Dynamic splitting tensile test of granite under freeze-thaw weathering

被引：49
作者：
Liu, Chuanju [1 ,3 ]
Wang, Daguo [1 ]
Wang, Zhixiu [2 ]
Ke, Bo [3 ]
Li, Ping [1 ]
Yu, Songtao [3 ]
机构：
[1] Southwest Univ Sci & Technol, Sch Environm & Resource Engn, Mianyang 62100, Sichuan, Peoples R China
[2] BGRIMM Technol Grp, Beijing 100160, Peoples R China
[3] Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China
来源：
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING | 2021年 / 140卷
基金：
中国国家自然科学基金;
关键词：
Freeze-thaw cycle; NMR; T-2 spectrum distribution; SHPB; Mechanical integrity; ENERGY-DISSIPATION; DAMAGE EVOLUTION; FROST ACTION; ROCK; DETERIORATION; SANDSTONES; STRENGTH; CYCLES;
D O I：
10.1016/j.soildyn.2020.106411
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
To study the influence of freeze-thaw weathering on dynamic tensile properties and damage mechanism of rock material, the porosity and T-2 spectrum distribution of rock samples underwent different freeze-thaw cycles were obtained by nuclear magnetic resonance (NMR), and the variation of micropores and macropore that caused by freeze-thaw cycles were calculated by T-2 spectrum and then analyzed. In addition, the dynamic splitting tensile test was carried out on rock samples by using split Hopkins pressure bar (SHPB), and dynamic tensile peak strength, Young's modulus and peak strain were gained and analyzed. Dynamic tensile strength degradation prediction model was established to predict the damage of rock caused by freeze-thaw weathering. Results show that the porosity of the rock sample increases with freeze-thaw cycles increase, the freeze-thaw damage on rock microstructure is mainly caused by the expansion of micropores into macropores, while the initiation of micropores is the secondary reason. With freeze-thaw cycles increasing, the peak strain increases, the dynamic Young's modulus decreases. In addition, the effect of freeze-thaw weathering deteriorates the rock's anti-deformation ability and durability.
引用
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页数：7
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