Dissertation > Excellent graduate degree dissertation topics show

Application of Multivariate Compound Extreme Value Distribution Theory to the Wave-induced Seabed Liquefaction

Author: LiuWenJie
Tutor: XuGuoHui
School: Ocean University of China
Course: Environmental Engineering
Keywords: Multivariate Compound Extreme Value Distribution Theory wave seabed liquefaction probability
CLC: X145
Type: Master's thesis
Year: 2012
Downloads: 27
Quote: 0
Read: Download Dissertation


Seabed liquefaction can bring adverse effect to coastal engineering structures, oreven cause structures damage and environmental pollution under extreme seaenvironment. Thus, the analysis of wave-induced seabed liquefaction has importantsignificance for ensuring the safety of marine engineering structures.It is necessary to comprehensively consider the dynamic load conditions, soilconditions and the initial stress conditions when judging the possibility of seabedliquefaction under wave action. Generally, the liquefaction can be accomplished whenextreme wave force acts on the seabed of which clay content is less than20%, relativewater content is equal to or greater than0.9, and buried depth is less than6m.The state equation of wave-induced seabed liquefaction is summarized, and therandom variables are analyzed. Results show that the distribution of the wave heightand wave length are both subject to Weibull distribution, the soil parameters obeynormal distrubution. The self-correlation of the soil parameters is important to study.The soil parameters data in the same depth is more uniform, therefore, thecharacteristics of soil can be represented by the statistical average in a certain area.Due to the relative distances of the different soil parameters in the same position areapproximate, it is feasible to comprehensively consider all the soil parameters.Based on the Multivariate Compound Extreme Value Distrubution Theory, a newprobability calculation method for seabed liquefaction under wave-induced cyclicloading is proposed. In the application, the probability of liquefaction is calculated byusing ISPUD software with the wave and soil properties taken into account. Theproposed method is applied to calculate the liquefaction probability of the river mouthdelta of Yellow River under8grade sea waves. The results are similar to theprobability of liquefaction which calculated by using first order second moment method.There are extreme wave-induced shear failure and liquefaction in seabed ofwhich relative water content is equal to or greater than0.9, liquidity index is greaterthan or equal to0.75, clay content is between3%and20%, cohesion is less than8kPa, and internal friction angle is less than11. It is possible to distinguish shearfailure and liquefaction using Multivariate Compound Extreme Value Distribution.When the shear failure probability is greater than the probability of liquefaction,seabed tends to shear fail under wave actions, on the contrary, seabed liquefies.

Related Dissertations

  1. The Design and Experimental Rearch of Disposable Catalyzer in the Process of Coal Liquefaction,TQ529.1
  2. The Realization of Coal Liquefaction in the Continum Model System and the Experimental Research of Coal Liquefaction,TQ529.1
  3. Realization of Fiber Optic Gyroscope Signal Processing Circuits Based on FPGA,V241.5
  4. Research on Effectiveness Evaluation Methods of Weapon Systems,TJ06
  5. Research on Dam-Break Probability Analysis Method for Dangerous Reservoir,TV697
  6. Key Technologies of Dam-break Life Loss Risk Assessment Research,TV122.4
  7. Study on the Influence of Drive Strategies on the Loss in AC Permanent Magnet Motor,TM351
  8. The Research and Realization of Medium Wave Receiver Based on Software Defined Radio,TN851
  9. Research on 8 Mm-Band Direct Detection Radiometer,TN850.7
  10. Development of Multi-Static Fixed Station High-Frequency Over-The-Horizon Ground Wave Radar Host Control Software,TN958.93
  11. Research on Navigation System Related Technology for Moving Objects under Dynamic Environment,TP301.6
  12. Research on Millimeter Wave Imaging with Scanning Array,TP391.41
  13. Stochastic Optimal Dispatch of Power System Considering Uncertain Line Failures under Extreme Weather Disaster,TM73
  14. Research on Super-resolution Reconstruction in SAR Image,TN957.52
  15. Numerical Simulation of Submarine Pipeline Self-buried Mechanism,TE973
  16. Undersea robot plow trenching machine design and analysis,TE952
  17. DR Stinson \,TN918.1
  18. Some losses renewal equation equivalent conditions for asymptotic,O211.67
  19. Wide dependency structure and tail probability random Asymptotics,O211.5
  20. The Research and Realization of Multi-Carrier Modulation Method Based on the Low-Frequency Elastic Wave Channel,TN919.3
  21. The Research of Bank Accounting Query System Supporting Top-k Query,TP311.52

CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Earth Science > Environmental oceanography
© 2012 www.DissertationTopic.Net  Mobile