Mechanical analysis and failure modes prediction of composite rock under uniaxial compression

Jianguang Li,Yanchun Wang,Zhuoqun Yu,Jiwei Li,Ziyi Zhou

doi:10.1038/s41598-021-02331-x

Jianguang Li, Yanchun Wang + Show 3 more

Open Access

https://doi.org/10.1038/s41598-021-02331-x

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Journal: Scientific Reports	Publication Date: Nov 24, 2021
Citations: 11	License type: open-access

Affiliation: Qingdao University of Science and Technology

Abstract

Composite rocks are easily encountered in a wide range of geotechnical construction projects. Understanding their mechanical properties and failure modes is very important to ensure project quality and safety. This study conducted a mechanical analysis to assess the stress distribution in composite rock with a horizontal interlayer and predicted the possible failure modes. Uniaxial compression tests were carried out on the composite rock samples to reveal their mechanical properties. It was concluded that a composite rock with a thick interlayer failed more easily than a composite rock with a thin interlayer. Four potential failure modes were related to the internal stress distribution under compression and the differences in deformation capacity and strength among the constituent components. The stress distribution derived from the mechanical analysis could explain the failure mechanism very well. These results verified the validity of the mechanical analysis results and improved understanding of the mechanical properties of composite rock with a horizontal interlayer.

Highlights

Composite rocks are encountered in a wide range of geotechnical construction projects
They found that the Uniaxial compressive strength (UCS) and failure modes of a composite rock with interlayers were significantly affected by the change in dip angles
Based on the above premises, the innovations of this paper can be described as follows: (i) a mechanical modelling analysis approach was used to derive an analytical solution of the stress distribution and to predict the failure modes of composite rocks; (ii) composite rock specimens with different thicknesses of horizontal interlayers were prepared and assessed by using simulated rock materials; and (iii) failure modes derived from the experimental method were compared with those derived from the mechanical modelling analysis approach

Summary

Introduction

Composite rocks are encountered in a wide range of geotechnical construction projects. A mechanical modelling analysis was carried out to estimate the stress distribution and failure modes of the composite rock specimens.

Results

Conclusion