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Laboratory Simulation of Flow through Single Fractured Granite

DSpace at IIT Bombay

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Title Laboratory Simulation of Flow through Single Fractured Granite
 
Creator SINGH, KK
SINGH, DN
RANJITH, PG
 
Subject MECHANICALLY COUPLED RESPONSE
DEFORMABLE ROCK FRACTURE
HIGH-VELOCITY FLOW
FLUID-FLOW
SURFACE-ROUGHNESS
NORMAL STRESS
POROUS-MEDIA
FORCHHEIMER EQUATION
NATURAL FRACTURE
CUBIC LAW
Rockmass
Single fracture
Fluid flow
Non-linear flow
Confining pressure
 
Description Laboratory simulation on fluid flow through fractured rock is important in addressing the seepage/fluid-in-rush related problems that occur during the execution of any civil or geological engineering projects. To understand the mechanics and transport properties of fluid through a fractured rock in detail and to quantify the sources of non-linearity in the discharge and base pressure relationship, fluid flow experiments were carried out on a cylindrical sample of granite containing a 'single rough walled fracture'. These experiments were performed under varied conditions of confining pressures, sigma (3) (5-40 MPa), which can simulate the condition occurring about 1,000 m below in the earth crust, with elevated base pressure, b (p) (up to 25 MPa) and by changing fracture roughness. The details of the methodologies involved and the observations are discussed here. The obtained results indicate that most of the data in the Q verses b (p) plot, fall on the straight line and the flow through the single fracture in granite obeys Darcy's law or the well-known "cubic law" even at high value of b (p) (=4 MPa) and sigma (3) (=5 MPa) combination. The Reynolds number is quite sensitive to the b (p), sigma (3) and fracture roughness, and there is a critical b (p), beyond which transition in flow occurs from laminar to turbulent. It is believed that such studies will be quite useful in identifying the limits of applicability of well know 'cubic law', which is required for precise calculation of discharge and/or aperture in any practical issues and in further improving theoretical/numerical models associated with fluid flow through a single fracture.
 
Publisher SPRINGER WIEN
 
Date 2016-01-14T11:02:13Z
2016-01-14T11:02:13Z
2015
 
Type Article
 
Identifier ROCK MECHANICS AND ROCK ENGINEERING, 48(3)987-1000
0723-2632
1434-453X
http://dx.doi.org/10.1007/s00603-014-0630-9
http://dspace.library.iitb.ac.in/jspui/handle/100/17425
 
Language en