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International Journal of Engineering Technology and Construction, 2020, 1(1); doi: 10.38007/IJETC.2020.010102.

Examination on Brittleness Evaluation Index Based on Energy Evolution of Rock Failure Process

Author(s)

Yingying Fan

Corresponding Author:
Yingying Fan
Affiliation(s)

Hebei GEO University, Shijiazhuang, Hebei, China

Abstract

With the economic development and technological advancement around the world, many people are now considering the development of underground space engineering such as underground buildings, underground parking lots, river crossing tunnels, subways, and deep mine mining. Underground rock masses belong to a class of discontinuous and heterogeneous anisotropic brittle materials. The crustal movement of millions of years makes the internal structure extremely complex. Brittleness is a key mechanical feature of rock and is critical to a variety of engineering practices. Based on the energy evolution of rock failure process, the evolution law of strain energy such as pre-peak dissipation energy and post-peak fracture energy during the transformation from plastic deformation to brittle fracture under compression is analyzed. Combining these two energies, the brittleness evaluation index which can comprehensively reflect the mechanical characteristics before and after rock failure is established. The brittleness characteristics of different rock materials under different confining pressures are evaluated. The fracture morphology of shale under different bedding angles is analyzed. The results show that the brittleness evaluation index established in this paper can simultaneously reflect the difficulty of brittle fracture and the strength of brittleness. It can not only describe the brittleness of different rock materials with confining pressure, but also describe the law of change for shale brittleness index based on bedding dip.

Keywords

Rock Failure, Energy Evolution, Brittleness, Evaluation Index

Cite This Paper

Yingying Fan. Examination on Brittleness Evaluation Index Based on Energy Evolution of Rock Failure Process. International Journal of Engineering Technology and Construction (2020), Vol. 1, Issue 1: 17-28. https://doi.org/10.38007/IJETC.2020.010102.

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