Hydro-mechanical behavior of an argillaceous limestone considered as a potential host formation for radioactive waste disposal

Nguyen, Thanh Son; Li, Zhenze; Su, Grant; Nasseri, M. H. B.; Young, R. P.

doi:10.1016/j.jrmge.2018.03.010

Cited by 20 publications

(5 citation statements)

References 47 publications

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“…Before any kind of sound enters the computer, it is just an external voice signal, that is, an analog signal. Therefore, to process and analyze the sound, it is necessary to first convert the analog signal into a digital signal [9]. In this paper, some voice signals of broadcast hosts are recorded through microphone and computer sound card, and the useful and digitized voice data files are directly obtained for subsequent use.…”

Section: Signal Digitizationmentioning

confidence: 99%

Voice Timbre Evaluation of Broadcast Host Based on Extraction of Voice Feature Parameters

2022

IJAID

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The continuous development of science and technology has continuously improved people's quality of life. People's definition of health is also clearer, and more attention is paid to laryngeal diseases and the quality of voice. In real life, accurate evaluation of voice quality and timbre is not only beneficial to the diagnosis and treatment of laryngeal diseases. At the same time, it also plays a vital role in the selection and training of broadcasting and hosting talents. The current evaluation methods for related professional voices have shortcomings such as time-consuming, labor-intensive and highly subjective. In order to overcome these defects and explore how to help the training of broadcast hosts, this paper conducts in-depth research on the processing method of speech signals and the objective evaluation method of artistic voice timbre from the perspective of signal processing. Through experimental analysis, it is found that the objective evaluation method of voice timbre based on acoustic parameters F0, F1, F3 can better realize the objective evaluation of the voice timbre of the broadcast host. Among them, the accuracy rate of the evaluation method based on multiple feature parameter extraction reaches 89.2%.

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Section: Signal Digitizationmentioning

confidence: 99%

Voice Timbre Evaluation of Broadcast Host Based on Extraction of Voice Feature Parameters

2022

IJAID

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“…To quantitatively determine the range and variation pattern of EDZs, scholars have conducted studies based on various instruments to record relevant data, such as displacement and strain measurement [19,25], wave velocity testing [24,26], fluid permeation testing [21,27,28], gas permeation testing [5,29], resistivity testing [12,30,31], acoustic emission and microseismic event monitoring [32][33][34], borehole core analysis [13,35], chemical test methods [36,37], seismic wave testing [38][39][40][41], borehole camera technology [42,43], drill hole panoramic digital imaging technology [24], filling resin observation [17,44], and physical model tests [33]. It has been shown that the characteristics of EDZs vary with the rock properties, in situ stress field, geological environment, excavation method, and cavity section geometry, and the results obtained from different research methods vary.…”

Section: Introductionmentioning

confidence: 99%

The criterion for dividing the surrounding rock EDZs of underground caverns based on the energy dissipation degree

Wang

Zhang

et al. 2023

PLoS ONE

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An energy calculation parameter named the energy dissipation degree (RUd) is introduced based on the analysis of the energy dissipation mechanism and energy evolution characteristics during conventional triaxial tests of the granite of Shuangjiangkou. The deviatoric stress‒strain curve of rock can be divided into five stages using four stress thresholds (crack closure stress σcc, crack initiation stress σci, damage stress σcd and peak stress σp), which also correspond to the four RUd thresholds (RUdc, RUdi, RUdd and RUdp) on the energy dissipation degree–strain curve. A given stress threshold increases with increasing confining pressure; however, a given RUd threshold is basically stable under different confining pressures. Then, a new criterion for dividing the excavation damaged zones (EDZs) in the rock surrounding underground caverns based on the monotonically increasing characteristics of the energy dissipation degree‒axial strain relationship curve is proposed, and it allows for the classification of the surrounding rock into five types of zones through quantitative analysis of the RUd thresholds. Based on the criterion for dividing the EDZs of the surrounding rock mass of the underground cavern, the EDZs of the surrounding rocks of the underground cavern group of the Shuangjiangkou Hydropower Station are analyzed. The distribution characteristics of the EDZs of the rock surrounding underground caverns obtained by numerical simulation calculations based on RUd are basically the same as those obtained by in situ elastic wave tests. However, the RUd-based method for classifying the EDZs of the surrounding rock has the obvious advantage of being able to probe the boundaries of the undamaged zone (UDZ) of the surrounding rock more explicitly, while the method based on wave velocity testing is not sufficiently explicit. The damage zoning of the surrounding rock based on RUd can provide support design advice for the excavation of the surrounding rock, such as the support method, the length of the free section and anchor section of the prestressing anchor, etc.

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“…The Middle Ordovician Cobourg limestone, also known as the "Lindsay" limestone, is proposed as a potential host rock for deep disposal of low-and intermediate-level radioactive waste in Canada. Several investigations have been carried out so far to evaluate its mechanical properties [8][9][10][11], as well as petrological and mineralogical characteristics [12][13][14]. Since the main transport mechanism of radionuclides is via groundwater, isolation of radionuclides depends on the groundwater flow rate or interstitial velocity, which is determined by the porosity, hydraulic conductivity (or permeability), and hydraulic gradient.…”

Section: Introductionmentioning

confidence: 99%

An Integrated Imaging Study of the Pore Structure of the Cobourg Limestone—A Potential Nuclear Waste Host Rock in Canada

Klaver

et al. 2021

Minerals

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With the development of imaging technology, tools to quantitatively describe pore structure, morphology, and connectivity have been widely applied on low permeable rocks; however, it is still questionable to what extent this information can be used to predict permeability. Applicability and comparability of different techniques are discussed here for the Middle Ordovician Cobourg limestone (Canada), a rock dominated by calcite grains of variable sizes (µm–cm) and heterogeneously distributed quartz, dolomite, pyrite, and meshy clay minerals. Absolute porosities determined by helium pycnometry (HP) in literature are approximately 1.6% (±0.9%), and gas permeabilities range from 10−20 to 10−19 m2. Porosities obtained from BIB-SEM are much smaller compared to those from HP (16–69% of HP). Pores found in clays are smaller, slit-shaped, and more densely spaced when compared to those in calcite minerals. Connectivity between pores could not be resolved with 3D micro-CT or FIB-SEM reconstructions, which have a resolution limit of 8 µm and 10 nm, respectively. However, assuming the pores to be connected, laboratory-derived permeability data could be fitted using a simple capillary bundle model, including information about the visible pore size distributions obtained from BIB-SEM images and a tortuosity range of 8 to 15.

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Hydro-mechanical behavior of an argillaceous limestone considered as a potential host formation for radioactive waste disposal

Cited by 20 publications

References 47 publications

Voice Timbre Evaluation of Broadcast Host Based on Extraction of Voice Feature Parameters

Voice Timbre Evaluation of Broadcast Host Based on Extraction of Voice Feature Parameters

The criterion for dividing the surrounding rock EDZs of underground caverns based on the energy dissipation degree

An Integrated Imaging Study of the Pore Structure of the Cobourg Limestone—A Potential Nuclear Waste Host Rock in Canada

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