Autoadaptive media in geotechnical earthquake engineering
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AutoAdaptive Media in Geotechnical Earthquake Engineering. Report of the Shoal Creek Discussion Group Research & Applications Austin, January 10-12, 2001. AutoAdaptive Media in Geotechnical Earthquake Engineering GENERAL RESEARCH AREAS. Seismic Ground Hazard Assessment

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AutoAdaptive Media in Geotechnical Earthquake Engineering

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AutoAdaptive Media in Geotechnical Earthquake Engineering

Report of the Shoal Creek

Discussion Group

Research & Applications

Austin, January 10-12, 2001

Shoal Creek Discussion Group


AutoAdaptive Media in Geotechnical Earthquake EngineeringGENERAL RESEARCH AREAS

Seismic Ground Hazard Assessment

Pre-Earthquake Hazard Mitigation

Realtime EQ Monitoring & Seismic Response

Post-EQ Health Monitoring & Detection

Shoal Creek Discussion Group


Seismic Ground Hazard AssessmentFocus Areas

Liquefaction Potential

Landslides and Slopes

Microzonation & Site-Specific Soil Properties Determination

Site Response & Ground Amplification

Shoal Creek Discussion Group


Pre-Earthquake Hazard MitigationFocus Areas

Soil Densification and Improvement

Foundation Systems Improvement

Construction QA/QC

Slope Stabilization

Shoal Creek Discussion Group


Realtime Earthquake MonitoringFocus Areas

Ground Motions (horiz. & vert. arrays)

Porewater Pressures

Permanent Deformations (GPS; Utilities made with smart alloys)

GIS with all data monitors networked

Shoal Creek Discussion Group


Post-Earthquake Health MonitoringFocus Areas

Permanent Deformation Measurements

Integrity Testing

Soil and Rock Instability

Residual Porewater Pressures

Shoal Creek Discussion Group


Geotech EQE Problems & Needs

Accurate measurements of low-strains in lateral load tests

Measurements of soil stresses

Dynamic Strain Measurements

Soil Sampling of Clean Sands

Calibrating Sensor In-Situ for Tornado Detection

Shoal Creek Discussion Group


Geotech EQ Problems & Needs

Measuring Strains Due to Blasting

Pressure Transducers to Survive Blasts and still Measure Low-Pressures, Integrating Deflection Sensors

Measurements of Pile Lateral Deflections, also Gaps

Position Sensitive Detector (PSD) to Measure Displacement & Vibration

Shoal Creek Discussion Group


Problems & Needs

Array of sensors and receivers to measure changes in wave velocity during induced liquefaction

Transducers to excite vibrocone (piezo-actuator)

Deflection sensors matching ground impedance and density

In-Situ Dynamic Strain & Damping Measurements

Shoal Creek Discussion Group


Research & Solutions Using AAM

  • Installation of 3-D array of MEMs and/or Piezo Stacks for Tomographic Mapping of Vs during Liquefaction

  • Blast-Induced Liquefaction at Treasure Island/CA and Cooper River Bridge/SC

Shoal Creek Discussion Group


Research & Solutions Using AAM

  • Liquefaction Effects on CPT qc and in-situ Vs

  • Time effects on qc and Vs after liquefaction

  • Arrays of MEMs and Piezoelectric Stacks (BE)

Shoal Creek Discussion Group


Sampling Methods

  • Magneto-Rheological Drilling Fluids

  • Impregnates clean sands for undisturbed samples until confined within triaxial apparatus

Shoal Creek Discussion Group


Site Characterization Methods

  • Vibrocone Penetrometer for Site-Specific Liquefaction Evaluation

  • Dynamic Forces imparted by piezostack for controlled frequency, displacements, & loads.

Shoal Creek Discussion Group


Advanced Geotechnical Exploration

  • Opto-electro-mechanical sensors with digital output for subsurface image collection at variable focal lengths.

  • Enhancement on the VisCPT concept for high-resolution stratigraphic profiling.

Shoal Creek Discussion Group


Lifeline/Utility Connections

  • Shape-memory alloys

s

e

Shoal Creek Discussion Group


Advanced Reinforced Earth Structures

  • Use principles of active dampers from buildings to reinforced earth retention walls & embankments.

  • Piezo-polymer geosynthetics (“smart geosynthetics”)

Shoal Creek Discussion Group


AAM Ground Improvement

  • During seismic event, Smart System controls pump drawdown from wells to reduce excess porewater pressures.

  • Vacuum consolidation

Shoal Creek Discussion Group


Self-Diagnosing Foundation System

  • Fiber optics and/or Time Domain Reflectometry (TDR).

  • Self-Leveling Foundation Systems

Shoal Creek Discussion Group


Need Permanent DeformationMeasurement Devices

  • GPS

  • Measure barometric pressures with AAM ?

  • PSD (position sensitive detector)

  • SAR (remote sensing)

  • TDR

Shoal Creek Discussion Group


Permanent Deformations

  • Network System of Motes (Glaser)

  • Each Mote connected to a vertical or angled fiber optics sensor (hybrid AAM)

Shoal Creek Discussion Group


Centrifuge Modeling with MR fluid soils

  • Where do the sand particles go when liquefaction occurs

  • Use sand with mixed magneto-rheological properties

  • Magnetic sensing tools to trace where the sand flowed

Shoal Creek Discussion Group


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