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I. An overview

I. An overview. Geotechnical Features Problematical => Need to go through the soil How doing it ?. I. An overview. Geotechnical Features Problematical => Need to go through the soil How doing it ? What it depends of? The nature of the soil :

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I. An overview

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  1. I. An overview • Geotechnical Features Problematical => Need to go through the soil How doing it ?

  2. I. An overview • Geotechnical Features Problematical => Need to go through the soil How doing it ? What it depends of? The nature of the soil : - hard ground - soft ground The size of the hole we need

  3. I. An overview • Geotechnical Features a) Drilling precautions Drilling consists of breaking the cohesion of soil particlesThese particles could create several problems -> How to avoid it? • Evacuation of the destructed materials • Cooling of the drilling head • Walls: - to avoid rock crumbling - with bentonite or casing

  4. I. An overview • Geotechnical Features a) Drilling precautions

  5. I. An overview • Geotechnical Features a) Drilling precautions b) Hard ground drilling devices The trepan: Oldest technique Create a shock in rock with the blade Evacuation with water Heavy blade

  6. I. An overview • Geotechnical Features a) Drilling precautions b) Hard ground drilling devices The pneumatic hammer: Most used technique Create a rotation to get a better drilling Metal mass moved by a flux of air in body Could be handled or mounted in a frame

  7. I. An overview • Geotechnical Features a) Drilling precautions b) Hard ground drilling devices The tricone: Fastest technique (15 m per day) Tooth made of heavy metal Rotation process Injection of mud and water & cooling

  8. I. An overview • Geotechnical Features a) Drilling precautionsb) Hard ground drilling devices c) Drilling a soft ground The auger: Most used technique Could drill big diameters Rapid Also Shovels, deflection, high pressured water…

  9. II. Precise drilling Application • Project Presentation What? 300 meters long directional drilling under a river and a train way For? A pipeline Why? Protection of environment Global costs reduced No loose for agriculture Need of a geotechnical survey

  10. II. Precise drilling Application • Project Presentation • Geotechnical survey Rapid look of the zone: - geologic map - aerial photography Precise tests: - 3 core drillings - Radiography of the zone Look at the results

  11. II. Precise drilling Application • Project Presentation • Geotechnical survey 3 different areas: - alluvium (sand & pebbles) - - limestoneTry to avoid alluvium => Deepest path drilling Need of a resistive drill to go through the limestone How to manage the drill

  12. II. Precise drilling Application • Project Presentation • Geotechnical survey • Material solutions Look at the results

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