XU H L, DU Y, SONG Y M, et al.Theoretical study on uniaxial compressive strength of composite rock considering interlayer interaction[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(6):167-172.

doi:10.16186/j.cnki.1673-9787.2022070007

Received:2022/07/05

Revised:2022/11/28

Published:2023/11/25

Theoretical study on uniaxial compressive strength of composite rock considering interlayer interaction

XU Hailiang, DU Yu, SONG Yimin, AN Dong, ZHU Wanyu, GUO Xu

School of Civil Engineering，North China University of Technology，Beijing 100144，China

Abstract:The influence of interlayer interaction on the uniaxial compressive strength of composite rock is significant.Based on linear Mohr strength criterion，Griffith criterion and Drucker Prague criterion，the uniaxial compressive strength of composite rock is studied.Based on the analysis of interlayer interaction of rock，three kinds of uniaxial compressive strength calculation models of composite rock considering the influence of interlayer interaction are obtained，and the theoretical models are verified by experiments.The results showed that：（1）The interlayer interaction has a significant effect on the uniaxial compressive strength of composite rocks.The interlayer interaction can reduce the strength of high strength rocks and increase the strength of weak strength rocks in both static equilibrium and sliding equilibrium states.（2）The interlayer interaction is affected by the elastic modulus，Poisson's ratio，internal friction Angle and cohesion of each component rock；（3）Comparing the theoretical calculation results with the experimental results，the calculation model error of linear moire strength criterion is only 4%，the calculation model error of Griffith criterion is 113%，and the calculation model error of Drucker Prager criterion is 63%.The linear Moire strength criterion is the most accurate to calculate the uniaxial compressive strength of composite rock.

Key words:linear mohr strength criterion;griffith criterion;drucker prager criterion;compressive strength;uniaxial compression experiment

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