Nath, Som and Tripathi, Adarsh and Singh, Ashok Kr and Verma, Harsh Kr and Rai , Nachiketa (2025) Blast damage induced degradation in rock mass parameters of Himalayan jointed rock slopes: A parametric study. Journal of Earth System Science, 134. ISSN 0253-4126

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Abstract

Slopes along Himalayan roadways are susceptible to different forms of failure due to the jointed and fragile nature of Himalayan rock masses. Excavation of rock mass is a prominent process in the construction of new highways and the widening of the existing ones. The excavation activity invariably requires the drilling and blasting method due to its economical nature and flexibility to get the desired excavation rock profile. However, blast-induced damage to the remaining rock mass is inevitable because of unscientific and poor blasting practices. The intrinsic rock mass parameters such as compressive strength, friction angle, cohesion, and deformation modulus are reduced to varying degrees along these excavation-induced damage zones. The extent of the blast-induced damage zone (BIDZ) along an excavated slope profile is the function of rock mass properties and blasting parameters. A factor ‘D’, introduced in the Generalized Hoek–Brown (GHB) failure criterion, is a qualitative parameter that considers disturbance and stress relaxation in rock masses due to blasting. Its value varies between 0 and 1, with 1 representing the highest level of disturbance. Quantifying the impact of D on rock mass parameter assessment is crucial for economical and reliable design in rock engineering projects, which has been addressed in the present work using the GHB failure criterion. Additionally, the effect of blast damage on rock mass failure envelopes, in terms of principal stresses and Mohr failure envelope, has also been discussed. The findings from this study will provide insights into the degradation of rock mass parameters under different slope mass conditions influenced by varying degrees of blast damage. This will enhance our understanding of instability mechanisms in jointed rock masses, providing a more accurate method for stability analysis of excavated rock slopes.

Item Type:	Article
Subjects:	Blasting
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	18 Sep 2025 10:49
Last Modified:	18 Sep 2025 10:49
URI:	http://cimfr.csircentral.net/id/eprint/2903

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