Effect of wet-dry cycling on the pore characteristics of red sandstone after heat treatment

Bulletin of Engineering Geology and the Environment, Год журнала: 2023, Номер 83(1)

Опубликована: Дек. 22, 2023

Язык: Английский

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Experimental study of the influence of saturation on the resistivity response of sandstone

Frontiers in Earth Science, Год журнала: 2024, Номер 12

Опубликована: Янв. 16, 2024

Studying the changes in electrical resistivity of sandstones under various frequencies and saturation levels is important for addressing many geological problems through prospecting. In this study, we investigated effect different (500 Hz–200 kHz) (0%–100%) on sandstone Ordos region. Our research indicates that when level low (<40%), decreases rapidly. With increase level, pore water gradually becomes another major factor affecting addition to induced polarization effect. When high (>80%), tends stabilize. Additionally, with saturation. Furthermore, an frequency, rate reduction slows down, influence This study provides a valuable reference practical application

Язык: Английский

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Fractal discrete fracture network modeling of radon gas concentration in underground tunnels under Książ Castle in Poland

Bulletin of Engineering Geology and the Environment, Год журнала: 2024, Номер 83(7)

Опубликована: Июнь 12, 2024

Abstract The numerical modeling of radon concentrations in the fault zone underground excavations at Książ Castle was conducted using a stochastic Discrete Fracture Network (DFN) model. Due to difficulties related with obtaining exact fractures rock mass, novel approach used this study incorporates model known site data. analysis utilized dataset comprising long-term measurements 222 Rn activity concentration and geodetic for twelve faults unit. parameters considered DFN are: fracture length, Peclet number ( Pe = 0.1 1.0, respectively), advection velocities (from 10 –8 m/s –6 from range –7 –4 m/s, diffusion D 2.1 × 1/s), decay constant λ gas generation q ) along within 1.5 –3 Bq/m 3 ·s 3.5 ·s. calibration process obtained best fit when rate uniformly distributed through mass addition incorporating higher value 3.0 ·s) where elevated have been measured. results also confirmed that should always be were measured regardless measurement period. For indicated “area” 25% 37.5% between May–October 18.5% 40% November–April. influence zones on recorded noticeable up depth 15 m. Within range, highest values concentration, ranging 1,600 2,000 , consistently observed season. However, as increased, decreased 800 400 became more dispersed.

Язык: Английский

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Study on the effect of soil type and pore structure on radon release from soils in coal mine areas

Bulletin of Engineering Geology and the Environment, Год журнала: 2024, Номер 83(11)

Опубликована: Окт. 14, 2024

Язык: Английский

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