Informatics Publishing Limited

Ragini Krishna Nikumbh ¹, K. Ram Chandar ²

Affiliations
1 Department of Civil Engineering, and National Institute of Technology, Surathkal 575 025, IN
2 Department of Mining Engineering, National Institute of Technology, Surathkal 575 025, IN

Abstract

Nowadays, a wide accessible network requires a combination of tunnels and roads through highly undulating surfaces. This study aims to assess the stress due to surrounding slope on a tunnel using ANSYS software. A circular tunnel with varying distance between the tunnel and slope, and berm width has been used for the analysis. For multiple tunnel cases, distance between the tunnels was also varied for assessing stresses. In this study, maximum and minimum stresses were obtained for a berm width of 4 and 7 m respectively, which showed that stress decreases with an increase in berm width. For multiple tunnels cases, variations in distance between two tunnels provided significant insights in the analysis of stress between the slope and tunnel.

Keywords

Berm Width, Multiple Tunnels, Numerical Analysis, Slope, Stress Distribution.

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A. G. Sangode ¹, A. G. Sangode ², A. K. Raina ³, M. N. Bagde ⁴, K. Ram Chandar ²

Affiliations
1 CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, 440001, India;, IN
2 National Institute of Technology Karnataka, Surathkal, Mangalore – 575 025, India ., IN
3 CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, 440001,, IN
4 CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, 440001, India, IN

Abstract

The paper presents the results of a comprehensive monitoring carried out to study the extent of blast-induced damage experienced by rockmasses extracted by cut and fill stoping in a manganese mine. Damage is related to strain generated by the blasting and it is found to correlate well with the particle velocity. The particle velocities were measured in the studied mine with seismographs. The attenuation equation for extrapolation of vibration to the near field was derived from the data thus acquired. The site-specific damage model for designing the safe blast parameters was thus devised to minimize the extent of the blast-induced damage to protect the hanging wall, footwall and friable orebody and thus overall improving the stoping environment. The presented work aims at improving the understanding of the influence of blasting on the backfilled area and hard rock in the stoping environment. The damage predicted by different methods and the final strategy for blasting for wall control and productivity are documented in the paper  .

Keywords

Blast-Induced Damage, Cut and Fill Stoping, Peak Particle Velocity

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