A Methodology for lining and design of circular mine shafts in different rock masses


Thesis Type: Postgraduate

Institution Of The Thesis: Middle East Technical University, Faculty of Engineering, Department of Mining Engineering, Turkey

Approval Date: 2013

Thesis Language: English

Student: Erdoğan Güler

Supervisor: HASAN ÖZTÜRK

Abstract:

The objective of this thesis is to predict lining thickness inside circular mine shafts. A numerical study with different rock mass strengths and different in-situ non-hydrostatic stresses are carried out in 2D shaft section models to predict pressures that develop on lining support. An iterative process of applying support pressure until observing no failure zone around shaft is used to simulate lining support pressure for each individual model. Later, regression and fuzzy logic analyses are carried out to find a pressure equation for all of the models. Finally, the pressure equation derived is used in elastic “thick-walled cylinder” equation to calculate the lining thickness required to prevent the development of a failure zone around shafts. At the end of this research, a computer program “Shaft 2D” is developed to simplify the lining thickness calculation process.