Open AccessExperimental Study on Time-Dependent Deformation of Red-Bed Mudstone
Author(s) -
Qian Zhou,
Ran Deng,
Xin Wang,
Kai Wang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/668/1/012065
Subject(s) - geotechnical engineering , deformation (meteorology) , overburden pressure , geology , creep , failure mode and effects analysis , shear (geology) , deformation mechanism , triaxial shear test , materials science , composite material , petrology , oceanography , microstructure
The time-dependent deformation characteristics of mudstone are the keys to reveal the long-term deformation law, damage, failure mechanism of mudstone, and effective treatment of mudstone diseases. In this study, the influence of confining pressure on the deformation of Mudstone was studied through triaxial tests. Also, the effect of load classification on the aging deformation of red bed mudstone was studied by the creep test. The results indicated that: (1) the time effect on mudstone deformation was obvious; 1h to 10h was the acceleration deformation stage, 10h to 20h was the deceleration deformation stage, and 20h was the stable deformation stage; (2) the deformation characteristics of red bed mudstone were affected by confining pressure, and its peak strength and elastic modulus increased with the increase of confining pressure. There were upper limit value and lower limit value in amplitude variation; (3) in general, mudstone failure occurred when the total strain reached 0.01 to 0.015. The failure mode of mudstone was a shear failure when the graded load was large, and discrete failure when it was small. The main reason was that the rock mass was full of expansion and contraction when the graded load was small. Hence, micro-fractures were more likely to develop.