Fractures and Acoustic Emission Features of Non-persistent Jointed Rocks Subjected to Freeze-Thaw-Compression Load: Experimental Insights

被引：32

作者：

Qiao, Chen ^{[1
,2
]}

Song, Zhengyang ^{[1
,2
]}

Wang, Yu ^{[1
,2
]}

Tannant, Dwayne ^{[3
]}

Li, Changhong ^{[1
,2
]}

机构：

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

[2] Univ Sci & Technol Beijing, Minist Educ, Key Lab High Efficient Min & Safety Met Mines, Beijing 100083, Peoples R China

[3] Univ British Columbia, Sch Engn, Kelowna, BC V1V 1V7, Canada

来源：

ROCK MECHANICS AND ROCK ENGINEERING | 2022年 / 55卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Freeze-thaw cycles; Non-persistent joints; Rock bridge; Fracture evolution; Acoustic emission; MECHANICAL-PROPERTIES; CRACK INITIATION; BEARING CAPACITY; COALESCENCE; SANDSTONE; STRENGTH; DAMAGE; CYCLES; DEGRADATION; PROPAGATION;

D O I：

10.1007/s00603-021-02667-w

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Rock mass containing central locked segments is susceptible to freeze-thaw weathering and could result in rock instability and even serious geological hazards. This work conducts uniaxial compression and acoustic emission synchronization tests to experimentally investigate the rock bridge deformation and failure characteristics of central locked samples drilled from plateaus in China. The influences of freeze-thaw cycles and rock bridge angle on the fracturing and acoustic emission pattern were characterized. Results show that the physical and mechanical parameters deteriorate in varying degrees with the increase of freeze-thaw cycles. The compression stress curves display as fluctuation trend and multiple stress drops, indicating that the rock bridge improves the plastic properties of samples. The points of stress drops are in good agreement with sudden increment of acoustic emission count curve. The acoustic emission count and released acoustic emission energy decrease with the increase of freeze-thaw cycles. The damage model established based on acoustic emission parameters reflects the process of crack propagation and coalescence of central locked sample subjected to freeze-thaw cycles during uniaxial compression. Damage variable evolution rate decreases with increasing of freeze-thaw cycles. The damage evolution rate and the associated crack growth rate is the smallest for a rock with bridge angle of 30 degrees.

引用

页码：109 / 123

页数：15