Experimental Investigation of Wave Velocity-Permeability Model for Granite Subjected to Different Temperature Processing

Abstract

Understanding the change of permeability of rocks before and after heating is of great significance for exploitation of hydrocarbon resources and disposal of nuclear waste. The rock permeability under high temperature cannot be measured with most of the existing methods. In this paper, quality, wave velocity, and permeability of granite specimen from Maluanshan tunnel are measured after high temperature processing. Quality and wave velocity of granite decrease and permeability of granite increases with increasing temperature. Using porosity as the medium, a new wave velocity-permeability model is established with modified wave velocityporosity formula and Kozeny-Carman formula. Under some given wave velocities and corresponding permeabilities through experiment, the permeabilities at different temperatures and wave velocities can be obtained. By comparing the experimental and the theoretical results, the proposed formulas are verified. In addition, a sensitivity analysis is performed to examine the effect of particle size, wave velocities in rock matrix, and pore fluid on permeability: permeability increases with increasing particle size, wave velocities in rock matrix, and pore fluid; the higher the rock wave velocity, the lower the effect of wave velocities in rock matrix and pore fluid on permeability.

Investigation on Pore Structure and Permeability of Concrete–Rock Interfacial Transition Zones Based on Fractal Theory

“…Skalny [15,16] first proposed to investigate the permeability characteristics of the ITZ by comparing the permeability test results of pure rock, cement-based and cement slurry-rock. Subsequently, many scholars have obtained the permeability of the ITZ by this method and proved that the permeability of the ITZ is far greater than mortar [17,18]. However, some scholars have assumed that although the permeability of the ITZ is large, it is not necessarily the permeability channel of the whole structure [15,16].…”

Experimental and Numerical Studies on Permeability Properties of Thermal Damaged Red Sandstone under Different Confining Pressures

“…Meanwhile, confining pressure also affects the permeability properties of the rocks. In addition, the relationship between the permeability and the porosity of rock has also been studied [22,[26][27][28][29][30]. Chaki et al [22] studied the porosity and permeability evolutions of thermal damage granite, and results showed that the permeability measurement can better characterize the porosity and connected porosity of the specimen.…”

“…Chaki et al [22] studied the porosity and permeability evolutions of thermal damage granite, and results showed that the permeability measurement can better characterize the porosity and connected porosity of the specimen. Jiang et al [26] established a new wave velocity-permeability model for granite subjected to different temperatures according to the modified wave velocity-porosity formula and Kozeny-Carman formula. Jia et al [27] and Zheng et al [28] studied the effective stressdependent permeability and porosity of low-permeability rock, and results showed that a power-law form can be used to describe the correlation of permeability and porosity.…”

Experimental Investigation on the Correlation between Dynamic Ultrasonic and Mechanical Properties of Sandstone Subjected to Uniaxial Compression

“…Hence, ultrasonic wave velocity measurements can be used to determine the anisotropy and the microcrack evolution of rocks during loading [18][19][20][21]. Furthermore, the permeability and the porosity of rocks also can be determined based on the connection between mesostructures of rock and ultrasonic wave velocity [22][23][24]. However, all the predictions by using the wave velocity measurements are statistical equations and have a certain error.…”