Novel adaptation of Marston's stress solution for inclined backfilled stopes
In underground mining, it is crucial to consider the arching phenomenon, especially for inclined backfilled trenches and mine stopes. That phenomenon decreases the vertical stress of the fill material, so, the in-site stress has already redistributed itself to the hanging- and foot-walls when the st...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Alexandria Engineering Journal |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110016822000709 |
| _version_ | 1818324454373064704 |
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| author | Walid El Kamash Hany El Naggar Sivakugan Nagaratnam |
| author_facet | Walid El Kamash Hany El Naggar Sivakugan Nagaratnam |
| author_sort | Walid El Kamash |
| collection | DOAJ |
| description | In underground mining, it is crucial to consider the arching phenomenon, especially for inclined backfilled trenches and mine stopes. That phenomenon decreases the vertical stress of the fill material, so, the in-site stress has already redistributed itself to the hanging- and foot-walls when the stope was excavated. In such cases, the mobilized resistance due to friction between the granular backfill material and the inclined walls can substantially reduce the pressure at the bottom of the stope, which could have a major impact on the stability of the backfill medium and consequently also on economic aspects. Most of researchers used numerical analysis or Lab. tests to predict both of vertical and lateral stresses in inclined stopes. However, there is a need to investigate analytical solution to describe the behaviour of those stresses in inclined stopes. Based on Marston’s formula, this research provides a new approach to predicting vertical stresses at any depth in inclined backfilled stopes. The proposed approach introduces a new parameter, η, to account for the contribution of backfill arching. This parameter specifies the ratio of normal stresses on the hanging wall and foot wall of the inclined backfilled stope. This differs from previous approaches, which assumed that the normal stress on the inclined backfilled stope's hanging wall and foot wall was equal. To validate the proposed approach, results obtained are compared with numerical, analytical, and experimental results from previous research. It is found that if the proposed parameter, η, is modified to 0.2 for the lateral earth pressure coefficient at rest with an angle of inclination of 60° to 80°, good agreement with experimental data is achieved. |
| first_indexed | 2024-12-13T11:28:51Z |
| format | Article |
| id | doaj.art-255f1c9f8ea84be3b5ce07665ce42750 |
| institution | Directory Open Access Journal |
| issn | 1110-0168 |
| language | English |
| last_indexed | 2024-12-13T11:28:51Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Alexandria Engineering Journal |
| spelling | doaj.art-255f1c9f8ea84be3b5ce07665ce427502022-12-21T23:48:03ZengElsevierAlexandria Engineering Journal1110-01682022-10-01611082218239Novel adaptation of Marston's stress solution for inclined backfilled stopesWalid El Kamash0Hany El Naggar1Sivakugan Nagaratnam2Department of civil engineering, suez canal university, Ismailia 41522, Egypt; Corresponding author.Department of Civil and Resource Engineering, Dalhousie University, Nova Scotia B3H 4R2, CanadaCollege of Science & Engineering, James Cook University, Townsville, AustraliaIn underground mining, it is crucial to consider the arching phenomenon, especially for inclined backfilled trenches and mine stopes. That phenomenon decreases the vertical stress of the fill material, so, the in-site stress has already redistributed itself to the hanging- and foot-walls when the stope was excavated. In such cases, the mobilized resistance due to friction between the granular backfill material and the inclined walls can substantially reduce the pressure at the bottom of the stope, which could have a major impact on the stability of the backfill medium and consequently also on economic aspects. Most of researchers used numerical analysis or Lab. tests to predict both of vertical and lateral stresses in inclined stopes. However, there is a need to investigate analytical solution to describe the behaviour of those stresses in inclined stopes. Based on Marston’s formula, this research provides a new approach to predicting vertical stresses at any depth in inclined backfilled stopes. The proposed approach introduces a new parameter, η, to account for the contribution of backfill arching. This parameter specifies the ratio of normal stresses on the hanging wall and foot wall of the inclined backfilled stope. This differs from previous approaches, which assumed that the normal stress on the inclined backfilled stope's hanging wall and foot wall was equal. To validate the proposed approach, results obtained are compared with numerical, analytical, and experimental results from previous research. It is found that if the proposed parameter, η, is modified to 0.2 for the lateral earth pressure coefficient at rest with an angle of inclination of 60° to 80°, good agreement with experimental data is achieved.http://www.sciencedirect.com/science/article/pii/S1110016822000709Mine stopesBackfillsStress distributionMarston’s formula |
| spellingShingle | Walid El Kamash Hany El Naggar Sivakugan Nagaratnam Novel adaptation of Marston's stress solution for inclined backfilled stopes Alexandria Engineering Journal Mine stopes Backfills Stress distribution Marston’s formula |
| title | Novel adaptation of Marston's stress solution for inclined backfilled stopes |
| title_full | Novel adaptation of Marston's stress solution for inclined backfilled stopes |
| title_fullStr | Novel adaptation of Marston's stress solution for inclined backfilled stopes |
| title_full_unstemmed | Novel adaptation of Marston's stress solution for inclined backfilled stopes |
| title_short | Novel adaptation of Marston's stress solution for inclined backfilled stopes |
| title_sort | novel adaptation of marston s stress solution for inclined backfilled stopes |
| topic | Mine stopes Backfills Stress distribution Marston’s formula |
| url | http://www.sciencedirect.com/science/article/pii/S1110016822000709 |
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