International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 09 | Sep 2025
p-ISSN: 2395-0072
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Optimization of Blast Operations in Tunneling - A Case Study in the Himalayas Akshita Bangwal1 1M.Tech student, Department of Mining Engineering, College of Engineering and Technology, Maharana Pratap
University of Agriculture and Technology, Udaipur, Rajasthan, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Blasting performance in tunneling
on blasting outcomes in tunnel construction. Critical factors such as rock type (lithology), rock mass classification, joint orientation, and rock strength play a significant role in determining fragmentation quality, the extent of overbreak and underbreak, and the level of blastinduced vibrations. Understanding these variables is fundamental to designing effective blasting strategies that improve excavation quality while minimizing structural damage and safety risks. The research focuses on assessing the performance of different blasting techniques based on parameters like fragmentation efficiency and vibration control. It included an evaluation of explosive consumption, drilling efficiency, and the overall effectiveness of blasting operations. The objective is to identify the most efficient and cost-effective blasting method using a data-driven analysis. By integrating geological evaluations, blast performance assessments, and economic considerations, this study aims to contribute to more efficient and sustainable tunneling practices. The insights gained supported the development of optimized drilling and blasting techniques, especially for geologically complex and sensitive environments.
operations is strongly influenced by geological factors and rock characteristics, which determine excavation effectiveness, cost-efficiency, and safety. This study examines these parameters to improve drilling and blasting outcomes. The main objective is to analyze how geological and rockrelated variables—such as lithology, rock mass classification, joint orientation, and strength affect results. These factors influence fragmentation, overbreak /underbreak, and blastinduced vibrations. Different blasting techniques, including conventional blasting, pre-splitting, and smooth blasting, were evaluated against performance indicators such as fragmentation quality, vibration reduction, flyrock control, and overbreak regulation. Empirical observations, numerical simulations, and field data were combined to assess the effectiveness and safety of each technique. A comparative cost framework was developed, considering explosive use, drilling efficiency, equipment utilization, cycle time, and material loss. The economic evaluation identified the most cost-effective and feasible tunneling method. Overall, the study enhances understanding of blasting efficiency by integrating geological, engineering, and economic perspectives, contributing to better excavation practices in sensitive terrains like the Himalayas.
1.1 Related literature and studies Tunneling in the Himalayas is highly complex due to unpredictable geology, high overburden, and variable rock strength. Numerous studies have highlighted these challenges and proposed adaptive solutions. Srivastav et al. (2024) reported unstable rock masses along the RishikeshKarnaprayag railway line, requiring customized excavation strategies. Similarly, Azad et al. (2022) showed that the NATM method offered more reliable assessments than RMR in the Garhwal Himalayas. Mei et al. (2021) optimized blasting parameters in the Panlongshan Tunnel, reducing overbreak and improving tunnel profiles. Verma et al. (2021) applied modified pre-splitting techniques at the Kol Dam project to stabilize slopes in jointed rock. Extreme conditions in the Rohtang Tunnel were documented by Reichenspurner and Riedel (2020), where NATM and controlled blasting proved effective. Upadhyay and Singh (2017) stressed flexible excavation measures like preinjection grouting and umbrella roofing. Historical analyses by Cardu and Seccatore (2016) proposed new prediction methods for rock behavior, while Alipour et al. (2012) improved charge estimation using neural networks. Spathis
Key Words: Tunneling, Drilling and Blasting, Blast Optimization, Rock Mass Properties, Fragmentation, Cost Evaluation, Vibration Control.
1.INTRODUCTION Tunneling plays a crucial role in infrastructure development, especially in regions where surface excavation is not feasible due to challenging geological conditions. Among the most reliable and widely used excavation methods in hard rock environments are drilling and blasting. However, the effectiveness of these techniques is highly influenced by subsurface geological characteristics, the nature of the rock mass, and the specific blasting approach employed. Therefore, optimizing drilling and blasting is essential to enhance excavation speed, reduce environmental impacts, lower operational costs, and ensure worker safety. This study primarily aims to evaluate the influence of geological conditions and rock characteristics
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