Investigation on the Linear Energy Storage and Dissipation Laws of Rock Materials Under Uniaxial Compression

2019 ◽  
Vol 52 (11) ◽  
pp. 4237-4255 ◽  
Author(s):  
Fengqiang Gong ◽  
Jingyi Yan ◽  
Song Luo ◽  
Xibing Li
Keyword(s):  
Energy Storage ◽  
Uniaxial Compression ◽  
Rock Materials

scholarly journals Experimental Study on Energy Evolution and Storage Performances of Rock Material under Uniaxial Cyclic Compression

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Fengqiang Gong ◽  
Jingyi Yan ◽  
Yunliang Wang ◽  
Song Luo
Keyword(s):  
Energy Storage ◽  
Cyclic Loading ◽  
Uniaxial Compression ◽  
Input Energy ◽  
Storage Coefficient ◽  
Rock Materials ◽  
Cyclic Loading And Unloading ◽  
Total Input ◽  
Loading And Unloading ◽  
And Storage

To investigate the energy evolution and storage performances of rock under uniaxial cyclic compression, a series of uniaxial cyclic loading and unloading compression tests were conducted on Green sandstone and Yueyang granite. Two methods for calculating the total input energy of the specimen under each cycle were proposed. One is based on the actual stress-strain curve of the specimen (ASC method); the other is based on the stress-strain envelope curve during the loading process (SEC method). The experimental results show that, for those two methods, the total input energy, elastic energy, and dissipated energy of the specimen show a quadratic function increasing trend with the increase of stress levels. Besides, the elastic energy increases linearly with the increase of total input energy for both methods, which confirms that the linear energy storage law is also applicable to rock materials under uniaxial cyclic loading and unloading compression conditions. Moreover, the uniaxial compression energy storage coefficient calculated by the SEC method is highly close to that obtained based on the single cycle loading and unloading test, which indicates that the uniaxial compression energy storage coefficient of rock can also be calculated by multiple cyclic loading and unloading test. In conclusion, the linear energy storage law is a basic physical property of rock materials, and the uniaxial compression energy storage coefficient is a physical index reflecting the energy storage capacity of rock materials.

Experimental Study on Mechanical Properties, Acoustic Emission Energies and Failure Modes of Pre-cracked Rock Materials under Uniaxial Compression

2019 ◽  
Vol 176 (10) ◽  
pp. 4519-4532 ◽  
Author(s):  
Shujian Li ◽  
Dongming Zhang ◽  
Xin Bai ◽  
Xianmeng Zhang ◽  
Yapei Chu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Acoustic Emission ◽  
Uniaxial Compression ◽  
Failure Modes ◽  
Rock Materials

Numerical calibration of a yield limit function for rock materials by means of the Brazilian test and the uniaxial compression test

2015 ◽  
Vol 74 ◽  
pp. 24-29 ◽  
Author(s):  
Markus J. Mikl-Resch ◽  
Thomas Antretter ◽  
Martin Gimpel ◽  
Hubert Kargl ◽  
Gerhard Pittino ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Compression Test ◽  
Brazilian Test ◽  
Uniaxial Compression Test ◽  
Limit Function ◽  
Yield Limit ◽  
Rock Materials

scholarly journals The Influence of the Salt Mist on the Deterioration of Rock Materials

2014 ◽  
Vol 36 (1) ◽  
pp. 37-45 ◽  
Author(s):  
Agnieszka Katarzyna Kłopotowska ◽  
Paweł Łukaszewski
Keyword(s):  
Uniaxial Compression ◽  
High Resistance ◽  
Salt Spray ◽  
Rock Material ◽  
Geomechanical Properties ◽  
Progressive Deterioration ◽  
Rock Materials ◽  
Variable Susceptibility

Abstract The paper is focused on changes of geomechanical properties with regard to loss of long-term resistance in studies on the influence of salt spray on the structure of selected rocks from Poland. The investigation has shown that the analyzed rock material shows variable susceptibility to this corrosive factor. The most susceptible to ageing by salt mist were Śmiłów sandstones, whose progressive deterioration was observed in subsequent cycles. Analysis of resistance parameters has shown decreased resistance to uniaxial compression exceeding 30% also in the case of the Józefów limestones. Limestones from Raciszyn have revealed high resistance to ageing by salt mist.

scholarly journals Experimental Investigations on Electrical Charge of Precracked Rock Specimens under Uniaxial Compression

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Feng He ◽  
Zhenwei Wang ◽  
Yangfeng Zhao ◽  
Gaofeng Song ◽  
Bowen Liu
Keyword(s):  
Uniaxial Compression ◽  
Analytical Model ◽  
Electrical Charge ◽  
Experimental Investigations ◽  
Charge Accumulation ◽  
Engineering Structures ◽  
Rock Samples ◽  
Rock Materials ◽  
Friction Factors ◽  
Secondary Cracks

The electrical charge characteristic of rock materials under compression is an important index for predicting the development of rock fractures and the failure of engineering structures. However, the charge behaviours of a preexisting rock sample have not been studied in depth. In this study, sandstone samples with a single fabricated precrack at different angles of inclination are prepared. The uniaxial compression tests are performed to study the charge behaviours associated with the initiation and propagation of secondary cracks, the mechanical properties, and the progressive failure of stressed rock samples. An improved analytical model based on the maximum tensile stress failure theory for brittle materials is also proposed for determining the crack growth paths of the single precrack rock samples under uniaxial compression. The friction factors of crack surfaces are computed. The results show that the step functions on the curves of charge accumulation over time correspond to the fluctuation of stress, indicating the initiation of microcracks. The sample with a crack inclination angle of π / 4 shows the largest amount of both the first charge and the total accumulation. The analytical model shows a positive relationship between the crack face friction factors and the charge accumulation. The analytical solution of the crack development angles shows good agreement with the experimental results. This work may provide reference for the similar studies regarding the correlation of charging behaviours to the compressed rock materials.

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