Abstract
Construction of tunnels, slopes, deep basements, foundations and retaining walls are common in shale. Quality of shale can be assessed based on the Q index system. This paper presents the analysis of charts developed for Q index of shale from three different parameters such as block size (RQD/Jn), inter-block shear strength (Jr/Ja) and active stress (Jw/SRF). For the range of values chosen for RQD/Jn, Jr/Ja and Jw/SRF a Q index was estimated and charts were established between Q index and RQD/Jn for various values of Jr/Ja and Jw/SRF. The charts presented in the paper for Q index can be used to classify the shale. Shale should have minimum Jr/Ja, Jw/SRF and RQD/Jn as 0.5, 0.2 and 10 respectively to be classified as good to very good category.
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Kumar, N.D., Singh, R.R., Ali, F., Efray’im (2017). Development of Classification Charts for Q Index of Shale from the Parameters. In: Ferrari, A., Laloui, L. (eds) Advances in Laboratory Testing and Modelling of Soils and Shales (ATMSS). ATMSS 2017. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-319-52773-4_32
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DOI: https://doi.org/10.1007/978-3-319-52773-4_32
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