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  2023, Vol. 42 Issue (10): 2552-2565    DOI: 10.13722/j.cnki.jrme.2022.1266
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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.
Key wordsrock mechanics      rock-concrete interface      direct shear test      peak shear strength      empirical formula      basic friction angle
     
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Articles by authors
LIU Jianghao1
GUO Baohua1
2
3
CHENG Tan1
SUN Jiehao1
TIAN Shixuan1
CHEN Yan1
Cite this article:   
LIU Jianghao1,GUO Baohua1,2, et al. Experimental study on empirical formula of peak shear strength for rock-concrete interface #br#[J]. , 2023, 42(10): 2552-2565.
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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1266      OR      https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I10/2552
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