Dissertation > Excellent graduate degree dissertation topics show

The Research on Measuring Stress Changes of Rock Utilizing Rayleigh Wave and the System Implementation Based on Virtual Instrument

Author: XinWei
Tutor: WangBaoShan
School: China Seismological Bureau, Institute of Geophysics
Course: Solid Earth Physics
Keywords: Rock Wave velocity variation Stress change Rayleigh wave polarization Virtual instrument Experimentalism
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 7
Quote: 0
Read: Download Dissertation

Abstract


Utilizing seismic wave to research the time-varying stress state of fault systems is one of the most important fields for seismologists. It supplies an impossible underlying way to predicting earthquakes, while impelling the application of geophysics.The change of the stress on rock leads to the variation of the wave passing through, which utilizing elastic wave detects the state of stress was based on. Amid parameters of elastic wave, the seismic wave velocity is easy to estimated while it can reach a high precision, nevertheless, high precision measurement of wave velocity need a high requirement in launch and accept instrument. In recent times lots of numerical results and experimental results show that:the polarization of Rayleigh wave maybe more sensitive than seismic velocity to the stress of rock. We try to realize the technology using Rayleigh wave to estimated stress change in lab so as to serve the observation to earth media, and we did work as follows.1. Utilizing the high-speed data acquisition card, We build a measuring system which is based on virtual instrument technology and with universalty. It was found that:(1) It got an eminent stability:We drive the system running smoothly nearly one year, and we found no damaged and missed record due to software problems. (2)The system can fit different situations such as exciting active resource in different scale and receiving with multichannel, it got an excellent universality. (3)Utilizing the high speed data acquisition card the system improves the trigger precision to improve the measuring precision.2. We research the sensitivity of Rayleigh wave polarization to stress of rock.:A laboratory experiment was conducted, in which repetitive ultrasonic were excited to pass through the marble then received by an three-component sensor, aiming to make full use of the wave to study the variation of Rayleigh Wave Polarization and Velocity of Different Seismic Phases with the State of Stress. It was found that: (1)The stress sensitivity of different seismic phases velocity is 10E-8/Pa, with a descending order:Rayleigh wave> S wave> P wave.(2)The larger the stress, the more intense the Rayleigh polarization is, and the changes are nonlinear.(3)The stress sensitivity of Rayleigh polarization is times greater than wave velocity.3.We try to use Rayleigh wave polarization to analyze the data of active source outdoors experiment in Yunnan province. We found that the polarization changes more sharply than velocity, while shows a diurnal fluctuation.

Related Dissertations

  1. Study of Automobile Ignition Coil Testing System Based on Standard LAH032.905,U472.9
  2. Rock-fill Concrete Experiments on Comprehensive Properties and Studies on Thermal Stress,TU528
  3. Study on the Variation of Soil Clay Minerals and Influence Factors in Karst Regions under Different Rocky Desertification, Southwest China,X171
  4. Development of Tractor’s Virtual Instrument System Based on CAN Bus,S219.02
  5. Down-regulation of ROCK Isoforms on Migration and Proliferation of Vascular Smooth Muscle Cells Stimulated by PDGF,R363
  6. Halahatang depression Marine Petroleum Geochemistry,P618.13
  7. LabVIEW-based virtual oscilloscope design and remote control,TM935.3
  8. CAN bus technology in the meteorological monitoring System Research and Implementation,P409
  9. Metallogenic Geochemistry Study of the Mn Deposit in Hougou-Dapingshan in Mianxian, Shanxi Province,P618.32
  10. Engineering Control Technology of Tunnel,TD353
  11. The Stability Analysis of Earth-Rock Dam with Fluid-Structure Interaction Effect,TV641
  12. Study the Mechanism of a Small Molecule RhoA Inhibitor, Hl07, on Vasodilation,R96
  13. The Study of Stability and Deformation for Cao Mao Mountain Tunnel,U451.2
  14. Research and Application of Remote Virtual Instrument Experimental Teaching System Based on LabVIEW,TP391.6
  15. The Study on Rock Mass Stregnth Randomenss and Reliabilityof Slope,TD854.6
  16. Research on Thin-Film Hysteresis Loop Measurement System Based on Extraordinary Hall Effect,O484.43
  17. Elementary Exploration in Applying Vegetable Oil to Study and Make Phosphorite Flotation Reagents,TD923.1
  18. Research on Automatic Measurement Technology of Pitch Diameter for the Rzeppa Joint Housing Raceways,TG80
  19. The Research on Test System of the Relay’s Electrical Properties and Experiment,TM58
  20. Design and Implementation of Lung Sound Analysis System Based on Virtual Instrument,TP274
  21. The Research and Application of Virtual Instrument Technology in Sensor Intelligent Measuring System,TP212

CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
© 2012 www.DissertationTopic.Net  Mobile