Dependence of Dynamic Tensile Strength of Longyou Sandstone on Heat-Treatment Temperature and Loading Rate

被引:78
作者
Yao, Wei [1 ,2 ]
Xu, Ying [1 ]
Wang, Wei [3 ]
Kanopolous, Patrick [2 ]
机构
[1] Tianjin Univ, Sch Civil Engn, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China
[2] Univ Toronto, Dept Civil Engn, Toronto, ON M5S 1A4, Canada
[3] Shijiazhuang Tiedao Univ, Sch Civil Engn, Shijiazhuang 050043, Hebei, Peoples R China
关键词
SHPB; Longyou sandstone; X-ray Micro-CT; Dynamic tensile strength; Heat treatment; Damage variable; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; THERMAL-DECOMPOSITION; DAMAGE ACCUMULATION; PHYSICAL-PROPERTIES; PROTECTIVE MEASURES; SUGGESTED METHODS; ROCK CAVERNS; STRAIN-RATE; MT; ETNA;
D O I
10.1007/s00603-015-0895-7
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
As a material for famous historical underground rock caverns, Longyou sandstone (LS) may fail under the combination of high loading rate and high temperature. The thermal damage induced by various heat-treatment temperatures (150, 250, 350, 450, 600 and 850 A degrees C) is first characterized by X-ray Micro-computed tomography (CT) method. The damage variable derived from the average CT value for heat-treated LS specimen and reference specimen without heat treatment was used to quantify the thermal damage. The dynamic tensile strengths of these LS samples under different dynamic loading rates (ranging from 24 to 540 GPa/s) were then obtained using the split Hopkinson pressure bar (SHPB) system. The dynamic tensile strength of LS increases with the loading rate at a given heat-treatment temperature, and the tensile strength at the same loading rate decreases with the heat-treatment temperature except for 450 A degrees C. Based on the experimental data, an empirical equation was established to relate the dynamic tensile strength of LS to the loading rate and the heat-treatment temperature.
引用
收藏
页码:3899 / 3915
页数:17
相关论文
共 80 条
[1]   THE INFLUENCE OF MICROCRACK DENSITY ON THE ELASTIC AND FRACTURE MECHANICAL-PROPERTIES OF STRIPA GRANITE [J].
ALM, O ;
JAKTLUND, LL ;
SHAOQUAN, K .
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1985, 40 (03) :161-179
[2]  
[Anonymous], 2005, EXPT ROCK DEFORMATIO, DOI [DOI 10.1007/B137431, DOI 10.1007/3-540-26339-X_7]
[3]  
[Anonymous], 2012, Solid Mechanics and Its Applications
[4]  
[Anonymous], B MIN IND EXP STA
[5]  
[Anonymous], CLAYS CLAY TECHNOLOG
[6]  
[Anonymous], 2001, CHIN J ROCK MECH ENG
[7]  
[Anonymous], 2006, Advances in X-ray Tomography for Geomaterials
[8]   Fracture toughness measurements on igneous rocks using a high-pressure, high-temperature rock fracture mechanics cell [J].
Balme, MR ;
Rocchi, V ;
Jones, C ;
Sammonds, PR ;
Meredith, PG ;
Boon, S .
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, 2004, 132 (2-3) :159-172
[9]  
BIENIAWSKI ZT, 1978, INT J ROCK MECH MIN, V15, P99
[10]   Temperature influence on the physical and mechanical properties of a porous rock: San Julian's calcarenite [J].
Brotons, V. ;
Tomas, R. ;
Ivorra, S. ;
Alarcon, J. C. .
ENGINEERING GEOLOGY, 2013, 167 :117-127