and rebound test are the main experimental methods for obtaining the basic friction angle，but the reliabilities and the applicable conditions for these methods are still unclear. Alghouth at present the basic friction angle has been studied from the mineral composition and structure，roughness，size effect，sample processing technology，test conditions，etc.，further investigations are needed from the perspectives of petrology，micro-roughness and scale effects. It is also pointed out that there is a research trend of further improving the test methods of the basic friction angle by considering the normal stress，shear rate，temperature and humidity.
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2022, Vol. 41 
