|Table of Contents|

Study on dynamic mechanical properties of phyllite under water-temperature cycle conditions(PDF)

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

Issue:
2023年06期
Page:
157-169
Research Field:
岩土工程
Publishing date:

Info

Title:
Study on dynamic mechanical properties of phyllite under water-temperature cycle conditions
Author(s):
WANG Lianhua1; 2;  FENG Weizhi1;  WANG Jingli1
(1. College of Engineering and Technology, Jilin Agricultural University, Changchun 130118, Jilin, China; 2.China Railway 23rd Bureau Group Corporation Limited, Chengdu 610031, Sichuan, China)
Keywords:
phyllite;  split Hopkinson press bar test;  temperature cycle;  dry-wet cycle;  dynamic mechanical property
PACS:
TU45
DOI:
10.19815/j.jace.2023.10064
Abstract:
The phyllite with 0° bedding dip angle was subjected to 1, 3, 5, 8, 11 times of deterioration treatment under three water temperature deterioration conditions of temperature cycle natural cooling, temperature cycle cold water cooling and dry-wet cycle, respectively. Then the dynamic characteristics of phyllite under water temperature cycle were studied by using the split Hopkinson press bar(SHPB)test system. The results show that the temperature cycle will effectively shorten the yield stage of the stress-strain curve of phyllite, and the yield stage of phyllite is more obvious under the dry-wet cycle condition, and the ductility is enhanced after the coupling of water temperature. The dynamic peak compressive strength of phyllite decreases with the increase of the number of water temperature cycles, which obeys the negative exponential distribution law. The decrease of peak compressive strength of phyllite under the coupling effect of temperature cycle cold water cooling and dry-wet cycle water temperature is greater than that under the temperature cycle natural cooling. The dissipation energy ratio of phyllite increases dynamically with the increase of water temperature cycle times, so the water temperature cycle has an amplification effect on the increase of dissipation energy ratio of phyllite. When the number of water temperature cycles is small, the pressure-induced tensile fracture failure occurs through the bedding plane. With the increase of the number of water temperature cycles, the number of broken pieces of phyllite increases gradually, the size of broken pieces decreases gradually, the fractal dimension increases continuously, and the failure mode gradually changes into the composite failure mode of tension-shear failure. Under the coupling action of water temperature, phyllite is more prone to multi fragment fracture, the average size of phyllite fragments is generally lower.

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Last Update: 2023-12-01