TUNNEL EVALUATION IN CROCKER FORMATION BY GEOLOGICAL STRENGTH INDEX (GSI) SYSTEM: A CASE STUDY Article Swipe
YOU?
·
· 2018
· Open Access
·
· DOI: https://doi.org/10.26480/gbr.02.2018.21.24
This study was conducted to determine the value of Geological Strength Index (GSI), to predict rock mass properties, \nvery unfavourable discontinuities combination and tunnel support pressure for rock bolts or shotcrete and to \ndetermine the suitability of GSI for a tunnel in Crocker Formation. Engineering geological mapping and discontinuity \nsurvey was done along the tunnel face as well as rock sampling. GSI values and the disturbance factor were obtained \nfrom field observation on the tunnel face. Point load and dry density test was conducted to determine the Uniaxial \nCompressive Strength (UCS) and unit weight, respectively. The rock mass properties, kinematic analysis and limit \nequilibrium analysis was used to determine the factor of safety (F.O.S) and pressure to stabilise the tunnel. The rock \nmass was characterised by 94.88 MPa UCS, 0.024 MN/m3 unit weight, widely space and high persistency. The GSI \nvalue is 50 with 0.8 disturbance factor. The cohesion, friction angle and tensile strength are 3.671 MPa, 25.20° and \n0.056 MPa respectively. The friction angle was reduced by 5° due to lower shear strength of bedding plane. There \nare eight possibilities of discontinuities combinations on tunnel crown that have F.O.S lower than 2 and \ncombination of joints 2, 4 and 6 has the maximum wedge volume of 28.37 m3. The maximum support pressure of \nrock bolts or shotcrete for F.O.S of 2 at the tunnel crown is 0.04 MN. The high F.O.S value may have been due to the \noverestimation of friction angle and cohesion of discontinuity plane. Then, this study shows that GSI system is \nunsuitable for the tunnel in study area which behave as anisotropic and structurally controls rock mass, but if \nneeded, the values of rock mass properties, discontinuities combination and support pressure can be used for tunnel \ndesign.
Related Topics
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.26480/gbr.02.2018.21.24
- https://doi.org/10.26480/gbr.02.2018.21.24
- OA Status
- diamond
- Cited By
- 1
- References
- 20
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W2894772972
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W2894772972Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.26480/gbr.02.2018.21.24Digital Object Identifier
- Title
-
TUNNEL EVALUATION IN CROCKER FORMATION BY GEOLOGICAL STRENGTH INDEX (GSI) SYSTEM: A CASE STUDYWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2018Year of publication
- Publication date
-
2018-08-01Full publication date if available
- Authors
-
Lee Kiun You, Ismail Abd RahimList of authors in order
- Landing page
-
https://doi.org/10.26480/gbr.02.2018.21.24Publisher landing page
- PDF URL
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https://doi.org/10.26480/gbr.02.2018.21.24Direct link to full text PDF
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YesWhether a free full text is available
- OA status
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diamondOpen access status per OpenAlex
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https://doi.org/10.26480/gbr.02.2018.21.24Direct OA link when available
- Concepts
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Index (typography), Geology, Geotechnical engineering, Forensic engineering, Engineering, Computer science, World Wide WebTop concepts (fields/topics) attached by OpenAlex
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1Total citation count in OpenAlex
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2018: 1Per-year citation counts (last 5 years)
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20Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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| abstract_inverted_index.GSI \nvalue | 132 |
| abstract_inverted_index.There \nare | 168 |
| abstract_inverted_index.and \n0.056 | 150 |
| abstract_inverted_index.discontinuities | 19, 172, 266 |
| abstract_inverted_index.rock \nmass | 115 |
| abstract_inverted_index.if \nneeded, | 259 |
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| abstract_inverted_index.is \nunsuitable | 242 |
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| abstract_inverted_index.tunnel \ndesign. | 275 |
| abstract_inverted_index.and \ncombination | 183 |
| abstract_inverted_index.properties, \nvery | 17 |
| abstract_inverted_index.limit \nequilibrium | 97 |
| abstract_inverted_index.the \noverestimation | 226 |
| abstract_inverted_index.Uniaxial \nCompressive | 83 |
| abstract_inverted_index.discontinuity \nsurvey | 46 |
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| cited_by_percentile_year.min | 90 |
| countries_distinct_count | 0 |
| institutions_distinct_count | 2 |
| sustainable_development_goals[0].id | https://metadata.un.org/sdg/13 |
| sustainable_development_goals[0].score | 0.5799999833106995 |
| sustainable_development_goals[0].display_name | Climate action |
| citation_normalized_percentile.value | 0.61391827 |
| citation_normalized_percentile.is_in_top_1_percent | False |
| citation_normalized_percentile.is_in_top_10_percent | False |