Cone Penetration Test MoDOT moving in to the future . Cone - PowerPoint PPT Presentation

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?