Measurements of Acoustic Emission and Deformation in a Repository of Nuclear Waste in Salt Rock

Hesser, Jürgen; Kaiser, Diethelm; Schmitz, H.; Spies, Thomas

doi:10.1007/978-3-319-09060-3_99

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…Due to a severe risk associated with roof falls, several studies are being carried out to assess the possibility of this type of phenomenon. The scope of these tests includes seismic measurements that allow determining the change of seismic wave propagation parameters depending on the degree of deformation of the rock mass [5], microseismic monitoring [6,7], acoustic emission [8][9][10], measurements of roof layer delamination and displacement using strain gauges [11] and optical fiber [12] and monitoring of electromagnetic radiation [13]. In recent years, attempts have been made to use slope changes to monitor the stability of rock layers, both in underground [14,15] and opencast mining [16,17].…”

Section: Introductionmentioning

confidence: 99%

Practical Use of Measuring the Deflection of Roof Layers in the Assessment of the Stability of Mining Excavations in the Polish Copper Ore Mine “Polkowice-Sieroszowice”

Stolecki

Szczerbiński

2021

Mining

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The paper presents the results of long-term continuous measurements of the deflection of the roof layers in the underground copper mine Polkowice-Sieroszowice, Poland belonging to KGHM Polska Miedź S.A. The measurements were performed with the use of the inclinometric method consisting of continuous registration of changes in the angle of inclination of the roof strata. The measurements were carried out using an inclinometer sensor fixed to the end of a rockbolt in the roof. Measurements presented in the article were made in various regions of the underground mine. The monitoring covered: The exploitation front, machinery chamber and the region of the experimental longwall mining of copper ore. The obtained results proved the usefulness of the developed method in the process of the evaluation of the stability of mining excavations. The sensors were highly sensitive and performed the measurements in a simple way; highly accurate and reliable results were obtained.

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Section: Introductionmentioning

confidence: 99%

Practical Use of Measuring the Deflection of Roof Layers in the Assessment of the Stability of Mining Excavations in the Polish Copper Ore Mine “Polkowice-Sieroszowice”

Stolecki

Szczerbiński

2021

Mining

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“…Due to its excellent self-healing ability, low permeability and good long-term creep behavior, salt rock has been recognized as an ideal medium for underground energy storage and nuclear waste disposal [1][2][3]. While the main composition of pure salt rock is sodium chloride, the composition of impure salt rock is more complicated.…”

Section: Introductionmentioning

confidence: 99%

Impurity Effects on the Mechanical Properties and Permeability Characteristics of Salt Rock

et al. 2020

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Impure salt rock strata are extensively distributed in China, giving them great significance in the study of the physical properties of impure salt rock for the construction of underground gas storage in salt mines. To investigate the confining pressure and impurity effects on the mechanical properties and gas permeability characteristics of salt rock, permeability tests under hydrostatic confining pressure and conventional triaxial compression (CTC), on salt rock samples with different impurity contents, were carried out. The results demonstrate that the confining pressure effects cause an increase in triaxial compression strength, but a decrease in permeability. However, impurity enhances the bearing capacity and permeability of the salt rock; both rock strength and permeability increase with an increase in impurity content. Moreover, the broken salt rock specimens were analyzed after the CTC test using Computed Tomography (CT) equipment. To understand the relationships between pore volume and permeability, considering the confining pressure and impurity effects, the cracks were divided into four groups according to different crack diameter ranges: ~0.05 mm, 0.05–1 mm, 1–10 mm and ~10 mm. The CT analysis results show that while the pore volume of smaller cracks shows an “increasing–decreasing” trend by increasing confining pressure, the pore volume of large cracks gradually decreases, indicating that the rock permeability is highly related to macro-cracks. However, impurity has more complicated implications on rock permeability and cracks, and needs further investigation.

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“…Zhao et al 15 established constitutive models for use in numerical codes for rock response prediction near underground excavations. Hesser et al 16 considered that the formation of micro-and macrocracks led to volume expansion and that the AE area was consistent with a large deformation zone. Stanchits et al 17 conducted a series of tests to study the influence of fluid viscosity on hydraulic fracture and obtained large differences when fracturing with water and high-viscosity fluids.…”

Section: Introductionmentioning

confidence: 99%

Damage and fractal evolution trends of sandstones under constant-amplitude and tiered cyclic loading and unloading based on acoustic emission

Liang

Zhang

Xie

et al. 2019

International Journal of Distributed Sensor Networks

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It is of significance to study the damage and destruction of rock under cyclic loading in geotechnical engineering. We determined the trends in damage evolution of sandstone under constant-amplitude and tiered cyclic loading and unloading under uniaxial compression. The results of the study show that (1) the variation of acoustic-emission events was consistent with the stress curves and 89% of all acoustic-emission events occurred during the cycling stages. The observed Kaiser effect was more notable in tiered cycling. (2) The damage variable increased sharply in the cycling stages and its increment was 0.07 higher for tiered cycling than constant-amplitude cycling. Sandstone exhibited greater damage under tiered cyclic loading and unloading. (3) Equations for the evolution of the damage variable under the two cycle modes were obtained by fitting of experimental data. (4) The fractal dimensions of the constant-amplitude cycle were larger than those of the tiered cycle. The process of damage and destruction presents a trend of reducing fractal dimension. The damage accumulation of sandstone under tiered cycling was faster than under constant-amplitude cycling. These results provide references for damage and early warning of rock under both constant-amplitude and tiered cyclic loading and unloading.

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Measurements of Acoustic Emission and Deformation in a Repository of Nuclear Waste in Salt Rock

Cited by 7 publications

References 2 publications

Practical Use of Measuring the Deflection of Roof Layers in the Assessment of the Stability of Mining Excavations in the Polish Copper Ore Mine “Polkowice-Sieroszowice”

Practical Use of Measuring the Deflection of Roof Layers in the Assessment of the Stability of Mining Excavations in the Polish Copper Ore Mine “Polkowice-Sieroszowice”

Impurity Effects on the Mechanical Properties and Permeability Characteristics of Salt Rock

Damage and fractal evolution trends of sandstones under constant-amplitude and tiered cyclic loading and unloading based on acoustic emission

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