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Characterization of carbon dioxide leakage process along faults in the laboratory

Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 674-688页

作者： Lifeng Xu Qi Li Yongsheng Tan Xiaochun Li State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

It is important to understand the process of multiphase carbon dioxide(CO_(2))leakage in faults for the risk assessment of carbon capture and storage(CCS).To quantitatively characterize the CO_(2)leakage process in the fault,pressure sensors,fiber Bragg grating(FBG)temperature and strain sensors were simultaneously used to monitor CO_(2)leakage in the *** experiments were carried out,including five groups of gaseous CO_(2)leakage tests with initial pressures of 1-5 MPa and five groups of liquid CO_(2)leakage tests with initial pressures of 6-10 *** results indicate that when liquid CO_(2)leaked with an initial pressure of 7-10 MPa,the pressure and temperature of CO_(2)dropped rapidly in the first few seconds and then remained *** behavior that CO_(2)continues to leak while maintaining temperature and pressure unchanged is defined as“temporary pseudo-sealing(TPS)”behavior,which continues for the first 1/3 of the leakage ***,this TPS behavior did not occur in gaseous CO_(2)*** only the pressure and temperature data were used to evaluate whether CO_(2)leakage occurred,we would misjudge the risk of leakage in CCS projects during the TPS *** causes and conditions of TPS behavior were further studied *** results show that:(1)TPS behavior is caused by the phase transition energy generated when liquid CO_(2)leaks.(2)The condition for TPS behavior is a small leak aperture(0.2 mm).Only a small leakage rate can make the phase transition energy and pressure change from a dynamic equilibrium,and(3)The compression zone caused by the Bernoulli effect and fault“barrier”could reduce the CO_(2)leakage rate and further promote the occurrence of TPS *** study provides technical and theoretical support for the quantitative characterization of the CO_(2)leakage process in faults of CCS projects.

关键词： Carbon dioxide(CO_(2))leakage Fault strain Temporary pseudo-sealing(TPS) pressure front Fiber bragg grating(FBG)sensor Risk management

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Corrosion Processes in the Concrete of the Dams

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Journal of Civil Engineering and Architecture 2013年第4期7卷 414-421页

作者： Mark A. Sadovich Tatyana F. Shlyakhtina M. Kuritsyna Department of Technology Bratsk State University Bratsk 665 709 Russia

During the whole operation life of Bratsk and Ust-Ilimsk hydroelectric plants, chemical analysis of water filtering through the pressure front of the concrete dams was under systematic monitoring by sampling in places of concemrated outcome in the inspection galleries of a dam. Long-term cumulative observations made up a basis for study of the indicated dams concrete corrosion caused by the Angara water in the process of its filtration through the cracks formed in the period of the dam erection, through construction joims and other defects. Mathematical-statistical analysis allowed the classification the processes of corrosion from the point of view of their time dynamics and divided them correspondingly into stationary （stable） and non-stationary. On the basis of a calculation of the cement stone componem removal along with the ideas of the process dynamics the pressure from filtration developmem forecast has been made and their danger level has been estimated. The developed conception is of rather a general character and can be used when analyzing the state of concrete dams of the Angara cascade and other similar cases.

关键词： Concrete corrosion concrete endurance water filtration filtration seepage dam pressure front leaching component removal.

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