首页|Performances of fissured red sandstone after thermal treatment with constant-amplitude and low-cycle impacts

Performances of fissured red sandstone after thermal treatment with constant-amplitude and low-cycle impacts

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In the engineering practices,it is increasingly common to encounter fractured rocks perturbed by temperatures and frequent dynamic loads.In this paper,the dynamic behaviors and fracture charac-teristics of red sandstone considering temperatures(25 ℃,200 ℃,400 ℃,600 ℃,and 800 ℃)and fissure angles(0°,30°,60°,and 90°)were evaluated under constant-amplitude and low-cycle(CALC)impacts actuated by a modified split Hopkinson pressure bar(SHPB)system.Subsequently,fracture morphology and second-order statistics within the grey-level co-occurrence matrix(GLCM)were examined using scanning electron microscopy(SEM).Meanwhile,the deep analysis and discussion of the mechanical response were conducted through the synchronous thermal analyzer(STA)test,numerical simulations,one-dimensional stress wave theory,and material structure.The multiple regression models between response variables and interactive effects of independent variables were established using the response surface method(RSM).The results demonstrate the fatigue strength and life diminish as temperatures rise and increase with increasing fissure angles,while the strain rate exhibits an inverse behavior.Furthermore,the peak stress intensification and strain rate softening observed during CALC impact exhibit greater prominence at increased fissure angles.The failure is dominated by tensile damage with concise evolution paths and intergranular cracks as well as the compressor-crushed zone which may affect the failure mode after 400 ℃.The second-order statistics of GLCM in SEM images exhibit a considerable dependence on the temperatures.Also,thermal damage dominated by thermal properties controls the material structure and wave impedance and eventually affects the incident wave intensity.The tensile wave reflected from the fissure surface is the inherent mechanism responsible for the angle effect exhibited by the fatigue strength and life.Ultimately,the peak stress intensification and strain rate softening during impact are determined by both the material structure and compaction governed by thermal damage and tensile wave.

Red sandstoneTemperatureFissureConstant-amplitude and low-cycle(CALC)impactFatigue failureResponse surface method(RSM)

Yongjun Chen、Tubing Yin、P.G.Ranjith、Xibing Li、Qiang Li、Dengdeng Zhuang

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School of Resources and Safety Engineering,Central South University,Changsha,410083,China

Department of Civil Engineering,Monash University,Melbourne,3800,Australia

Oulu Mining School,University of Oulu,Oulu,FI-90014,Finland

National Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities of Central South UniversityChina Scholarship Council

419722832021zzts0287202206370109

2024

10.1016/j.jrmge.2023.04.023

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(2)
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