Forty years spatio-temporal seismicity distribution and the evidences of the pore pressure impact on triggering earthquakes at the northern part of Lake Nasser, Aswan, Egypt

Hassib, Gaber H.; Saadalla, Hamada; Mohamed, Haggag H.

doi:10.1016/j.jafrearsci.2023.105019

Journal of African Earth Sciences

2023

DOI: 10.1016/j.jafrearsci.2023.105019

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Forty years spatio-temporal seismicity distribution and the evidences of the pore pressure impact on triggering earthquakes at the northern part of Lake Nasser, Aswan, Egypt

Gaber H. Hassib

Hamada Saadalla

Haggag H. Mohamed

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2024

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Study on the influence of pore water pressure on shear mechanical properties and fracture surface morphology of sandstone

Cheng,

Liu,

et al. 2024

Sci Rep

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To further investigate the weakening effect of pore water pressure on intact rock mechanics properties and characteristics of fracture surface after failure, direct shear tests of sandstone were conducted under different pore pressure. A 3D scanner was employed to digitize the morphology of the post-shear fracture surface. The variogram function was applied to quantify the anisotropic characteristics of post-shear fracture surface. The relationship between deformation during shear failure of intact rock and quantitative parameters of fracture surface after shear failure was initially established. It can be found that amplitudes of the sinusoidal surface determine the maximum value of variogram, and period affect lag distance that reach the maximum value of variogram. Test results revealed that the increase of pore pressure has obvious weakening effect on shear strength and deformation of rock. Moreover, the increase of pore pressure makes the shear fracture surface flatter. It can be obtained that both Sillmax and Rangemax are positively related to shear strain, but negatively related to normal strain.

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Study on the influence of pore water pressure on shear mechanical properties and fracture surface morphology of sandstone

Cheng,

Liu,

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

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Forty years spatio-temporal seismicity distribution and the evidences of the pore pressure impact on triggering earthquakes at the northern part of Lake Nasser, Aswan, Egypt

Cited by 1 publication

References 22 publications

Study on the influence of pore water pressure on shear mechanical properties and fracture surface morphology of sandstone

Study on the influence of pore water pressure on shear mechanical properties and fracture surface morphology of sandstone

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