EXPERIMENTAL STUDY ON THE SOFTENING CHARACTERISTICS OF ARGILLACEOUS SLATE W ITH WATER
DOI:
https://doi.org/10.14311/CEJ.2017.04.0043Keywords:
A rgillaceous S late, T unnel S urrounding R ock, C ompression T est, W ater R ationality, M echanical P ropertiesAbstract
Because the stratification of argillaceous slate developed well, the anisotropy is o
bvious and
it is easy to soften when encountering water, in the excavation, tunnel is easy to cause large
deformation and collapse. In order to understand the softening mechanism of argillaceous slate in
water and mechanical anisotropy and to provide refer ence for solving practical engineering
problems, in this paper, introducing a n argillaceous slate highway tunnel project in Zixi County of
Jiangxi province By preparing standard specimens in field sampling, the mineral composition
analysis, water rationa l test and uniaxial compression test were carried out. The result shows: The
main mineral composition of argillaceous slate is sericite, inclusion of a few chlorite, quartz and so
on. This composition makes obvious characteristics of soft rock. The influence of hydration on the
mechanical properties of argillaceous slate is large. With the increase of water content, the peak
strength shows a downward trend, while the Poisson ratio shows the characteristics of slow growth.
At the same time, the mecha nical properties of argillaceous slate are obviously anisotropic by the
direction of stratification plane. The failure modes of argillaceous slate mainly include axial tension,
local shear failure and shear failure along the stratification plane.
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