INFLUENCE OF WATER-SOAKING TIME ON THE ACOUSTIC EMISSION CHARACTERISTICS AND SPATIAL FRACTAL DIMENSIONS OF COAL UNDER UNIAXIAL COMPRESSION

被引：9

作者：

Jia, Zheqiang ^{[1
]}

Ren, Li ^{[2
,3
,4
]}

Liu, Qiangying ^{[1
]}

Peng, Yuan ^{[1
]}

Xu, Duo ^{[1
]}

Zha, Ersheng ^{[1
]}

机构：

[1] Sichuan Univ, Coll Water Resource & Hydropower, Chengdu, Sichuan, Peoples R China

[2] Sichuan Univ, Minist Educ, Sch Architecture & Environm, Key Lab Energy Engn Safety & Disaster Mech, Chengdu, Sichuan, Peoples R China

[3] Sichuan Univ, Coll Water Resource & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu, Sichuan, Peoples R China

[4] Sichuan Univ, Sch Architecture & Environm, MOE Key Lab Deep Underground Sci & Engn, Chengdu, Sichuan, Peoples R China

来源：

THERMAL SCIENCE | 2017年 / 21卷

关键词：

water-soaking time; acoustic emission; acoustic emissions counts; acoustic emissions energy; spatial fractal dimension;

D O I：

10.2298/TSCI17S1327J

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The water-soaking time affects the physical and mechanical properties of coals, and the temporal and spatial evolution of acoustic emissions reflects the fracture damage process of rock. This study conducted uniaxial compression acoustic emissions tests of coal samples with different water-soaking times to investigate the influence of water-soaking time on the acoustic emissions characteristics and spatial fractal dimensions during the deformation and failure process of coals. The results demonstrate that the acoustic emissions characteristics decrease with increases in the water-soaking time. The acoustic emissions spatial fractal dimension changes from a single dimensionality reduction model to a fluctuation dimensionality reduction model, and the stress level of the initial descending point of the fractal dimension increases. With increases in the water-soaking time, the destruction of coal transitions from continuous intense failure throughout the process to a lower release of energy concentrated near the peak strength.

引用

页码：S327 / S334

页数：8