WEI J,et al.Theoretical analysis and experimental study on the consistency of intact rock deformation parameters under various loading conditions[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(4):123-130.

doi:10.16186/j.cnki.1673-9787.2025120077

Received:2025/12/25

Revised:2026/03/31

Published:2026/06/17

Theoretical analysis and experimental study on the consistency of intact rock deformation parameters under various loading conditions

Wei Jiong1,2

1.CCTEG Coal Mining Research Institute， Beijing  100013， China;2.State Key Laboratory of Intelligent Coal Mining and Strata Control， Beijing  100013， China

Abstract: Objectives To investigate the consistency of intact rock deformation parameters under various loading conditions， a study was conducted based on the generalized Hooke’s Law.  Methods Through theoretical derivation and laboratory tests，the characteristics of rock elastic modulus and Poisson’s ratio were systematically analyzed under three loading conditions： triaxial compression （three-dimensional stress）， Brazilian disc splitting（two-dimensional stress）， and uniaxial compression （one-dimensional stress）.  Results The results indicated that the elastic moduli measured by the three loading methods exhibited high consistency. Compared with the uniaxial compression reference，the relative errors of both triaxial compression and Brazilian disc tests were within 6.1%. It was quantitatively verified that the deformation parameters of intact rock are material constants independent of geometric shape and stress state. In uniaxial compression tests， the method for determining the elastic modulus depended on the calculation approach due to the non-linear characteristics of the stress-strain curve. In contrast， such method-dependent behavior was avoided in triaxial compression and Brazilian disc tests， which yielded more stable results. Furthermore，the consistency of elastic modulus and Poisson's ratio measured by cylindrical and rectangular specimens was demonstrated. This characteristic was attributed not only to the elastic nature of the rock but also to the material geometry and testing theory.  Conclusions These findings provide a basis for the rational selection of rock mechanics parameter testing methods.

Key words:rock mechanics;uniaxial compression;triaxial compression;Brazilian disc;elastic modulus