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Experimental Study on Mechanical Properties of Sandstone Under Sinusoidal Dynamic Load
https://orcid.org/0000-0003-0409-3657
Abstract To investigate the dynamic characteristics of rock, uniaxial sinusoidal stress cyclic loading was applied to a cylindrical sandstone and unloading tests were carried out under different cyclic amplitude, cyclic frequency, and cyclic mean value using a dynamic loading test device, which has been independently developed by Chongqing University. The mechanical properties of sandstone were quantitatively analyzed by considering the elastic modulus and Poisson’s ratio. From the viewpoint of energy, the stress–strain diagram of a single cyclic load was divided into different zones, the energy dissipation rate of a complete cycle was defined, and the energy conversion of rock during cyclic loading and unloading was investigated. The following conclusions were drawn. First, the elastic modulus increases with the cyclic amplitude, cyclic mean value, and cyclic frequency of the cyclic loading. This indicates that ultra-high loading and excessively fast frequency cyclic loading will cause the compaction of fine cracks, which leads to the deformation capacity of the rock being significantly diminished. Secondly, under cyclic loading, there is a cut-off point for the cyclic amplitude, cyclic frequency, and cyclic mean value, which results in the obvious fluctuation of Poisson’s ratio. This point can be considered as the critical point of rock instability. Finally, in the case of different cyclic amplitude, cyclic frequency, and cyclic mean value, the total work of loading changes only slightly with the number of cycles, and the energy dissipation rate is positively correlated with the cyclic amplitude, cyclic mean value, and cyclic frequency.
Experimental Study on Mechanical Properties of Sandstone Under Sinusoidal Dynamic Load
https://orcid.org/0000-0003-0409-3657
Abstract To investigate the dynamic characteristics of rock, uniaxial sinusoidal stress cyclic loading was applied to a cylindrical sandstone and unloading tests were carried out under different cyclic amplitude, cyclic frequency, and cyclic mean value using a dynamic loading test device, which has been independently developed by Chongqing University. The mechanical properties of sandstone were quantitatively analyzed by considering the elastic modulus and Poisson’s ratio. From the viewpoint of energy, the stress–strain diagram of a single cyclic load was divided into different zones, the energy dissipation rate of a complete cycle was defined, and the energy conversion of rock during cyclic loading and unloading was investigated. The following conclusions were drawn. First, the elastic modulus increases with the cyclic amplitude, cyclic mean value, and cyclic frequency of the cyclic loading. This indicates that ultra-high loading and excessively fast frequency cyclic loading will cause the compaction of fine cracks, which leads to the deformation capacity of the rock being significantly diminished. Secondly, under cyclic loading, there is a cut-off point for the cyclic amplitude, cyclic frequency, and cyclic mean value, which results in the obvious fluctuation of Poisson’s ratio. This point can be considered as the critical point of rock instability. Finally, in the case of different cyclic amplitude, cyclic frequency, and cyclic mean value, the total work of loading changes only slightly with the number of cycles, and the energy dissipation rate is positively correlated with the cyclic amplitude, cyclic mean value, and cyclic frequency.
Experimental Study on Mechanical Properties of Sandstone Under Sinusoidal Dynamic Load
https://orcid.org/0000-0003-0409-3657
Abstract To investigate the dynamic characteristics of rock, uniaxial sinusoidal stress cyclic loading was applied to a cylindrical sandstone and unloading tests were carried out under different cyclic amplitude, cyclic frequency, and cyclic mean value using a dynamic loading test device, which has been independently developed by Chongqing University. The mechanical properties of sandstone were quantitatively analyzed by considering the elastic modulus and Poisson’s ratio. From the viewpoint of energy, the stress–strain diagram of a single cyclic load was divided into different zones, the energy dissipation rate of a complete cycle was defined, and the energy conversion of rock during cyclic loading and unloading was investigated. The following conclusions were drawn. First, the elastic modulus increases with the cyclic amplitude, cyclic mean value, and cyclic frequency of the cyclic loading. This indicates that ultra-high loading and excessively fast frequency cyclic loading will cause the compaction of fine cracks, which leads to the deformation capacity of the rock being significantly diminished. Secondly, under cyclic loading, there is a cut-off point for the cyclic amplitude, cyclic frequency, and cyclic mean value, which results in the obvious fluctuation of Poisson’s ratio. This point can be considered as the critical point of rock instability. Finally, in the case of different cyclic amplitude, cyclic frequency, and cyclic mean value, the total work of loading changes only slightly with the number of cycles, and the energy dissipation rate is positively correlated with the cyclic amplitude, cyclic mean value, and cyclic frequency.
Experimental Study on Mechanical Properties of Sandstone Under Sinusoidal Dynamic Load
Fu, Boxue (author) / Zhang, Dongming (author) / Ye, Chen (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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