Correlating Textural Parameters with Joint Roughness for Himalayan Schist and Gneissic rocks
IR@CIMFR: CSIR-Central Institute of Mining and Fuel Research, Dhanbad
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| Title |
Correlating Textural Parameters with Joint Roughness for Himalayan Schist and Gneissic rocks
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| Creator |
Nath, Som
Singh,, Ashok K. Kundu, Jagadish Verma,, H. K. Dwivedi, R. D. Rai, N. |
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| Subject |
Rock Testing
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| Description |
The shear strength characteristics of jointed rock masses are interrelated to the roughness of joint
surfaces. These joint surfaces are characterized by mineral grains and their textural arrangements
such as orientation, size, shape, degree of grain linking, and relative quantities of grains and matrix
in a rock which varies accordingly. Textural Coefficient (TC), a dimensionless quantitative
measure, is often used to quantify the intrinsic textural characteristics of rocks. The Joint roughness
coefficient (JRC) is a metric that is frequently used to characterize rock mass roughness in the field
that inherently controls the inter-block shear strength of jointed rock masses. This parameter has
significant importance in the indirect assessment of rock mass strength to be used in a variety of
rock engineering projects and has a direct association with the inherent textural parameters.
Therefore, in the present work, we have made observations on the Himalayan schist and gneissic
lithologies to quantify the potential control of textural characteristics (TC) on joint roughness
(JRC). The JRC for studied rock types were measured in field and then statistically derived from
the 2D surface profiles using the root means square of the first derivative of the profile outline (Z2).
The TC values for studied rock types were estimated using microphotographs of respective joint
surfaces. The statistical analyses suggest two groups of data correlation controlled by a threshold
TC value of 1.1. Both the groups showed a strong linear correlation between JRC and TC for the
studied lithologies signifying the control of textural characteristics on joint roughness. As a result
of the study, empirical equations have been proposed to quantify the JRC from Z2 as well as using
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| Publisher |
Indian Society for Rock Mechanics and Tunnelling Technology
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| Date |
2023
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| Type |
Article
PeerReviewed |
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| Identifier |
Nath, Som and Singh,, Ashok K. and Kundu, Jagadish and Verma,, H. K. and Dwivedi, R. D. and Rai, N. (2023) Correlating Textural Parameters with Joint Roughness for Himalayan Schist and Gneissic rocks. Journal of Rock Mechanics and Tunnelling Technology, 29 (1). pp. 49-66. ISSN 0253-4126
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| Relation |
http://cimfr.csircentral.net/2685/
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