Raghu Satyanarayana, Ph.D. Geotechnical/Software Consultant ESC, Inc.
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1 By Raghu Satyanarayana, Ph.D. Geotechnical/Software Consultant ESC, Inc. Jean Benoît, Ph.D. Professor & Chair, Dept. of Civil Engineering University of New Hampshire
2 NGES What is NGES? Network of well-documented geotechnical test sites available to the geo-community for the purpose of advancing the state-of-the-art in areas such as in situ testing, field instrumentation, prediction of soil behavior, and foundation prototype testing.
3 NGES PURPOSES AND OBJECTIVES Stimulate development of new geotechnical tools Evaluate new and existing techniques Improve geotechnical practice and enhance research Provide educational opportunities Foster cooperation and information exchange Provide easily accessible database for all NGES data
4 NGES Why Does NGES Matter? Research conducted in and with real world conditions High quality site characterization already available Each site offers unique geological conditions Data from prior testing invaluable for future testing Cost-effective and efficient use of resources
5 NGES THE DATABASE Heart of the NGES system Contains testing results from all sites Complete profile for each site available
6 NGES DATABASE PLANNING Database should be expandable Data files should follow standard format for input Users should be able to download the data in ASCII format
7 NGES DATA STRUCTURES & FORMATTING
8 NGES DATA STRUCTURES & FORMATTING Initial literature search (late 80 s) AGS * model as a starting point Developed comprehensive data dictionary (over 1000 fields) Fields formatted based on available standards and expertise * AGS Association of Geotechnical Specialists, UK
9 NGES DATA DICTIONARY: SPT EXAMPLE Group Name: SPT Standard Penetration Test Results Status Heading Unit Description Example * SITE_ID Site identification CATIFS * HOLE_ID Exploratory hole identification number ABC.12 SPT_SSID mm Split-spoon sampler internal diameter 35 SPT_LINR Liner was used T (true)/f (false) SPT_BASK Basket retainer was used T (true)/f (false) SPT_LGTH mm Split-spoon sampler length 450 SPT_RODT Type of rods AW SPT_RODD mm Drive rod external diameter 41.2 SPT_RODW kn/m Drive rod weight per meter SPT_HAMT Hammer type Donut/Safety/Trip SPT_HAMW kg Hammer mass 63.5 SPT_HAMF m Free fall height of hammer 0.76 SPT_HAMR Hammer release mechanism Rope/Trip/Semi-Auto/Auto SPT_CATD cm Diameter of cathead SPT_ROPE Number of rope turns 2 SPT_AVLD cm Diameter of anvil SPT_ENEQ Equipment used to measure energy #1 SPT_TOP m Depth to top of test #1 SPT_CAS m Casing depth at time of test #1 SPT_CASD mm Casing diameter at test level #1 SPT_WAT m Water depth in casing at time of test 2.50 #1 SPT_NPEN mm Total penetration 450 #1 SPT_REC mm Total recovery 430 #1 SPT_INC1 Number of blows for 1st 150mm (6 in.) 6 #1 SPT_INC2 Number of blows for 2nd 150mm (6 in.) 8 #1 SPT_INC3 Number of blows for 3rd 150mm (6 in.) 8 #1 SPT_INC4 Number of blows for 4th 150mm (6 in.) 9 #1 SPT_NVAL SPT uncorrected N value (blows/0.3m); max #1 SPT_ENER Measured energy ratio 65.4 SPT_REM Remarks related to the test and equipment
10 NGES DATABASE STRUCTURE NGES SITES BOREHOLES SPECIMEN IN SITU TESTS LAB TESTS
11 NGES DATABASE STRUCTURE: IN SITU & LAB TESTS IN SITU TESTS SPT CPT PMT DMT VST etc... LAB TESTS GRAD LIMITS SP GR TRIAXIAL CONS etc...
12 Six NGES sites Over 340 boreholes NGES DATABASE STATUS Hundreds more ready for input Thirteen different in situ tests (SPT, CPT, etc.) Nine different laboratory tests (Limits, Gradation, Consolidation, etc.)
13 NGES DATA INPUT Manual input into the database Input using data capture application Excel Templates developed for all tests Enables logical data input Saves data into ASCII format ASCII data needs to be uploaded into database
14 NGES DATA INPUT: EXCEL TEMPLATES Intro Screen
15 NGES DATA INPUT: EXCEL TEMPLATES CPT Cone Selection
16 NGES DATA INPUT: EXCEL TEMPLATES CPT Updated Template
17 NGES DATA INPUT: EXCEL TEMPLATES CPT Filter Element (F.E.) Selection
18 NGES DATA INPUT: EXCEL TEMPLATES CPT F.E. Updated Template
19 NGES DATA INPUT: EXCEL TEMPLATES CPT Test Profile
20 NGES DATA INPUT: EXCEL TEMPLATES CPT Data File Selection
21 NGES DATA INPUT: EXCEL TEMPLATES CPT Addl. Measurements
22 NGES DATA INPUT: EXCEL TEMPLATES CPT Addl. Measurement Title
23 NGES DATA INPUT: EXCEL TEMPLATES CPT Addl. Measurements Units
24 NGES DATA INPUT: EXCEL TEMPLATES CPT Cone Profile
25 NGES DATA INPUT: EXCEL TEMPLATES CPT Missing Info (M.I.) Error
26 NGES DATA INPUT: EXCEL TEMPLATES CPT M.I. Updated Template
27 NGES DATA INPUT: EXCEL TEMPLATES CPT Saving to ASCII File
28 NGES FHWA s Automated Geotechnical Information and Design-aid System (AGIDS) AGIDS - System of Databases Deep Foundations Load Test Database Shallow Foundations Load Test Database National Geotechnical Experimentation Sites Database Ground Improvement Database Geotechnical Publications Database National Bridge Inventory Database
29 NGES DATA STORAGE & DISSEMINATION
30 NGES DATA STORAGE ODBC compliant Initially designed in dbase Sybase RDBMS running under UNIX environment New fields and tables can be easily added Tape backups periodically performed Secure environment/restricted access
31 NGES DATA DISSEMINATION: IN THE PAST Standalone query applications under DOS and MS Windows OS Applications distributed via diskettes, CDs, etc. Later version allowed data download from NGES website
32 NGES DATA DISSEMINATION: PROBLEMS When new data was added to the database, the entire database had to be re-distributed (downloaded) An application bug fix meant re-installing the entire application As operating systems evolved, applications needed to be upgraded Tech support was necessary to assist in installation in many cases
33 NGES DATA DISSEMINATION: SOLUTIONS Java (applets) based internet user interface application developed independent of the users OS full-fledged web application running under web browser Users need a java plug-in and need to download class files Users can search/query the database based on various parameters plot the various data (e.g., depth vs. spt blow counts, etc.) download the data in spreadsheet format
34 NGES DATA DISSEMINATION: FUTURE DIRECTIONS Query interface - need to: sign the applets so they can be seamlessly downloaded to the user s computer when changes are made to the application fix bugs in the program & add new screens create site plans so user can click on a borehole to get the required information develop printable screens using XML or similar formats Data maintenance application: preparing to release this application for site managers and/or data producers for direct data input over the internet
35 NGES DATABASE REPOSITORY Please Standby for User Interface Application Demonstration
36 NGES DATABASE USER INTERFACE APPLICATION
37 NGES DATABASE USER INTERFACE APPLICATION
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65 NGES FEEDBACK AND ACKNOWLEDGEMENTS NGES database has been demonstrated at various venues: received very favorably by geotechnical engineers, researchers, and others at educational institutions positive feedback on ease of use and usefulness of database Would like to acknowledge Mr. Al DiMillio of FHWA for his continued and enthusiastic support of the development of geotechnical databases and in particular the NGES database
66 NGES DATABASE USER INTERFACE APPLICATION Questions?
OVERVIEW OF THE NATIONAL GEOTECHNICAL EXPERIMENTATION SITES DATABASE
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