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| Study on the shear strength model of rock joints considering the influence
of non-stationary trend |
| LIU Weiming1，WANG Changshuo1，2，ZHANG Xiwei3，YONG Rui1，LUO Zhanyou1，DU Shigui1
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| (1. Institute of Rock Mechanics，Ningbo University，Ningbo，Zhejiang 315211，China；2. The Engineering Research Center
of Rock-Soil Drilling and Excavation and Protection，Ministry of Education，China University of Geosciences(Wuhan)，
Wuhan，Hubei 430074，China；3. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines，
Northeastern University，Shenyang，Liaoning 110819，China)
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Abstract 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 directions and of the rock joint( and 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 trend ，while the influence of the trend 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.
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2023, Vol. 42 
