Article
Geosciences, Multidisciplinary
Maria Del Pilar Di Martino, Luca De Siena, Nicola Tisato
Summary: By simulating the propagation of shear waves in computational models representing volcanic rocks, this study investigates the impact of pore space parameters on wave amplitudes and phases. The results show that the size, shape, volume, and location of pores affect waveform characteristics, particularly after multiple scattering.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Vladimir Lyakhovsky, Eyal Shalev, Ittai Kurzon, Wenlu Zhu, Laurent Montesi, Nikolai M. Shapiro
Summary: This study proposes a new mechanism explaining the significant reduction in mechanical properties and enhanced attenuation in areas of partially molten rocks. The mechanism involves solid-melt phase transition at thermodynamic equilibrium, where any pressure change causes solidification or melting and modifies the heat balance, leading to energy dissipation and seismic wave attenuation. The predicted values are approximately consistent with large scale seismological observations, indicating that seismic waves are mostly attenuated in Earth's crust and mantle due to the presence of melt.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Xiaojing Zhang, Wenjin Yao, Xiaoming Wang, Wei Zhu, Zhenyu Lu, Xintao Zhu, Hongxin Huang
Summary: This study investigated the penetration resistance and damage characteristics of red sandstone and limestone at different projectile speeds. Results show that limestone has a stronger penetration resistance but weaker energy absorption effect compared to red sandstone, leading to easier formation of large cracks. Red sandstone exhibited softer compaction area with more particle detachment, and was more sensitive to the impact angle of the projectile.
APPLIED SCIENCES-BASEL
(2022)
Article
Geochemistry & Geophysics
Hui Qi, Jing Ba, Tobias M. Mueller
Summary: This study developed a double-porosity model to describe the rock velocity-temperature and velocity-porosity relations, highlighting the effects of temperature and fluid properties on these relations. The model also predicts that the velocity dispersion and the attenuation peak of P-waves in carbonate rock samples become less pronounced with increasing temperature.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Physics, Applied
Andrea P. Arguelles
Summary: This paper explores the suitability of using von Karman spatial correlation functions to describe polycrystalline media with different grain size distributions. The results show that the von Karman function is more accurate and tractable than other commonly reported SCFs. The impact of SCF on wave propagation and scattering is studied, with significant attenuation variations observed in the case of aluminum material.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Geochemistry & Geophysics
Junxin Guo, Boris Gurevich, Xiaofei Chen
Summary: In this study, we analyze the dynamic SV-wave signatures of fluid-saturated porous rocks containing intersecting fractures. We found that the dispersion and attenuation of SV-waves have similar dependence on properties of intersecting fractures and fluid as those of P-waves, but the influence of FB-WIFF is smaller for SV-waves. In addition, WIFF and elastic scattering greatly affect the anisotropy properties of both SV- and P- waves, which are sensitive to fracture intersection angles and differ between the two types of waves. The complementary features of SV- and P- waves provide a basis for fracture intersection detection.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Yanbin He, J. German Rubino, Santiago G. Solazzi, Nicolas D. Barbosa, Marco Favino, Tianning Chen, Jinghuai Gao, Klaus Holliger
Summary: We propose a novel coupled fluid-poroelastic model and numerical upscaling procedure to calculate seismic attenuation and velocity dispersion in porous rocks induced by fluid pressure diffusion in the presence of mesoscopic fluid-saturated voids. The proposed approach shows advantages over purely poroelastic models in modeling fluid-saturated mesoscopic voids, and allows for the effects of different types of fluid pressure diffusion in the seismic characteristics of synthetic samples.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Engineering, Geological
Hailiang Jia, Shun Ding, Fan Zi, Guoyu Li, Yuan Yao
Summary: In cold regions, repeated frost action can increase the anisotropy of sedimentary rocks, potentially raising rock engineering risks. Experimental results show that key parameters of sandstone decrease with increasing freeze-thaw cycles, indicating the impact on its anisotropy, with significant differences in initial values and decay rates between different sample sets.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Zhaoyun Zong, Yu Chen
Summary: The study introduces a new cylindrical patchy-saturation model to describe seismic wave propagation in partially gas-saturated rocks, addressing the issues of high-frequency oscillation and low-frequency attenuation.
Article
Materials Science, Multidisciplinary
Shaojie Chen, Jianxi Ren, Xiang Ren, Yugen Li
Summary: This study investigates the deterioration laws of concrete durability under the coupling action of salt erosion and drying-wetting cycles. The experimental results show that the mass loss rate of concrete, as well as the relative dynamic modulus of elasticity and compressive strength, decrease first and then increase with the action of salt erosion and drying-wetting cycles. The porosity and pore quantity fluctuation also increase. The damage degree of concrete induced by drying-wetting cycles is arranged as MgSO4 > Na2SO4 > NaCl.
FRONTIERS IN MATERIALS
(2022)
Article
Engineering, Geological
Saif Alzabeebee, Diyari Abdalrahman Mohammed, Younis Mustafa Alshkane
Summary: The research aims to develop prediction models for the unconfined compressive strength (UCS) of limestone rocks, addressing the expensive and time-consuming nature of laboratory testing. By collecting 104 samples and conducting one-dimensional regression analysis and EPR-MOGA analysis, it was found that the latter showed better prediction performance. The proposed models can replace existing regression equations and provide assistance when a compression testing machine is unavailable or suitable samples are hard to obtain. Additionally, the models can serve as independent quality control checks.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Shengqing Li, Wenhao Wang, Yuanda Su, Junxin Guo
Summary: Fractures significantly affect the elastic properties of rocks. This study derives a theoretical model based on the previous TI background and arbitrary dip crack model, using the Bond transform matrix, to quantify the effects of any oriented penny-shaped cracks on the elastic properties of rocks. The study finds that crack orientation has a great influence on rock elastic properties, especially when cracks are inclined with respect to the TI background isotropic plane. Furthermore, multiple crack sets have significant effects on S-wave anisotropy.Using this model, a complete workflow for fracture properties inversion using field data measured by acoustic logging is introduced. The results indicate that considering both crack dip and azimuth angles in the inversion process provides good agreement with resistivity imaging results. This work provides a theoretical basis for fracture properties inversion for rocks with a TI background.
Article
Environmental Sciences
Nurcihan Ceryan, Erkan Caner Ozkat, Nuray Korkmaz Can, Sener Ceryan
Summary: Several soft computing models, including SVR, GPR, and ANN, were developed to predict the elastic modulus of magmatic rocks with different degrees of weathering. The GPR model performed the best according to PIRMSE and PIMAE values. Various performance indicators were used to assess and compare the performance of the developed models, indicating the importance of using multiple evaluation metrics for comprehensive analysis.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Energy & Fuels
Chunfang Wu, Jing Ba, Xiaoqin Zhong, Jose M. Carcione, Lin Zhang, Chuantong Ruan
Summary: The study combines the White patchy-saturation theory and the squirt flow model to propose a new theory for wave anelasticity induced by fluid flow in partially saturated reservoir rocks. Experimental data shows good agreement with theoretical results, demonstrating the efficacy of the new theory in describing wave propagation characteristics in tight sandstone reservoir rocks.
Article
Energy & Fuels
Zhao Zhang, Zhongxian Cai
Summary: This study utilized a digital image analysis framework to reveal the variation trend of permeability with pore structure parameters in carbonate rocks and established a binary permeability-porosity model. Different discrete rock types showed unique permeability-porosity relationships.