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Effects of loading waveforms on rock damage using particle simulation method

Journal of Central South University 2018年第7期25卷 1755-1765页

作者： XIA Ming GONG Feng-qiang Hunan Key Laboratory of Geomechanics and Engineering Safety Xiangtan UniversityXiangtan 411105China College of Civil Engineering and Mechanics Xiangtan UniversityXiangtan 411105China School of Resources and Safety Engineering Central South UniversityChangsha 410083China

The particle simulation method is used to study the effects of loading waveforms （i.e. square, sinusoidal and triangle waveforms） on rock damage at mesoscopic scale. Then some influencing factors on rock damage at the mesoscopic scale, such as loading frequency, stress amplitude, mean stress, confining pressure and loading sequence, are also investigated with sinusoidal waveform in detail. The related numerical results have demonstrated that： 1） the loading waveform has a certain effect on rock failure processes. The square waveform has the most damage within these waveforms, while the triangle waveform has less damage than sinusoidal waveform. In each cycle, the number of microscopic cracks increases in the loading stage, while it keeps nearly constant in the unloading stage. 2） The loading frequency, stress amplitude, mean stress, confining pressure and loading sequence have considerable effects on rock damage subjected to cyclic loading. The higher the loading frequency, stress amplitude and mean stress, the greater the damage the rock accumulated; in contrast, the lower the confining pressure, the greater the damage the rock has accumulated. 3） There is a threshold value of mean stress and stress amplitude, below which no further damage accumulated after the first few cycle loadings. 4） The high-to-low loading sequence has more damage than the low-to-high loading sequence, suggesting that the rock damage is loading-path dependent.

关键词： rock damage failure process crack initiation and propagation loading waveform cycle loading particle simulation method

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Fatigue test setups and analysis methods for asphalt mixture: A state-of-the-art review

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Journal of Road Engineering 2022年第4期2卷 279-308页

作者： Huailei Cheng Lijun Sun Yuhong Wang Liping Liu Xingyu Chen The Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 201804China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina

Fatigue performance evaluation on asphalt mixture provides an essential reference for asphalt mixture design and pavement structure *** fatigue test has been widely used by researchers and engineers to assess the fatigue performance of asphalt mixture,due to its low cost,high efficiency,and strong *** ensure performance assessment reliability,fatigue test operated in the laboratory needs to simulate the loading and environmental conditions occurring in the field asphalt *** a result,loading setups in laboratory fatigue tests,including loading mode,loading frequency,loading waveform,temperature,and the controlled mode,have been carefully devised by *** paper reviews the above common setups in fatigue tests,which aims to illustrate the classical and latest considerations as well as ideas proposed by researchers for improving fatigue test *** fatigue response data of asphalt mixture is measured from fatigue test,an analysis method is required to process the data and identify fatigue behaviors of the ***,the frequently-used fatigue data analysis methods include the fatigue life model,stiffness-modulus-based method,energy-based method,and viscoelastic continuum damage(VECD)*** paper also provides a review survey on the main concepts,indicators,and models included in those methods to facilitate their ***,the latest research progress and outputs related to the four methods are also introduced and discussed to reveal the state-of-the-art developments in this research area.

关键词： Asphalt mixture Fatigue Frequency loading waveform Temperature VECD

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