Time-dependent subsidence prediction model and influence factor analysis for underground gas storages in bedded salt formations

Zhang, Guimin; Yu, Wu; Wang, Limin; Zhang, Kai; Daemen, J.J.K.; Liu, Wei

doi:10.1016/j.enggeo.2015.01.003

Cited by 49 publications

(36 citation statements)

References 29 publications

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“…Numerical modelling with reference to the salt deposits was applied mainly to design, monitoring and stability prediction of salt caverns used as underground storages or radioactive waste repositories [4]- [6]. However, the stability models for caverns or rooms in the bedded salt formations were also analysed [7], [8].…”

Section: Introductionmentioning

confidence: 99%

“…The 3D model of chambers characterized by a very complicated geometry and geological structure (Crystal Caves in Wieliczka Salt Mine) was built as well as numerical simulations were carried out with the use of the FLAC 3D v 5.0 software. FLAC modelling techniques are useful in prediction and monitoring of caverns and rooms stability in salt mines because the programme can simulate the behaviour of materials that exhibit creep [7], [8].…”

Section: Introductionmentioning

confidence: 99%

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Stability analysis of underground mining openings with complex geometry

Cała

Stopkowicz

Kowalski

et al. 2016

Studia Geotechnica Et Mechanica

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Stability of mining openings requires consideration of a number of factors, such as: geological structure, the geometry of the underground mining workings, mechanical properties of the rock mass, changes in stress caused by the influence of neighbouring workings. Long-term prediction and estimation of workings state can be analysed with the use of numerical methods. Application of 3D numerical modelling in stability estimation of workings with complex geometry was described with the example of Crystal Caves in Wieliczka Salt Mine. Preservation of the Crystal Caves reserve is particularly important in view of their unique character and the protection of adjacent galleries which are a part of tourist attraction included in UNESCO list. A detailed 3D model of Crystal Caves and neighbouring workings was built. Application of FLAC3D modelling techniques enabled indication of the areas which are in danger of stability loss. Moreover, the area in which protective actions should be taken as well as recommendations concerning the convergence monitoring were proposed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability analysis of underground mining openings with complex geometry

Cała

Stopkowicz

Kowalski

et al. 2016

Studia Geotechnica Et Mechanica

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“…In Egypt, about half of the yearly precipitation falls from December to March according to the World Bank Climate Change Knowledge Portal [54]. Precipitation is generally very low throughout the country, although along the Mediterranean coastline it averages more than 200 mm/year [55].…”

Section: Study Areamentioning

confidence: 99%

Impacts of Triple Factors on Flash Flood Vulnerability in Egypt: Urban Growth, Extreme Climate, and Mismanagement

et al. 2020

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Urban growth, extreme climate, and mismanagement are crucial controlling factors that affect flood vulnerability at wadi catchments. Therefore, this study attempts to understand the impacts of these three factors on the flash flood vulnerability in different climatic regions in Egypt. An integrated approach is presented to evaluate the urban growth from 1984 to 2019 by using Google Images and SENTINEL-2 data, and to develop hazard maps by using a rainfall-runoff-inundation model (RRI). Annual rainfall trend analysis was performed to evaluate the temporal variability trend. The hazard maps that were created were classified into three categories (low, medium, and high) and integrated with the urban growth maps to evaluate the impacts on the flood-vulnerable areas. The results show a significant increase in urban growth resulting in an increase of prone areas for flood hazards over time. However, the degree of this hazard is mainly related to growth directions. Mismanagement affects urban growth directions in both planned and unplanned growth, whether by loss of control over unplanned growth or by deficiencies in approved plans. The rainfall analysis showed that there is no explicit relationship to increases or decreases in the flood vulnerable areas. An urban planning approach is recommended for risk reduction management based on a comprehensive study considering such factors.

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“…3D finite difference program (FLAC3D, Itasca Consulting Group) was used to project the mechanical behaviour of salt and nonsalt rocks in order to evaluate stability conditions of the mine. FLAC modelling techniques are useful in prediction and monitoring of caverns and rooms stability in salt mines because the programme can simulate the behaviour of materials that exhibit creep (Zhang et al, 2015;Swift & Reddish, 2005;Cała et al, 2016).…”

Section: Deformation Analysismentioning

confidence: 99%

Long Term Analysis of Deformations in Salt Mines: Kłodawa Salt Mine Case Study, Central Poland

Cała¹,

Tajduś²,

Andrusikiewicz³

et al. 2017

Archives of Mining Sciences

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Located in central Poland, the Kłodawa salt dome is 26 km long and about 2 km wide. Exploitation of the dome started in 1956, currently rock salt extraction is carried out in 7 mining fields and the 12 mining levels at the depth from 322 to 625 meters below sea level (m.b.s.l.). It is planned to maintain the mining activity till 2052 and extend rock salt extraction to deeper levels. The dome is characterised by complex geological structure resulted from halokinetic and tectonic processes.Projection of the 3D numerical analysis took into account the following factors: mine working distribution within the Kłodawa mine (about 1000 rooms, 350 km of galleries), complex geological structure of the salt dome, complicated structure and geometry of mine workings and distinction in rocks mechanical properties e.g. rock salt and anhydrite. Analysis of past mine workings deformation and prediction of future rock mass behaviour was divided into four stages: building of the 3D model (state of mine workings in year 2014), model extension of the future mine workings planned for extraction in years 2015-2052, the 3D model calibration and stability analysis of all mine workings. The 3D numerical model of Kłodawa salt mine included extracted and planned mine workings in 7 mining fields and 14 mining levels (about 2000 mine workings). The dimensions of the model were 4200 m × 4700 m × 1200 m what was simulated by 33 million elements. The 3D model was calibrated on the grounds of convergence measurements and laboratory tests. Stability assessment of mine workings was based on analysis of the strength/stress ratio and vertical stress. The strength/stress ratio analysis enabled to indicate endangered area in mine workings and can be defined as the factor of safety. Mine workings in state close to collapse are indicated by the strength/stress ratio equals 1. Analysis of the vertical stress in mine workings produced the estimation of current state of stress in comparison to initial (pre-mining) conditions.The long-term deformation analysis of the Kłodawa salt mine for year 2014 revealed that stability conditions were fulfilled. Local disturbances indicated in the numerical analysis were connected with high chambers included in the mining field no 1 and complex geological structure in the vicinity of mine workings located in the mining fields no 2 and 3. Moreover, numerical simulations that projected the future extraction progress (till year 2052) showed positive performance. Local weakness zones in the mining Wyniki przeprowadzonej analizy numerycznej wykazały, że warunek stateczności wyrobisk Kopalni Soli Kłodawa jest spełniony dla stanu na rok 2014. Lokalnie występujące strefy wytężenia związane są z wysokimi komorami w polu eksploatacyjnym nr 1 oraz złożoną budową geologiczną w otoczeniu wyrobisk zlokalizowanych w polach eksploatacyjnych nr 2 i 3. Prognoza dla projektowanego stanu wyrobisk w roku 2052 (zakończenie eksploatacji) wykazała pozytywne rezultaty. Lokalne strefy osłabienia, które zidentyfikowano w polu eksploatacyjnym nr 7...

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Time-dependent subsidence prediction model and influence factor analysis for underground gas storages in bedded salt formations

Cited by 49 publications

References 29 publications

Stability analysis of underground mining openings with complex geometry

Stability analysis of underground mining openings with complex geometry

Impacts of Triple Factors on Flash Flood Vulnerability in Egypt: Urban Growth, Extreme Climate, and Mismanagement

Long Term Analysis of Deformations in Salt Mines: Kłodawa Salt Mine Case Study, Central Poland

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