Fracture behavior and damage mechanisms of sandstone subjected to wetting -drying cycles

被引：116

作者：

Cai, Xin ^{[1
]}

Zhou, Zilong ^{[1
]}

Tan, Lihai ^{[1
]}

Zang, Haizhi ^{[1
,2
]}

Song, Zhengyang ^{[3
]}

机构：

[1] Cent South Univ, Sch Resources & Safety Engn, Changsha 410010, Hunan, Peoples R China

[2] Univ Newcastle, ARC Ctr Excellence Geotech Sci & Engn, Fac Engn & Built Environm, Callaghan, NSW 2308, Australia

[3] TU Bergakad Freiberg, Geotech Inst, Gustav Zeuner Str 1, D-09599 Freiberg, Germany

来源：

ENGINEERING FRACTURE MECHANICS | 2020年 / 234卷

基金：

中国国家自然科学基金;

关键词：

DYNAMIC FRACTURE; STRAIN-RATE; COMPRESSIVE STRENGTH; TENSILE-STRENGTH; WATER SATURATION; SUGGESTED METHOD; TOUGHNESS; ROCK; DEFORMATION; FAILURE;

D O I：

10.1016/j.engfracmech.2020.107109

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Rocks are usually subjected to cyclic wetting-drying due to the periodical changes in moist condition. To investigate the effect of wetting-drying cycles on the fracture behavior of sandstone, notched semi-circular bending tests were performed on sandstone samples after every ten cycles (a total of 50 cycles) under both quasi-static and dynamic loading conditions. Tests results indicate that both of fracture toughness and energy dissipation of sandstone significantly decrease with the increase of cycle number. Moreover, the microstructural characteristics reveal that after cyclic wetting-drying treatments, the calcite cementation between grains gradually dissolves and the density and width of inter-granular fracture increase, which could be responsible for the deterioration of rock mechanical properties. © 2020 Elsevier Ltd

引用

页数：15

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