JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives

To familiarize the students with highly specialized subject of design of

rock breaking techniques with more emphasis on computational models controlled blasting, instrumentation for monitoring blasting operations in mines.

Course Outcomes

Although shot firer supervisor the drilling and blasting operation

statutorily any mines, students are expected to have detailed knowledge on rock fragmentation techniques. This course enables the student to have clear perception of rock fragmentation techniques and its field applications.

UNIT - I

General theory of rock cutting, selection of cutting tools for optimum penetration and wear characteristics. Mechanics of rotary, percussive and rotary-percussive drilling, short and long hole drilling equipment, different types of bits, bit wear, drilling in difficult formations, drillibality of rocks, drilling performance and costs.

UNIT - II

Mechanism of rock breaking machines, Pneumatic and Hydraulic rock hammers. Mechanics of rock fragmentation and fracture by explosive action, Types of explosives, Blasting accessories, blasting parameters, design of blasting rounds for opencast and underground mines, Blastability of rocks, blasting efficiency, mean fragment size.

UNIT - III

Computational models of blasting, transient ground motion, misfires, blown out shots, incomplete detonation – their cases and remedial measures.

UNIT - IV

Controlled blasting techniques, perimeter blasting, safety precautions, ground vibrations and air over pressure from blasting.

UNIT - V

Instrumentation in blasting, Borehole pressure transducer, V.O.D probe, vibration monitor, high speed video camera. Impact of ground vibration and sound on the neighboring structures and communities, and mitigative measures.

TEXT BOOKS:

• 1. P. Pal Roy Rock Blasting effect and operation, A A Barkolna 2005
• 2. S. K. Das Explosive and Blasting Practices in Mines Lordy Prakashan, 1993 B.TECH. MINING ENGG.

REFERENCE BOOKS:

• 1. B. H. Garg: Blasting Operation, McGraw Hill, 1981
• 2. CP Chugh, Drilling Technology Handbook, Oxford & IBH, 1977 B.TECH. MINING ENGG.