Browsing by Author "Suman Panthee"

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Analysis of Joint Parameters to Understand it’s Effect on Rock Blasting
(Springer Science and Business Media Deutschland GmbH, 2022) Rajesh Silwal; Suman Panthee; Ashutosh Kainthola
Rock mass consists of intact rock material and joints. Different joint parameters like orientation, spacing, persistence, aperture, infilling play important role in tunnel excavation. In drill and blast tunnel excavation, the propagation of blast shock wave differs from one rock mass to another rock mass based on their properties, because of which nature of rock fragmentation differs. All these directly affects the outcome of tunnel blasting. This study establishes the relationship between different joint parameters and excavation volume. In order to do so four different tunnel section of same tunnel alignment, with different joint properties were chosen and then collected data was processed to understand how different joint properties lead to different excavation volume within same tunnel. It was found that when the strike of the joint is parallel to the tunnel axis, the excavation volume obtained from blasting is comparatively higher than that when strike of joint is perpendicular to the tunnel axis, because when joints are parallel to the tunnel axis there is minimum reflection of blast wave from joint plane causing it to travel farther, increasing the fragmentation process. Shape analysis of blast fragments and natural rock block obtained from 3DEC was done in order to find the effect on fragmentation process. It was found that both blast fragments and natural rock block have similar percentage of different shape class proving fragmentation process during blasting of rock mass follows joint pattern, since they are the weak surface in rock mass. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Comparative study of the deformation modulus of rock masses—a reply to the comments received from Gokceoglu (2018)
(Springer Verlag, 2018) Suman Panthee; P.K. Singh; Ashutosh Kainthola; Ratan Das; T.N. Singh
Availability of information on the deformation modulus in the initial stages of civil engineering projects related to near-surface or underground excavation is very important for design purposes. However, direct determination of the deformation modulus is a challenging task and a potentially costly one; therefore, several researchers have frequently used indirect methods to assess the deformation modulus. Of the significant number of empirical equations that can be found in literature, most are non-linear, which makes the deformation modulus a parameter that is very sensitive to the quality and types of data used. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
Engineering geological characteristics and failure mechanics of Jure rock avalanche, Nepal
(Springer Science and Business Media Deutschland GmbH, 2023) Suman Panthee; Suman Dulal; Vishnu Himanshu Ratnam Pandey; Vikas Yadav; Prakash Kumar Singh; Ashutosh Kainthola
Introduction: The rock avalanches are a frequent and disruptive phenomenon in the Himalayas and other mountain chains. To minimize future losses, it is essential to investigate the engineering geological causative factors and mechanism of these mass wasting events. Study area: The present work is aimed at assessing the failure mechanism of the disastrous 2014 Jure rock avalanche along Araniko Highway, Northern Nepal. The event had blocked the Sunkoshi River and blocked an economically significant route to China. Geotechnical properties and analysis: Initially, rockmass characterization and intact strength attribute were determined for the site to classify the failure zone. The parameters measured and obtained from the field and laboratory were integrated into the analytical models to obtain a conclusive interpretation of the failure mechanism. Structural, kinematic, and key block theory analyses have been carried out for decipher the evolution of the failure zone. Results and discussion: Rock mass was found to be of fair quality, however, the structural instabilities and the presence of water has led to a progressive failure. Movement of the key block and subsequent sliding of wedges and foot failure appears to be a possible failure mechanism. Conclusion: The present research explores the contributory engineering geological aspects of the Jure rock avalanche. The investigation results can be used to tackle similar large scale rock avalanches in similar geological terrains and thus minimizing the losses. © 2023, The Author(s).