Laboratory simulation experiment on dissolution of limestone under hydrodynamic pressure

To study the dissolution mechanisms of limestone driven by hydrodynamic reservoir pressure during different storage periods, a simulation experiment on the limestone in a hydropower station of Wujiang River in China was performed. Using a set of specially designed pressure corrosion equipment in an...

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Bibliographic Details
Published in:Carbonates and evaporites 2013-05, Vol.28 (1-2), p.3-11
Main Authors: Liu, Qi, Lu, Yaoru, Zhang, Feng’e
Format: Article
Language:English
Subjects:
Carbonate rocks
Carbonates
Corrosion
Damage
Dissolution
Dissolving
Earth and Environmental Science
Earth Sciences
Electron microscopy
Experiments
Geology
Hydrodynamic pressure
Hydrodynamics
Hydroelectric power
Hydroelectric power stations
Limestone
Membrane permeability
Mercury
Mercury surface
Mineral Resources
Mineralogy
Open systems
Original Article
Permeability
Porosity
Pressure
Ratios
Rivers
Scanning electron microscopy
Simulation
Storage
Temperature
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Summary:To study the dissolution mechanisms of limestone driven by hydrodynamic reservoir pressure during different storage periods, a simulation experiment on the limestone in a hydropower station of Wujiang River in China was performed. Using a set of specially designed pressure corrosion equipment in an open system, the experiment simulated the dissolution process of limestone under hydrodynamic pressure (0–2.0 MPa) and temperature (15–85 °C). Results show that the amount of dissolution and its rate increase with hydrodynamic pressure and rising temperature, as a result the curve of dissolution rate is obviously changed. In addition, dissolution of carbonate rocks includes both chemical dissolution and physical damage. Differing from the situation under atmospheric pressure, with hydrodynamic pressure rise chemical dissolution, and physical damage increased synchronously ratios tending to be one-to-one. Results show that there is a coupling relationship between chemical dissolution and physical damage leading to a degree of more aggressive dissolution. Microscopic research based on scanning electron microscopy and a mercury injection test shows that the dissolution not only affects the surface of the rock, secondary pore, and mineral form, but also the inner pore structure, decreasing the permeability and connection among the structural planes of the rock.
ISSN:0891-2556
1878-5212
DOI:10.1007/s13146-013-0159-0