Cone Penetration Test

Soil

1. Collage of Engineering Civil Engineering Department CLE614 Soil Dynamics Title : Cone Penetration Test Submitted to : Dr . Yeşim Gürtuğ ID : 20153680 By : Muftah Aljoat ID : 20152843 Adel Milad May/2016

2. History of CPT Introduction Information about CPT CPT device consists Usage of CPT Process of CPT Advantages & Disadvantages Conclusion Table of Content

3. First develop in 1930’s as mechanical cone. Electric cones develop in 1960’s. Primary device for offshore investigations since 1970’s . History of CPT

4. CPT in this time is the most used and accepted in-situ test methods for soil investigation world wide. It is to determine the Geotechnical engineering properties of soils. It was used in 1950s at the Dutch Lab for soil Mechanics so that it has also been called the ( Dutch cone test ) . Introduction

5. In (CPT), a cone on the end of a series of rods is pushed into the ground with constant rate . continuous measurements are made of the resistance to penetration of the cone and a surface sleeve. about CPT Information ( Fig 1)

6. CPT device consists video 1 CPT device consists

7. CPT are conducted to measure and evaluate characteristics of specific soils ( soft sensitive silt sand, clay, and some coarse cohesion less soils ) such as : Soil type Relative soil density and in-situ stress conditions Shear strength parameters Usages of CPT

8. After analyzing the results obtained from the test, we can determine the soil type and design of shallow foundations through the estimation of stiffness and shear strength of cohesive soils. The results from CPT may also be used, directly, for design of piled foundations in sand and gravel. Indirectly, it can be used ( shear strength ) for piles in clay. CONT…

9. Fig 2 shows a range of cones from a mini cone at 2cm 2 to a large cone of 40cm 2 , The mini cones are used for shallow investigations, whereas the large cones can be used in gravely soils. Typical Cone Sizes ( Fig 2 ) Types of cone

10. Engine Operated ( 200KN ) Hand Operated ( 30KN ) ( Fig 3)

11. Process of CPT ( Fig 4)

12. Assessment of CPT

13. Save money for the owner by more accurately identifying the geological strata. Seismic evaluations can be done to satisfy the new building code requirements by measuring the low strain for shear wave velocity. Can be used to predict vertical pile capacity. In normally consolidated or recently aged cohesion less soils, provides good estimates of settlement for shallow foundations. Conclusion

14. Cone Penetration Testing in Geotechnical Practice  written by Tom Lunne, John J.M. Powell, and Peter K. Robertson. Howstuffworks.com Southern Earth Sciences,.Inc subsurface exploration using the cone penetrometer test (paper) Cone Penetrometer Test (paper) 14 Some Key References