advanced geotechnical testing · borehole drilling, sampling, in-situ testing. density low: 1/5000...
TRANSCRIPT
Introduction to Advanced Geotechnical Testing
Hsin-yu ShanDept. of Civil Eng., NCTU
Concept of Site InvestigationPurpose of site investigation
A/E projects InfrastructuresFeasibility FeasibilityDevelopment permit PlanningEarthwork permit (grading) Basic designBuilding permit (structures) Detailed design
Stages of Site InvestigationSpatial: 3D 2D 1DExtent: large middle smallTime: past presentDifficulty: simple complexDensity: low highAmount of data: small largeCost: little a lot
Spatial3D: satellite images, aerial photos, geological maps, remote sensing data2D: geophysical exploration1D: boreholes, in-situ tests
ExtentLarge: regional geology, hydrogeologyMiddle: around the siteSmall: within the site
TimeHistorical information: geological history, history of development (land use)Present: boreholes, sampling, in-situ testing
DifficultyAvailable information collectionSite reconnaissance Site investigation – geophysical surveBorehole drilling, sampling, in-situ testing
DensityLow: 1/5000 mapsMiddle: accuracy of geophysical surveyHigh: density of boreholes, 1 /600 m2
Amount of InformationLittle: reports, mapsLarge: test results
CostLow: information collection, geophysical surveyHigh: drilling and sampling, in-situ testing
Values of InformationWhat types of information do we really need?Can we get these information by the methodology we employ today?Is the resources appropriately allocated to the methods we use?
What Do We Get from a Test?Index properties of soil/rockInformation of how a soil/rock behaves under certain conditions
What Do We Really Want to Know?
How the soil/rock behave under the “REAL” conditions in the futureHow can we design certain structuresMethods to deal with difficult conditionsPotential risks
“Advanced” Testing Methods?Data acquisitionAutomated controlAutomated report/graph generation
Additional soil properties
Value of InformationReliability Risk analysisValue engineering
Lowered costHigher degree of safety
Management of InformationValue chain analysis of informationDecision support systemQA/QC of information collection processKnowledge-base system
What Does “Advanced” Testing Means?
Save timeReduce errorFlexible testing scheme
Different type of informationMore accurate
What we get from these test results is still “data”, not
“information”, nor “knowledge”
What These “Advanced”Methods Cannot Provide
Knowledge of whether the information is neededKnowledge of whether the information is correctKnowledge of the value of informationKnowledge of how to utilize the information
What an Engineer RequiresKnowledge and wisdomFormulate information from test dataGenerate knowledge from the informationObtain wisdom from the experience
Before We Want to Specify a Test to be Conducted
The relevance of the testThe accuracy of the testThe cost of the testHow can we utilize the test results
DiscussionGeotechnical investigation for 5 ha site to be used as:
Semiconductor manufacturing factorySenior high school