On fracture and damage evolution modelling of fissure-hole containing granite induced by multistage constant-amplitude variable-frequency cyclic loads

被引：21

作者：

Wang, Yu ^{[1
]}

Cao, Zhaohui ^{[1
]}

Song, Zhengyang ^{[1
]}

Zhu, Chun ^{[2
]}

Han, Jianqiang ^{[3
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Dept Civil Engn, Beijing Key Lab Urban Underground Space Engn, Beijing 100083, Peoples R China

[2] Hohai Univ, Sch Earth Sci & Engn, Nanjing, Peoples R China

[3] Chinese Acad Sci, Inst Acoust, Beijing, Peoples R China

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2022年 / 45卷 / 05期

基金：

北京市自然科学基金; 中国国家自然科学基金;

关键词：

acoustic emission; crack coalescence; cyclic loads; damage modelling; failure mode; FAILURE BEHAVIOR; COALESCENCE MECHANISMS; UNIAXIAL COMPRESSION; SANDSTONE; ROCK; STRENGTH;

D O I：

10.1111/ffe.13663

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This work aims to reveal the fracture the damage evolution characteristics of fissure-holes containing rock under multistage constant-amplitude variable-frequency cyclic loads. Testing results show that the peak strength and fatigue lifetime both increase as the fissure angle increases from 10 degrees to 70 degrees. However, the volumetric deformation, AE activities, and crack network scale get to a maximum for a sample having a 50 degrees fissure angle. More small-sized cracks were formed for rock having a high fissure angle, and the proportion of low-frequency signal is relatively high. A damage evolution model was proposed based on AE rate, and an inverted "S"-shaped curve reflects the damage propagation of the experimental data. Additionally, the highlighted internal crack network reveals the crack coalescence and hole spalling behaviors; three types of rock bridge coalescence modes of single tensile coalescence, double-tensile coalescence, and double shear coalescence were identified.

引用

页码：1332 / 1348

页数：17

共 37 条

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