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Matakuliah: S2094 / Rekayasa Pondasi Tahun: 2005 Versi: 1.1 Pertemuan 04 Penyelidikan Tanah.

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Presentasi berjudul: "Matakuliah: S2094 / Rekayasa Pondasi Tahun: 2005 Versi: 1.1 Pertemuan 04 Penyelidikan Tanah."— Transcript presentasi:

1 Matakuliah: S2094 / Rekayasa Pondasi Tahun: 2005 Versi: 1.1 Pertemuan 04 Penyelidikan Tanah

2 Cone Penetration Test (CPT) zOriginally Developed in Netherlands 1930s z Further developments in 1950s z“Dutch Cone” zASTM D 3441 zTypes of CPT devices ymechanical cone yelectric cone ypiezocone

3 Mechanical Cone

4 Electrical Cone

5 Cone Penetrometer

6

7 CPT Truck

8 Crawler Type CPT Truck

9 CPT Truck; Interior

10 CPT Operation; Inside the CPT Truck

11 CPT Data Acquisition & Analysis

12 Cone Penetration Test (Sondir)

13

14 cu = qc/14 (Begeman1 963) cu = fs/12 qc/N = 3-6

15 Cone Penetration Test (Sondir) zAda 2 macam yaitu : yStandard type (mantel konus) yFriction Sleeve (bikonus) zUjungnya terdiri dari sebuah kerucut (konus) 600, luas penampang 10 cm2. zDapat mencapai kedalaman 30 m, tergantung kondisi tanah. zSondir ringan 2.5 ton ; Sondir berat 10 ton zCocok untuk di Indonesia, terdapat banyak lapisan lempung yang dalam dengan kekuatan rendah. zNilai konus dalam kg/cm2 zNilai konus yang diperoleh sondir tidak dapat disamakan dengan daya dukung tanah !!

16 Cone Penetration Test (CPT) zMeasures: yCone Resistance, q c ySleeve Resistance, f sc z Typical CPT results

17 Typical CPT Data

18 Use of CPT Data

19 CPT Versus SPT zCPT: Advantages over SPT yprovides much better resolution, reliability yversatility; pore water pressure, dynamic soil properties zCPT: Disadvantages yDoes not give a sample yWill not work with soil with gravel yNeed to mobilize a special rig

20 Vane Shear Test zOriginally developed by Swedisg Engineer, John Olsson in 1920s zNow Standardized as ASTM D2573 zSpecially suited for soft, sensitive clays zQuick test, used to determine undrained shear strength

21 Vane Shear Test zRelationship between S u and applied Torque: zRelationship between S u and applied Torque (after correction factor):

22 Pressuremeter

23 Flat Plate Dilatometer

24 Comparison of In-Situ Test Methods zTable 3.5 zSimplicity & ruggedness zEase of Testing zResolution zBasis for Interpretation zTypes of Soils zEquipment Availability zPotential for Future Development

25 Comparison of In-Situ Test Methods

26 Geophysical Exploration Methods zSeismic Survey ySeismic Refraction ySeismic Reflection zElectrical Resistivity zGround Penetration Radar

27 zSeismic Survey ySeismic Refraction

28 zSeismic Survey ySeismic Reflection

29 Electrical Resistivity zGround Penetration Radar

30 Economics


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