JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-Requisites

NIL

Course Objectives

To familiarize the student with the specialized knowledge on mechanism,

prediction, control of subsidence due to underground mining.

Course Outcomes

Students will get an opportunity to understand the effects of underground mining

on the surface and subsurface structures, design of methods to minimize the damage to structures and laws governing mining subsidence.

UNIT - I

Introduction: Strata movement at the mining horizon, convergence in mine working, factors influencing convergence in mine working.

UNIT - II

Subsidence Mechanism: Zones of movement in the overlaying beds, vertical and horizontal movement, subsidence trough, angle of draw, angle of break, sub-surface subsidence.

UNIT - III

Subsidence Prediction: Different methods of surface subsidence prediction – graphical, analytical, profile function, empirical and theoretical models.

UNIT - IV

Time Influence and Impact on Structures: Influence of time on subsidence, example from long wall and bord and pillar working. Calculation of ground movement over time. Types of stress on structures, stress-strain behaviour of soils, mining damage to buildings, industrial installations, railway lines, pipes, canals, etc.,

UNIT - V

Subsidence Control, Governing Laws and Standards: Measures to reduce mining damage, mining methods to minimize damage. Laws governing mining damage, different standards suggested for mining and building ground in respect of subsidence. Case studies of Mine subsidence

TEXT BOOKS:

• 1. Whiltaker B.N. Reddish D.J. - Subsidence occurrence prediction and control
• 2. Kratzsch. H, Mine Subsidence Engineering.

REFERENCE BOOKS:

• 1. B. Singh – Mine Subsidence
• 2. Peng.S. – Surface subsidence Engineering