Protection of Saddle Dam from Ground Vibrations caused due to Tunnel Blasts: A Case Study

Authors

  • V. R. Sastry Professor of Mining EngineeringHead: Dept. of Training & PlacementFormer HOD: Mining EngineeringFormer Dean: Students’ AffairsDirector- Central Mine Planning & Design Institute Ltd.Director- KIOCL Limited National Institute of Technology Karnataka Surathkal, MANGALORE

DOI:

https://doi.org/10.37628/jgget.v4i2.429

Abstract

A water tunnel of 150m length is being excavated, a portion of which is passing about 20m below the flank of Bhadra Saddle Dam, made up of compacted soil. Tunnel encountered Fair to Very Strong rock formation, requiring usage of explosive energy for the excavation. Safe tunnel blasts were designed for different chainages, depending up on the rock formation, in order to protect the Saddle Dam from the ground vibrations generated. Paper describes the methodology developed and adopted for controlled blasting for tunnel excavation protecting the Saddle Dam.

References

Anon, 1997. DGMS (Tech) / S&T Circular No. 7, dated 29-08-1997.

Duvall, W.I. and Fogelson, D.E., 1962. Review of criteria for estimating damage of residence from blasting operations, USBM: 5968.

Holloway, R., Lundborg, N. and Runquist, G., 1983. Ground vibrations and damage criteria, SWEDEFO Report R85:1981.

Sastry, V.R., 2016. Design of tunnel blasts for the protection of Bhadra Saddle Dam and surrounding structures from ground vibration, An Unpublished Report.

Taquieddin, S.A., 1982. The role of borehole containment on surface ground vibration levels at closed scaled distances.

Wiss, J.F. and Linehan, P.W., 1978. Control of Vibration and blast noise from surface coal mining, USBM OPR: 103-79.

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Published

2019-01-31

Issue

Vol. 4 No. 2 (2018)

Section

Articles