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Coupled effect of joint orientation and blast-induced damage zone on the stability of jointed rock slopes

Author

Listed:
  • Som Nath

    (Indian Institute of Technology
    CSIR-Central Institute of Mining and Fuel Research)

  • Ashok Kr Singh

    (CSIR-Central Institute of Mining and Fuel Research)

  • Harsh Kr Verma

    (CSIR-Central Institute of Mining and Fuel Research)

  • Shubham Chaudhary

    (CSIR-Central Building Research Institute)

  • Nachiketa Rai

    (Indian Institute of Technology)

Abstract

The present study examines and discusses the coupled effect of Blast-Induced Damage Zones (BIDZ) and joint orientation on the stability of vulnerable road cut slopes along the strategic National Highway-5 in Himachal Pradesh, India by using the continuum numerical modelling approach. In this study, the field conditions of BIDZ in jointed rock slopes have been presented and its impact on failure behaviour has been analysed considering cases of daylight and anti-dip joint orientations. Subsequently, Low-Dip (LD) and High-Dip (HD) in the case of daylighted joints and Anti-Dip (AD) along with combinations of LD, HD and AD were considered to investigate the effect of BIDZ. Additionally, the Joint Persistence Factor was also taken into account to investigate the effect of the areal extent of joint due to blasting within BIDZ. The outcomes of this work highlight that anti-dip (AD) joints show low deformation and shear strain changes indicating increased stability even in the presence of blast disturbance whereas Low-Dip (LD) and High-Dip (HD) joints show a progressive decline in critical strength reduction factor from low-dip to high dip and at same time increase in total displacement and maximum shear strain. The patterns in failure behaviour are observed to be highly influenced by blast damage zones coupled with joint orientation and its persistence factor. The high joint persistence factor significantly affects the areal extent of rock mass deformation and failure patterns, particularly in LD joint conditions. These results provide important new information derived from investigations and modelling on blast damage zones in rock slopes, and they have significant consequences in the planning and maintenance of transportation infrastructure in hilly areas. It is crucial to use these findings while designing appropriate stabilization measures in order to ensure the stability of road cut slopes, thereby the safety of transport infrastructure in difficult geological environments.

Suggested Citation

  • Som Nath & Ashok Kr Singh & Harsh Kr Verma & Shubham Chaudhary & Nachiketa Rai, 2025. "Coupled effect of joint orientation and blast-induced damage zone on the stability of jointed rock slopes," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 121(6), pages 7173-7197, April.
    • Handle: RePEc:spr:nathaz:v:121:y:2025:i:6:d:10.1007_s11069-024-07080-4
    DOI: 10.1007/s11069-024-07080-4
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    1. Jagadish Kundu & Kripamoy Sarkar & Ebrahim Ghaderpour & Gabriele Scarascia Mugnozza & Paolo Mazzanti, 2023. "A GIS-Based Kinematic Analysis for Jointed Rock Slope Stability: An Application to Himalayan Slopes," Land, MDPI, vol. 12(2), pages 1-27, February.
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