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Studying the energy dissipation characteristics of high-temperature rock after cooling with water during geothermal drilling construction is crucial to improving rock crushing efficiency. The energy dissipation characteristics of granite were investigated by conducting dynamic tests with a split Hopkinson pressure bar (SHPB) system under …
and Xu 2015), Westerly granite (Heard 1980), California granite (Richard et al. 1970; Gunsallus and Kulhawy 1984) and climax granite (Heard 1980)). Most of the tests did not combine high temperature and high pressure in real-time. After years of thorough geological investigation and research, we found that many X-type fractures were pro-
permeability of granite under high confining pressure and water pressure. The results showed that the permeability of granite decreased with the increase of ef-
This paper aims to study the effect of cyclic heating and flowing-water cooling conditions on the physical properties of granite. Ultrasonic tests, gas measured porosity, permeability, and microscope observations were conducted on granite after thermal treatment. The results showed that the velocity of P- and S-waves decreased as …
Under the effect of water and various flow rates of acidic aqueous chemical solution, the mass of the sample was reduced inordinately. The mass damage level of granite was described by the mass loss factor Dt: Dt = (m0 −mt) /m0 × . (2) D t = ( m 0 − m t) / m 0 × 100 %. ( 2) In Eq. 2, m0 is the original mass of the sample and mt is the ...
Liquid nitrogen fracturing and hot dry rock geothermal development are both emerging technologies in the field of energy. However, during the extraction of geothermal energy, it can cause the evolution of geological fractures, leading to the diffusion of groundwater and pollutants, thereby causing environmental pollution issues. Currently, …
Section snippets Sample preparation. The material studied in this work is granite, which is extracted from the Hunan Province of China. The cuboid samples with the suggested size (50 × 50 × 100 mm) by the ISRM (International Society for Rock Mechanics), 24 were used in this work. The average value of density, thermal conductivity, and P …
The change in the mineral content of the granite after high temperature exposure was measured using X-ray diffraction and the effect on the mechanical properties was discussed. The microstructure of the granite after uniaxial compression was observed using scanning electron microscopy (SEM) and stereomicroscopy.
grees before and after the influence of mining method were studied by in-situ and indoor seepage tests and theoretical calculation, and the impact of min- ing method tunneling on granite ...
The evolution of permeability and microcrack characteristics of granite at high temperature has significant effect on the safe and stable operation of high-level nuclear waste disposal repositories. We measure the permeability, porosity and formation factors of granite specimens following thermal treatment including the use of NMR to certify …
News. Arsenic is a naturally occurring element, but long-term exposure can cause cancer in people. There has been a substantial amount of research done to address arsenic in groundwater and drinking-water supplies around the country. The USGS studies local and national sources of arsenic to help health officials better manage our water …
Moreover, the cooling mode on the granite also has a certain influence on the stimulation effect. After water-cooling on the heated granite (300 °C), combined with the CO 2 bearing fluid stimulation (240 …
Experimental results and analysis. Under the action of cooling shocks, the high-temperature granite was damaged to different extents. The temperature difference between the high-temperature rock and the cold medium at 150 °C is so small that there is almost no cracking on the rock surface, so the cooling shock effect on the granite at 150 …
Felton Pit Water level Mining has altered ground-water flow paths affecting the water supply to a calcareous fen. Table 1. Summary table of sites and impacts studied. Limestone Quarries Limestone quarries are found in southeastern Minnesota from the Twin Cities south to Iowa and west to Mankato. Some of these operations mine below the water table.
This finding confirms that cyclic thermal shock aggravated the thermal damage of the granite. Previous studies have found similar effects of temperature on the permeability of granite, as shown in Figure 6 [ 29, 49 ]. From 105°C to 450°C, the permeability of granite increases slowly.
This paper is aiming at studying the influence of cyclic heating and water cooling on physicomechanical properties of Beishan granite, which is chosen as a …
Abstract It's necessary to understand mechanical and thermal fracture characteristics of hot dry rock under cyclic thermal loading to exploit geothermal resources. In this paper, the P-wave velocity test, saturated water absorption test and tensile test were carried out for hollow cylindrical granite samples after cyclic thermal shock. The …
Mining is the extraction of minerals and other geological materials of economic value from deposits on the Earth. Mining adversely affects the environment by inducing loss of biodiversity, soil erosion, and …
Granite is the most common intrusive igneous rock. Due to its high strength it has been widely used in the construction industry and deep mining operations are often conducted in the vicinity of granitic rocks. Therefore, it is crucial to understand granite׳s mechanical behavior, in particular, under cyclic loading conditions.
The primary objective of this study is to examine the effects of liquid nitrogen fracturing on hot dry rocks, focusing specifically on granite specimens. The experimental design comprises two sets of granite samples to explore the impact of liquid nitrogen cooling cycles on the mode I fracture characteristics, acoustic emission features, and ...
The longitudinal wave velocity of alkaline granite at room temperature is 3.114 km/s. Fig. 5 shows the variation characteristics of P-wave velocity of granite after quenching and thermal fatigue treatment. Under different quenching cycles, the P-wave velocity of granite has similar temperature effect, which decreases with the increase of …
Gautam et al 18 have studied the temperature on the physical and mechanical properties of granite after natural cooling. Brotóns et al 7 and Rathnaweera et al 2 have considered the effect of rapid cooling with water. In this section, the changes in the physical and mechanical properties after natural cooling and water cooling are analyzed from ...
2.1 Materials and Specimen Preparation. As shown in Fig. 1 of the topography of Wuyue Storage Hydropower Station, our tested large-scale rock specimens were collected from the exploratory adit PD1, at the same level as a pair of tailrace tunnels to be excavated in the fault zone. The rock mass was completely weathered, easy to collapse, …
This phenomenon implies that the damage degree of granite increases and more micro-cracks are expected to form inside the granite because of the effects of high-temperature and acidic stimulation. Notably, the mechanical response behavior from 400 °C to 600 °C changes significantly, which is caused by structural water loss and phase ...
5%. 53%. Mining water use is water used for the extraction of minerals that may be in the form of solids, such as coal, iron, sand, and gravel; liquids, such as crude petroleum; and gases, such as natural gas. The category includes quarrying, milling of mined materials, injection of water for secondary oil recovery or for unconventional oil …
Analysis of P-wave Velocity Data. The P-wave velocity is one of the most important physical parameters characterizing the integrity of a rock. Table 1 and Figure 5 show the P-wave velocity data of dried and saturated granite before temperature treatment and after 5, 10, 15 and 20 heating and cooling cycles. With increase in the number of …
There are two main characteristics of thermal damage of HDR: (1) quenching effect of high temperature rock mass in cold water (also known as thermal shock); (2) …
Furthermore, after undergoing multiple high-temperature heating and liquid nitrogen cooling cycles, numerous microcracks or damage occur within the granite. The …
