A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Numerical Modelling for Prediction of Ground Subsidence Over Room and Pillar Mining in an Underground Coal Seam
https://orcid.org/http://orcid.org/0000-0002-0569-1053
https://orcid.org/http://orcid.org/0000-0003-0291-8379
https://orcid.org/http://orcid.org/0000-0001-7882-6038
https://orcid.org/http://orcid.org/0000-0003-0564-6209
The main objective of this study is to predict the surface subsidence due to the extraction of coal seam from an underground mine. The mining method is room and pillar and complete pillar recovery through depillaring and simultaneous stowing with sand. The coal seam roof level is located at a depth of 121 m below ground level. The overburden consists of different layers of sandstones and shales with the top 4 m of silty sand. Square-shaped pillars of the size of 23 × 23 m are made during the panel’s development. Three-dimensional finite element software, Plaxis 3D, was considered for numerical modelling to simulate the complete movement over the panel, and a linear elastic material model was considered for overburden layers. A rectangular panel area (600 × 300 m) was selected in the model. Initially, the numerical analysis was carried out for the developed panel, and subsidence was estimated at the ground surface and coal seam roof level as 15.40 and 17.80 mm, respectively. To increase coal recovery from a panel, complete depillaring is done by the mining authorities and simultaneous stowing with filler materials to reduce the chances of seam roof collapse. Therefore, in the subsequent phases, complete removal of pillars was analysed as an underground cavity with simultaneous stowing with fill material (dense sand) in the cavity to support the overlying strata and minimize the subsidence effect at the ground surface. The surface subsidence was predicted during complete depillaring and stowing with sand 83.98 and 15.56 mm, respectively. This study showed that the surface subsidence in underground mining could be arrested if simultaneous stowing is carried out during the depillaring operation. Most importantly, this would save the surface infrastructures and properties from damages.
Numerical Modelling for Prediction of Ground Subsidence Over Room and Pillar Mining in an Underground Coal Seam
https://orcid.org/http://orcid.org/0000-0002-0569-1053
https://orcid.org/http://orcid.org/0000-0003-0291-8379
https://orcid.org/http://orcid.org/0000-0001-7882-6038
https://orcid.org/http://orcid.org/0000-0003-0564-6209
The main objective of this study is to predict the surface subsidence due to the extraction of coal seam from an underground mine. The mining method is room and pillar and complete pillar recovery through depillaring and simultaneous stowing with sand. The coal seam roof level is located at a depth of 121 m below ground level. The overburden consists of different layers of sandstones and shales with the top 4 m of silty sand. Square-shaped pillars of the size of 23 × 23 m are made during the panel’s development. Three-dimensional finite element software, Plaxis 3D, was considered for numerical modelling to simulate the complete movement over the panel, and a linear elastic material model was considered for overburden layers. A rectangular panel area (600 × 300 m) was selected in the model. Initially, the numerical analysis was carried out for the developed panel, and subsidence was estimated at the ground surface and coal seam roof level as 15.40 and 17.80 mm, respectively. To increase coal recovery from a panel, complete depillaring is done by the mining authorities and simultaneous stowing with filler materials to reduce the chances of seam roof collapse. Therefore, in the subsequent phases, complete removal of pillars was analysed as an underground cavity with simultaneous stowing with fill material (dense sand) in the cavity to support the overlying strata and minimize the subsidence effect at the ground surface. The surface subsidence was predicted during complete depillaring and stowing with sand 83.98 and 15.56 mm, respectively. This study showed that the surface subsidence in underground mining could be arrested if simultaneous stowing is carried out during the depillaring operation. Most importantly, this would save the surface infrastructures and properties from damages.
Numerical Modelling for Prediction of Ground Subsidence Over Room and Pillar Mining in an Underground Coal Seam
https://orcid.org/http://orcid.org/0000-0002-0569-1053
https://orcid.org/http://orcid.org/0000-0003-0291-8379
https://orcid.org/http://orcid.org/0000-0001-7882-6038
https://orcid.org/http://orcid.org/0000-0003-0564-6209
The main objective of this study is to predict the surface subsidence due to the extraction of coal seam from an underground mine. The mining method is room and pillar and complete pillar recovery through depillaring and simultaneous stowing with sand. The coal seam roof level is located at a depth of 121 m below ground level. The overburden consists of different layers of sandstones and shales with the top 4 m of silty sand. Square-shaped pillars of the size of 23 × 23 m are made during the panel’s development. Three-dimensional finite element software, Plaxis 3D, was considered for numerical modelling to simulate the complete movement over the panel, and a linear elastic material model was considered for overburden layers. A rectangular panel area (600 × 300 m) was selected in the model. Initially, the numerical analysis was carried out for the developed panel, and subsidence was estimated at the ground surface and coal seam roof level as 15.40 and 17.80 mm, respectively. To increase coal recovery from a panel, complete depillaring is done by the mining authorities and simultaneous stowing with filler materials to reduce the chances of seam roof collapse. Therefore, in the subsequent phases, complete removal of pillars was analysed as an underground cavity with simultaneous stowing with fill material (dense sand) in the cavity to support the overlying strata and minimize the subsidence effect at the ground surface. The surface subsidence was predicted during complete depillaring and stowing with sand 83.98 and 15.56 mm, respectively. This study showed that the surface subsidence in underground mining could be arrested if simultaneous stowing is carried out during the depillaring operation. Most importantly, this would save the surface infrastructures and properties from damages.
Numerical Modelling for Prediction of Ground Subsidence Over Room and Pillar Mining in an Underground Coal Seam
Lecture Notes in Civil Engineering
Muthukkumaran, Kasinathan (editor) / Ayothiraman, R. (editor) / Kolathayar, Sreevalsa (editor) / Shekhar, Nisheeth (author) / Pal, Supriya (author) / Jaiswal, Arpan (author) / Hazara, Pratip (author)
Indian Geotechnical Conference ; 2021 ; Trichy, India
Soil Dynamics, Earthquake and Computational Geotechnical Engineering ; Chapter: 15 ; 155-165
2023-01-01
11 pages
Article/Chapter (Book)
Electronic Resource
English
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