Analysis of liquefaction risk of sterile material in the inner dump of North Pesteana quarry in the conditions of flooding of the remaining gap

Apostu, Izabela-Maria; Lazăr, Maria; Faur, Florin

doi:10.1051/matecconf/202030500005

Cited by 5 publications

(7 citation statements)

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“…The creation of favorable conditions in these areas with the flooding of the remaining gap (loose and saturated sandy rocks and the manifestation of water pressure in the pores) can favor the occurrence of the liquefaction phenomenon. According to studies, it was estimated an average risk of liquefaction [22]. So far, in the South and North Peșteana perimeters, no liquefaction phenomena have been recorded.…”

Section: Figure 7 Stability Analysis For the System Of Steps I-ii Of The Inner Dump (North Peșteana Perimeter; Natural Drainage Conditionmentioning

confidence: 99%

“…According to the studies performed, in the area of Peşteana perimeter there were no notable earthquakes (with epicenter in the studied area or within the current limits of Romania) that would cause significant effects, so statistically, it is unlikely that earthquakes in the country will have major negative effects in this region [18], [19], [22]- [25]. Consequently, the seismic influences in the thixotropy process are insignificant.…”

Section: The Seismic Factormentioning

confidence: 99%

“…Even if these significant vibrations, generated by the circulation of heavy machinery, act only during the period of activity of the mining operation, and at the end of the mining activity their action is reduced, the negative effect accumulated during the active period cannot be eliminated. The effect of vibrations is felt through changes in the strength characteristics of rocks (in the sense of their worsening) [22].…”

Section: The Seismic Factormentioning

confidence: 99%

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Factors influencing the flooding process of former coal open-pits

Lazăr¹,

Apostu²,

Faur³

et al. 2021

Min. miner. depos.

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Purpose. This study aims to identify the main factors that influence the flooding process of the remaining gaps of open-pits comprising essentially the velocity and duration of flooding, but also the stability of in situ and dump slopes during and after the flooding and the water quality in order to ensure the takeover of the future function of the land as soon as possible and the safety of objects and local communities. Methods. Establishing the three categories of factors that influence from a quantitative and qualitative point of view the flooding of the remaining gaps of the open pits. Analysis of the key factors in the flooding process of the remaining gaps, in terms of their contribution to reducing or increasing the flood duration and to reducing or increasing the stability reserve of different types of slopes. Findings. The interdependence and cumulative action of factors that influence the flooding process of remaining gaps and the stability of in situ and dump slopes materializes in worsening the strength characteristics of rocks and changing the state of stress and deformations in the rock mass. Originality. The paper provides a detailed description of the key factors and the interactions between these and their in-fluence on the flooding process, stability, and the factor of safety. Their influence and interactions are highlighted through a case study conducted at the Peșteana mining perimeter level. Practical implications. The flooding of the remaining gaps can cause loss of slope stability during and after the flooding process. Unexpected geotechnical phenomena such as landslides, liquefaction, suffosis, rock falls and/or the water quality of the pit lake can be hazardous to natural and/or anthropic objects and local communities. Safety is essential. Therefore, this study suggests taking into account the most important factors that influence the flooding process when evaluating the floo-ding possibility of remaining gaps. Engineers, researchers, mine planers, local authorities, and students will have essential information and will know when and where special attention will be needed in the case of flooding of former open-pits.

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Section: Figure 7 Stability Analysis For the System Of Steps I-ii Of The Inner Dump (North Peșteana Perimeter; Natural Drainage Conditionmentioning

confidence: 99%

Section: The Seismic Factormentioning

confidence: 99%

Section: The Seismic Factormentioning

confidence: 99%

See 1 more Smart Citation

Factors influencing the flooding process of former coal open-pits

Lazăr¹,

Apostu²,

Faur³

et al. 2021

Min. miner. depos.

Self Cite

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“…The classification by hazard groups of the rock massifs/deposits according to the nature of the objects in the area of influence and the degree of stability, existing in the specialized literature, was completed with the natural objects and five categories of vulnerability of the objects were established depending on the technical state of the final slopes (Table 7) [18,[54][55][56].…”

Section: Failure Risk Assessments Of Final Slopesmentioning

confidence: 99%

“…Table 7. Classification of rock massifs/deposits according to the nature of the objects in the area and establishment of the vulnerability of the objects [18,[54][55][56].…”

Section: Failure Risk Assessments Of Final Slopesmentioning

confidence: 99%

A Suggested Methodology for Assessing the Failure Risk of the Final Slopes of Former Open-Pits in Case of Flooding

2021

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Some valuable minerals, such as lignite, are extracted through open-pit mining works. After the cessation of mining activity, large-scale gaps result in the landscape. These gaps, also called “remaining gaps”, represent some of the roughest types of environmental impacts. After the cessation of mining activity, recovery and ecological restoration works are required. However, it is first necessary to carry out risk assessment studies considering the possible future influences on the final slopes. For this study, flooding of the remaining lignite open-pits gaps was considered as the ecological restoration option. The study was based on extensive research, including sampling, laboratory tests, statistical-mathematical processing, hypothesis formulation, evaluations, interpretations, and field observations, regarding the rock behavior and occurrence of negative geotechnical phenomena (geotechnical phenomena that have a negative impact and a risk on the integrity of the environment and local communities, such as landslides, rockfalls, liquefaction, suffosis) during the flooding process. This paper’s originality consists of combining the methods and methodologies developed with the help of classic methods (Fellenius, Janbu, and Bishop methods) and probabilistic ones (Rosenblueth method) existing in the specialized literature for solving the proposed problem and structuring the information similar to a guide.

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A framework for assessing hazards related to pit lakes: application on European case studies

et al. 2023

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The number of abandoned mines is continuously increasing in the world. The sustainable exploitation of these abandoned mines is a top priority globally. Pit lakes created in abandoned mining sites provide benefits and present risks for the mining region. This paper presents a methodology to assess the mining and natural hazards related to pit lakes. The proposed methodology framework is based on well-established and internationally accepted risk management standards and allows the assessment of the long-term stability of pit lakes. Potential ground movements, water pollution, fire hazards are presented, and their impact evaluated based on feedback and international experience. The methodology was applied for 13 European pit lakes created in former European coal and lignite mines. A risk assessment of the Most lake was carried out, using qualitative and a weighted probabilistic approach that considers the overall and the individual effect of identified mining and natural hazards. Results showed that the main potential hazards are the ground movements, slope stability, and flooding.

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Analysis of liquefaction risk of sterile material in the inner dump of North Pesteana quarry in the conditions of flooding of the remaining gap

Cited by 5 publications

References 4 publications

Factors influencing the flooding process of former coal open-pits

Factors influencing the flooding process of former coal open-pits

A Suggested Methodology for Assessing the Failure Risk of the Final Slopes of Former Open-Pits in Case of Flooding

A framework for assessing hazards related to pit lakes: application on European case studies

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