Influence of Loading Rate on the Energy Evolution Characteristics of Rocks under Cyclic Loading and Unloading

Jielin Li, Liu Hong, Keping Zhou, Caichu Xia and Longyin Zhu
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Jielin Li: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Liu Hong: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Keping Zhou: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Caichu Xia: Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing 312000, China
Longyin Zhu: School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Energies, 2020, vol. 13, issue 15, 1-16

Abstract: To analyse the effect of loading rate on the energy evolution of rocks under cyclic loading and unloading, tests on saturated limestone were conducted at loading rates of 0.15, 0.2, and 0.3 mm/min, and the evolution characteristics of plastic, elastic, dissipation, and input energies were examined under different loading rates. The results indicated that the plastic strain in the entire test was directly proportional to the loading rate. In addition, strength, residual stress, plastic energy, and dissipation energy under residual resistance were inversely proportional to the loading rate. The plastic strain exhibited a decreasing–stabilising–increasing trend, and the smaller loading rate delayed the “increasing” trend. The increasing extent of each energy exhibited the following trend: input > elastic > plastic > dissipation energy. Furthermore, the first three types of energy exhibited a slow–fast–slow–fast increase trend. The dissipation energy exhibited a fast–steady–fast–slow–fast increase trend. Additionally, the elastic energy index exhibited a large increase–steady increase–decrease trend, which was proportional to the loading rate. The damping ratio exhibited a decrease–increase–decrease–increase–decrease trend which was proportional to the loading rate in the compaction stage and inversely proportional to the plastic stage.

Keywords: loading rate; cyclic loading and unloading; plastic strain; energy evolution; elastic energy index; damping ratio (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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