Cone Penetration Test MoDOT moving in to the future .
Cone Penetration Test (CPT) • A method used to determine the Geotechnical properties of soils and delineating soil stratigraphy.
CPT Program @ MoDOT • The program got started • To accurately predict in 1997. static resistance of a driven pile using both • The main goal was to tip and sleeve use digital technology resistance to derive to accurately determine this. geotechnical properties • To be used alternative of soils. to Standard Penetration Test (SPT).
SPT VS CPT • Its fair to say that CPT provides a better soil characterization than SPT. When no improvements are made to the current SPT method, with all its variations and uncertainties , the split spoon should be placed in the same cabinet as the slide rule and the fax machine.
SPT VS CPT Use in Missouri: • Southeast District – Bootheel of Missouri • Counties - 7 • Bridge Count – 697 • Geology – Quaternary System (>250’ of sand)
SPT VS CPT SPT CPT • • No Bentonite required Very messy process • • Quicker turnaround time Long turnaround time • • Accurate blow counts Inaccurate blow counts • • Minimized operator errors Operator errors
SPT VS CPT Mud Rotary Drilling Mud Rotary Drilling
CPT Equipment (Past) • CME 850
CPT Equipment (Past) • Rod Push System
CPT Equipment (Past) Anchors Rod Basket
CPT Equipment (Past) Old Beams Hammer
CPT Equipment (Past) • Old Computer
CPT Equipment (Past) • Old Computer in Jeep
Equipment (Current) Hogentogler Track- Mounted Rig. Push Capacity – 10 Ton Pull Capacity - 15 Ton Power - 29 Hp diesel Manufacture - Vertek (Hogentogler) Classification - Light Hydraulic Power Auger System .
Equipment (Current)
Equipment (Current) • Computer and Truck Box
Software • Hogentogler - Digital Cone Plot • Geologismiki – Cone Data Analysis • gINT – Cone Boring Plots & Data Stroage
Software • Hogentogler • Digital Cone Plot – Data Acquisition software for the cone. Plots are quickly generated and output in tabular form for use with other programs.
Software • Geologismiki (Analysis) • CPET-IT – Bearing Capacity, Settlement Calc , Pile Calc., Dissipation Interpretation. • CLiq – Liquefaction, Settlement Analysis. • Liq SV – Liquefaction (calculation using blow counts N 60 as raw data). • StoneC – Stone columns.
Software • gINT – Geotechnical and Geoenvironmental software • Used to produce boring plots. • Used to store cone data. • Used to archive information.
Software • Old Seismic Log • Old Log
Software • Old Log • Old Log
Software New Outputs • Bearing Capacity • Pile Capacity Graph
Software • LPile Sheet • Liquefaction
Future • Geoprobe 2060 CPT • Vertek Track Base System
QUESTIONS?
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