|Table of Contents|

Study on anisotropy characteristics and stress expansion law of layered slate(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年04期
Page:
136-145
Research Field:
岩土工程
Publishing date:

Info

Title:
Study on anisotropy characteristics and stress expansion law of layered slate
Author(s):
XI Jiami1; 2;  GOU Longping1;  WANG Lei1;  YUAN Xinlei1
(1. College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China; 2. College of Architectural Engineering, Yan'an University, Yan'an 716000, Shaanxi, China)
Keywords:
layered slate;  anisotropy;  triaxial compression test;  initiation stress;  expansion stress
PACS:
TU452
DOI:
10.19815/j.jace.2023.10073
Abstract:
In order to explore the anisotropic mechanical characteristics and failure mechanism of layered slate, and to reveal the influence of strata inclination angle and confining pressure on rock expansion, conventional triaxial compression tests of slate with different strata inclination angles were carried out. The results show that the presence of weak strata surfaces has a great influence on the stress-strain curve characteristics of slate, and the stress-strain curve of specimen with strata inclination angle α=90° is most significantly affected by confining pressure. The peak intensity of slate is distributed in a “U” shape with the strata inclination angle, and the confining pressure significantly reduces the degree of strength anisotropy of slate. The elastic modulus and Poisson's ratio shows the characteristics of deformation anisotropy with different strata inclination angles, and the elastic modulus is positively correlated with confining pressure, but the degree of elastic anisotropy is not greatly affected by confining pressure. The failure mode of slate has anisotropy, and the typical characteristics of failure are failure along the strata plane and through the strata plane, and the presence of weak strata surface controls the failure mode of sample. The initiation stress and expansion stress of layered slate have anisotropic characteristics with the strata inclination angle, and the influence of confining pressure on initiation stress is much greater than the influence on peak stress. Under the same stress level, when the strata inclination angle is 60°, the strength of specimen is the lowest, the cracking stress level is the highest, the expansion stress level is close to 1, and the brittle failure occurs immediately when the specimen is not expanded.

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Last Update: 2025-07-10