The document summarizes information about the cone penetration test (CPT), a method used to determine geotechnical engineering properties of soils. It provides a brief history of the CPT, describing how it has evolved from a mechanical cone in the 1930s to electric cones in the 1960s. It then explains that the CPT involves pushing a cone tip into the ground to continuously measure resistance, and describes the components of the CPT device and how the test is conducted. Finally, it outlines the advantages and disadvantages of the CPT and how the results can be used to evaluate soil types, densities, and shear strengths for foundation design purposes.

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

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

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

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 ) .

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.
( Fig 1)

6. 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:
1. Soil type
2. Relative soil density and in-situ stress conditions
3. Shear strength parameters

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.

9. Fig 2 shows a range of cones from a mini cone at 2cm2 to a large cone of
40cm2 , The mini cones are used for shallow investigations, whereas
the large cones can be used in gravely soils.
( Fig 2) Types of cone

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

11. ( Fig 4)

12. Advantages
• Rapid test
• Economy
• identification of problem soils
• Detailed & precise data
• Real time measurement
Disadvantages
• Soil sample not obtained
• Depth limited
• Normally can’t push through
gravel
• Requires special equipment
and skilled operator

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.

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)
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