Theoretical explanation of conditions for sinkholes after emergency flooding of potash mines

Baryakh, A. A.; Devyatkov, S. Yu.; Samodelkina, N. A.

doi:10.1134/s1062739116010101

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…MATEC Web of Conferences 265, 05026 (2019) https://doi.org/10.1051/matecconf/201926505026 GCCETS 2018 are in good agreement with the information on the location and configuration of existing salt mines [11,12]. a b Fig.…”

supporting

confidence: 68%

“…For example, in [10] it is noted that for coal mines this ratio is 0.7 and, for salt deposits, it is in the range from 1.65 to 1.85 [11]. For salt deposits, exploited at depths 300 400m  H = , according to estimates [12,13], the distance L is 500÷600m. The presented estimates of the characteristic sizes and shapes of the deformed part of the earth's surface allow us to conclude that it is possible to estimate such distortions of the surface, using the information obtained from the objects of a smaller scale located on it.…”

Section: Fig 1 the Scheme Of Changes Of The Earth's Surface Overlyimentioning

confidence: 99%

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Control of surface subsidence based on building deformation monitoring data

et al. 2019

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This paper presents an approach to the estimation of ground surface distortion based on the data from the online deformation monitoring systems mounted on the foundations of the group of buildings located in the area of ground instability. The local monitoring systems provide control of building foundation settlements using the hydrostatic level measurement technique. These data are used to calculate the inclination foundation angles which reflect the distortion of the earth's surface at local points. The hydrostatic level system allows one to perform measurements with the desired space and time sampling and to obtain a quite detailed picture of the changes in the deformation parameters over time. A set of such local monitoring units forms a distributed system that allows monitoring the state of the earth's surface over a large area. Here, we present long-term results obtained using such system located in the city area above mining. The evolution of the inclination angles of the group of overlying buildings is shown. We discuss the validity of this approach, and estimate the accuracy of the measuring method and the factors that influence it. Finally, we assess the possibility of making short-term predictions of deformation processes inside the rock massif.

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supporting

confidence: 68%

Section: Fig 1 the Scheme Of Changes Of The Earth's Surface Overlyimentioning

confidence: 99%

Control of surface subsidence based on building deformation monitoring data

et al. 2019

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“…𝑑𝑀 𝑔 𝑑𝑡 = − 𝑀 𝑔 𝑉 0 − 𝑞𝑡 √ 𝑃 0 (𝑀 𝑎 + 𝑀 𝑔 ) 𝜌 0 𝑉 − 𝑃 0 𝑅 + 𝛾(ℎ(𝑡))𝜌 𝑔 (10) with initial conditions 𝑀 𝑎 (0) = 𝑀 0 , 𝑀 𝑔 (0) = 0 kg. Here 𝜌 0 = 𝑀 0 𝑉 0 ⁄ = 1.25 kg/m 3 is the initial air density in the worked-out space.…”

Section: Methodsmentioning

confidence: 99%

Modeling and Mitigating Gas Hazards during Potash Mine Closure

Kolesov,

Semin,

Starikov

et al. 2024

Preprint

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The planned closure of potash mines, achieved through the injection of highly mineralized brines into the worked-out area, is a complex and not fully studied process. A critical concern arises when brines obstruct the aerodynamic connections between the flooded mine's airspace and the atmosphere, potentially leading to the formation of closed cavities where explosive gases can accumulate. To address this hazard, it is imperative to develop systems capable of extracting the gas-air mixture from the unflooded domed portions of the worked-out area. This is the focus of this study, in which we analyze gas-dynamic processes within the potassium mine worked-out area during planned flooding. Two distinct scenarios are examined: the first involves controlled flooding with saturated brines, while the second contemplates flooding resulting from a hypothetical breakthrough of supra-salt strata, leading to the ingress of groundwater into the worked-out area. A novel mathematical model is introduced to predict the evolution of gas-air mixture parameters in the unflooded dome segment of the worked-out area. Utilizing this model, we assess the effectiveness of proposed measures designed to eliminate explosive gases from the worked-out area. Specifically, a pipeline system is proposed for the removal of gases, followed by their dilution below the maximum permissible concentrations in the effluent jet. The findings from this study contribute valuable insights into ensuring the safe and efficient closure of potash mines, shedding light on potential risks and effective mitigation strategies for gas-related hazards during planned flooding.

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