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| Experimental study on empirical formula of peak shear strength for rock-concrete interface #br# |
| LIU Jianghao1，GUO Baohua1，2，3，CHENG Tan1，SUN Jiehao1，TIAN Shixuan1，CHEN Yan1 |
(1. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454000，China；
2. The Collaborative Innovation Center of Coal Safety Production of Henan Province，Henan Polytechnic University，
Jiaozuo，Henan 454000，China；3. Jiaozuo Engineering Research Center of Road Traffic and Transportation，
Henan Polytechnic University，Jiaozuo，Henan 454000，China) |
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Abstract In order to study the relationship between the shear bearing capacity of the rock-concrete interface and the mechanical properties of rock and concrete，the irregular joint specimens of fine-grained sandstone，silty-grained marble，granite and coarse-grained marble were prepared by using a splitting method，the rock joint morphological parameters were obtained by a three-dimensional topography scanner，and then the rock-concrete interface specimens were made by pouring concrete on the rock joint surface. Finally，direct shear tests were carried out on rock-concrete interface specimens under different normal stresses by using the RDS–200 rock joint shear test system. The results show that the peak shear strength of rock-concrete interface and concrete joint increases with the increase in normal stress，and the former always increases faster than the latter under the same normal stress；the average peak shear strength of the rock-concrete interface has a good exponential correlation with the average pre-peak shear stiffness of rock-concrete interface. With the increase of the difference between the elastic modulus of rock and concrete，the internal friction angle of the rock-concrete interface decreases linearly，the cohesion of the rock-concrete interface increases linearly，and the peak shear bearing mode of the rock-concrete interface gradually changes from the friction bearing mode to the combined bearing mode of friction and cohesion. Therefore，an empirical formula of the peak shear strength of the rock-concrete interface in the form of Mohr-Coulomb criterion is proposed. Based on the power relationship between the concrete wall sharing coefficient in the rock-concrete interface compressive strength and the basic friction angle of rock joint，a new method for determining the rock-concrete interface compressive strength JCSab is proposed，and an empirical formula of peak shear strength of rock-concrete interface in the form of JRC-JCS model is established. Through the comparison and verification between the calculated values and the test values of the peak shear strength of the rock-concrete interface，it is found that the two newly proposed empirical formulas can better predict the peak shear strength of the rock-concrete interface，and the parameters are easy to obtain，which can provide a reference for the estimation of the peak shear strength of the rock-concrete interface in engineering practice.
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2023, Vol. 42 
