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| http://dx.doi.org/10.1007/s11695-019-04033-w | DOI Listing |
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Research on the acoustic emission characteristics and instability correlation effect of the dynamic response of waste dump slopes.
Sci Rep
January 2025
Yunnan Phosphating Group Co., Ltd, Kunming, 650600, China.
Due to the fluidity of the loose medium inside the waste dump slope, the traditional monitoring system cannot fully reflect the misalignment and slip between particles inside the medium, and it is also difficult to capture the precursor information of the slip of the loose accumulation body. To reveal the dynamic evolution process of the slope instability of the waste dump slope, the coupling test system of the slope instability of the waste dump slope was used to carry out the study of the acoustic emission characteristics of the slope instability dynamic response of the dump slope under the action of vibration, and to quantitatively analyse the staged characteristics of the acoustic emission parameter evolution of the dump slope under the action of different vibration frequencies and its instability initiation node. The results show that with the increase of vibration frequency, the damage mode of the slope model gradually changes from sliding of small particles to large-scale landslides, and presents the stage process of "vibration compaction → vibration equilibrium → dynamic instability"; Under the action of low-frequency and high-amplitude, the slope model mainly shows that the tiny particles and the basement gravel slip, which is difficult to capture with the naked eye, while under the action of high-frequency and low-amplitude, the slope surface is damaged in a large area, and the overall model is unstable; The dynamic instability of the waste dump slope is accompanied by obvious acoustic emission activities, and the changes of the characteristic parameters of acoustic emission reveal, to a certain extent, the evolution of the internal state of the slope in the process of dynamic instability of the waste dump slope and its stage characteristics; The amplitude and energy efficiency of acoustic emission in the time domain show obvious fractal characteristics in the dynamic instability of the waste dump slope.
View Article and Find Full Text PDFInfluence of heat pipe layout parameters on the cooling effect of spontaneous combustion coal gangue dumps.
Sci Rep
November 2024
College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China.
Article Synopsis
- Existing research indicates that factors such as the number, angle, and depth of heat pipes (HPs) significantly influence temperature distribution in coal gangue dumps, but optimal HP arrangement remains underexplored.
- This study analyzes the impact of HP layout on temperature fields within coal gangue dumps through numerical simulations and experiments, leading to the identification of an optimal layout that enhances heat dissipation.
- Findings reveal that decreasing HP insertion spacing and increasing insertion depth results in a reduction of both the spontaneous combustion danger zone and maximum temperature, with optimal cooling effects achieved at 3m spacing and 7m depth.
Long-term coastal dynamics: The evolution of a mixed sediment mega-nourishment consisting of colliery spoil.
J Environ Manage
December 2024
School of Engineering, Newcastle University, Newcastle Upon Tyne, UK.
Mega-nourishments, where large volumes of sediment are deposited on coastlines, are increasingly employed to manage shoreline erosion, yet our understanding of their long-term behaviour is limited by the fact that most current schemes are less than 15 years old. However, on the County Durham coast, 39 million m of coal spoil was tipped onto beaches between the late 1800s and 1993, acting as a de facto mixed sediment mega-nourishment. Our findings reveal key insights into the long-term dynamics of mega-nourishment schemes, including evidence of effective sediment dispersal around headlands into normally disconnected units of coast.
View Article and Find Full Text PDFStructural dynamics of human deoxyuridine 5'-triphosphate nucleotidohydrolase (dUTPase).
Sci Rep
October 2024
Department of Chemistry, UiT the Arctic University of Norway, PO Box 6050, Stakkevollan, 9037, Langnes, Tromsø, Norway.
Structural- and functional heterogeneity, as well as allosteric regulation, in homo-monomeric enzymes is a highly active area of research. One such enzyme is human nuclear-associated deoxyuridine 5'-triphosphate nucleotidohydrolase (dUTPase), which has emerged as an interesting drug target in combination therapy with traditional nucleotide analogue treatment of cancer. We report, for the first time, a full structural dynamics study of human dUTPase by NMR.
View Article and Find Full Text PDFRecovery of compaction resources in internal dump of gently inclined composite coal seam open-pit mine.
Sci Rep
October 2024
Inner Mongolia Coal Mine Design and Research Institute Co., Ltd., Hohhot, 010000, China.
In the production and construction process of a slowly inclined composite coal seam surface mine in China, the problem of coal compression by the non-working slope is common, but the research on coal recovery is usually conducted for the end slope compression problem. Due to the small economic and reasonable stripping ratio in the early stage of infrastructure construction in an open-pit mine, the buried deep coal seam has not yet been mined and is covered by internal dumping. In recent years, with the gradual increase of the economic and reasonable stripping ratio, the mining of coal seam covered by internal dumping site has become feasible.
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