Experimental research of fracture damage behavior of loess with different prefabricated cracks

被引：9
|
作者：
Duan, Zhao [1 ,2 ]
Dong, Chenxi [1 ,2 ]
Yan, Xusheng [1 ,2 ,3 ]
Sun, Qiang [1 ]
Li, Bin [4 ]
机构：
[1] Xian Univ Sci & Technol, Coll Geol & Environm, Xian 710054, Peoples R China
[2] Xian Univ Sci & Technol, Inst Ecol Environm Restorat Mine Areas West China, Xian 710054, Peoples R China
[3] Tongji Univ, Key Lab Geotech & Underground Engn, Minist Educ, Shanghai 200092, Peoples R China
[4] Qinghai Prov Third Nonferrous Geol Explorat Inst, Xining 810000, Qinghai, Peoples R China
来源：
ENGINEERING FRACTURE MECHANICS | 2022年 / 275卷
基金：
中国博士后科学基金;
关键词：
Loess; Fracture toughness; Fracture damage; Crack evolution; Acoustic emission; TOUGHNESS; IDENTIFICATION; LANDSLIDES; THICKNESS; MECHANISM;
D O I：
10.1016/j.engfracmech.2022.108849
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Fracture damage in loess poses a significant threat to the safety of loess-based infrastructure in the China Loess Region. To investigate the fracture damage behavior of loess, three-point bending tests were performed on semi-circular loess specimens containing cracks prefabricated at four angles relative to the loading direction. High-speed photography and acoustic emission moni-toring were used to record the fracture damage process. Mechanical strength, crack evolution and acoustics emission signals were investigated in relation to prefabricated crack angles. Based on the results, a fracture damage mechanism for loess was obtained. This paper provides an in-depth understanding of the fracture damage behavior of loess, and a meaningful reference for the prevention and control of geo-crises caused by cracking.
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收藏
页数：13
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