Estimation of mobilised cohesion around underground openings

Based on the field data obtained from 12 Indian and several NGI case histories, a semi-empirical relation has been proposed in this paper for determination of “mobilised” cohesion around underground openings. It has been found that mobilisation of cohesion takes place at higher values around undergr...

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Bibliographic Details
Published inInternational journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 34; no. 5; pp. 851 - 858
Main Authors Verman, M., Singh, B., Jethwa, J.L., Viladkar, M.N.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 1997
Elsevier Science
Subjects
Applied sciences
Buildings. Public works
Exact sciences and technology
Geotechnics
Soil mechanics. Rocks mechanics
Tunnels, galleries
Shear test
Cohesion
Rock mechanics
Anisotropy
Underground construction
Rock mass
Computing method
Strength
Tunnels
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Summary:Based on the field data obtained from 12 Indian and several NGI case histories, a semi-empirical relation has been proposed in this paper for determination of “mobilised” cohesion around underground openings. It has been found that mobilisation of cohesion takes place at higher values around underground openings than the valves previously suggested and the values obtained from block shear tests. A strength enhancement factor has been suggested which is to be multiplied with the cohesion parameter obtained from block shear tests for practical application. This apparent strength enhancement may be attributed to anisotropy in strength, statistical variation in strength and confining conditions around tunnels.
ISSN:1365-1609
1873-4545
DOI:10.1016/S1365-1609(96)00061-7