information required for rock mechanics modelling & design
Post on 15-Apr-2017
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INFORMATION REQUIRED FOR ROCK MECHANICS MODELLING AND DESIGN
MUHAMMAD ANUS14MN36 DEPARTMENT OF MINING ENGINEERINGMEHRAN UNIVERSITY OF ENGINERERING AND TECHNOLOGY, JAMSHORO
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WHAT IS MODELLING ?Process of creating and analyzing a physical model to predict its performance in the realworld.
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WHAT IS ENGINEERING DESIGN ?It is the process of devising a system, component or a process to meet the desired needs.
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OBJECTIVESQUESTIONS
Is supporting information is adequate ?
Have all parameters included In modeling ?
Are the values accurate and precise ?
ANSWER IS..The information required is a function of the modeling methods chosen for the initial and final design.4
Flowchart for rock mechanics modeling & design approaches5
A: Pre-existing standard methods Information required :
In situ stress
project information
orientation of excavation cross-sections
rock mechanics parameters such asUni-axial compressive strength, , , , C.
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B: Analytical methodsSame as Method ARequire parameters used in the analytical formulae.ExampleKirsch solution-----Field stresses
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C : Basic numerical methods Two numerical approaches;
CONTINUUM APPROACH:Excavation typeproject informationMechanical parameters of intact rock
2. DISCRETE APPROACH:Geometrymechanical parameters of faults/joints
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D: Extended numerical methods
Require complete Information on:
Inhomogeneity
Thermal parameters
Hydrogeological parameters
Hydrogeochemical parameters
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Precedent type analysis (PTA)
PTA done by using different Empirical approaches.
Rock mechanics parameters
Rock mass structure
Weathered degree
Tunnel geometry 10
Rock mass classification
Information required :
Q-system
Rock Mass Rating (RMR)
Geological Strength Index (GSI) 11
REFERENCESNumerical methods in rock mechanics by L. Jinga & J.A. Hudson.
Specifying the information required for rock mechanics modelling and rock engineering design by Xia-Ting Feng & John A.Hudson.
When is there sufficient information from the site investigations by Andersson JA, Munier R, Strom A, Soderback B, Almen KE, OlssonL.12
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