Mechanical Characteristics and Macromicro Damage Evolution of Basalt under Static Compression after High Temperature Water Cooling Cycles

doi:10.11988/ckyyb.20230920

Abstract

Abstract:

Static uniaxial compression tests were conducted on basalt samples using the HUT-106A testing machine to investigate the mechanical properties and macro-micro damage evolution laws of basalt subjected to high-temperature water-cooling cycles. The tests involved water-cooling cycles at three different temperatures (100, 300, and 450 ℃) with varying cycle times (1, 3, 5, and 7 times). The compressive fractures of rock samples were observed using SEM. Results reveal that when temperature remains constant and the number of cycles increases, basalt exhibits deteriorating trends in mass, wave velocity, peak strength, and elastic modulus. The stress-strain curve decelerates, and the suddenness and brittleness of failure weaken, whereas the gradualness and plasticity of deformation enhance. The degree of deterioration is most pronounced after seven water-cooling cycles at 450 ℃. In terms of damage, the macro and micro failure modes of basalt vary with the number of cycles at a constant temperature. After seven water-cooling cycles at 450 ℃, basalt exhibits plastic failure. Under the combined action of high-temperature water-cooling cycles and load, the total damage evolution curve of basalt displays nonlinear evolution characteristics, with the curve gradually decelerating as the number of cycles increases. This indicates that basalt transitions from brittle to plastic behavior with increasing cycle times.

Key words: basalt, high temperature water cooling cycle, static compression mechanical characteristics, macro-micro damage, damage evolution

CLC Number:

TU452岩体力学性质及应力理论分析

QI Wen-chao, CAI Yong-zhi, HE Tong, LIU Lei, PANG Xin. Mechanical Characteristics and Macromicro Damage Evolution of Basalt under Static Compression after High Temperature Water Cooling Cycles[J]. Journal of Changjiang River Scientific Research Institute, 2025, 42(2): 145-154.

Figures/Tables 11

Fig.1 X-ray diffraction pattern of basalt samples

Fig.2 Basalt specimens after high temperature water cooling treatment

Fig.3 High temperature water cooling cycle

Table 1 Physical-mechanical parameters of basalt before and after high temperature water cooling cycles

试样编号	M₁/g	M₂/g	V₁/ (m·s^-1)	V₂/ (m·s^-1)	σ_d/ MPa	E_/ GPa
JY-25	590.3	590.3	4 146	4 146	89.89	8.70
JY-100-1	589.2	588.3	4 136	3 988	83.72	7.36
JY-100-3	588.7	587.4	4 165	3 767	77.60	6.61
JY-100-5	591.5	589.9	4 173	3 630	65.61	5.43
JY-100-7	588.5	586.8	4 109	2 980	51.12	4.07
JY-300-1	591.8	590.7	4 125	3 735	73.78	6.01
JY-300-3	592.6	591.1	4 151	3 217	58.89	4.63
JY-300-5	586.9	585.1	4 166	2 412	37.99	2.95
JY-300-7	593.1	591.1	4 170	1 593	26.97	2.04
JY-450-1	592.4	591.2	4 111	2 911	56.14	4.39
JY-450-3	587.5	585.8	4 106	2 085	39.94	3.05
JY-450-5	587.3	585.3	4 143	1 878	30.12	2.32
JY-450-7	593.8	591.5	4 140	1 123	19.18	1.29

Fig.4 Variation of mass loss rate and P-wave velocity with cycles

Fig.5 Stress-strain curves of basalt after high temperature water cooling cycles

Fig.6 Variation regularity of basalt’s peak strength after high temperature water cooling cycles

Fig.7 Variation regularity of basalt’s elastic modulus after high temperature water cooling cycles

Fig.8 Failure characteristics of basalt samples

Fig.9 SEM images of basalt fracture

Fig.10 Evolution curves of total damage variables

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