Pertemuan 04 Penyelidikan Tanah

Presentasi berjudul: "Pertemuan 04 Penyelidikan Tanah"— Transcript presentasi:

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

2 Cone Penetration Test (CPT)
Originally Developed in Netherlands 1930s Further developments in 1950s “Dutch Cone” ASTM D 3441 Types of CPT devices mechanical cone electric cone piezocone

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 Cone Penetration Test (Sondir)

14 Cone Penetration Test (Sondir)
cu = qc/14 (Begeman1963) cu = fs/12 qc/N = 3-6

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

16 Cone Penetration Test (CPT)
Measures: Cone Resistance, qc Sleeve Resistance, fsc Typical CPT results

17 Typical CPT Data

18 Use of CPT Data

19 CPT Versus SPT CPT: Advantages over SPT CPT: Disadvantages
provides much better resolution, reliability versatility; pore water pressure, dynamic soil properties CPT: Disadvantages Does not give a sample Will not work with soil with gravel Need to mobilize a special rig

20 Vane Shear Test Originally developed by Swedisg Engineer, John Olsson in 1920s Now Standardized as ASTM D2573 Specially suited for soft, sensitive clays Quick test, used to determine undrained shear strength

21 Vane Shear Test Relationship between Su and applied Torque:
Relationship between Su and applied Torque (after correction factor):

22 Pressuremeter

23 Flat Plate Dilatometer

24 Comparison of In-Situ Test Methods
Table 3.5 Simplicity & ruggedness Ease of Testing Resolution Basis for Interpretation Types of Soils Equipment Availability Potential for Future Development

25 Comparison of In-Situ Test Methods

26 Geophysical Exploration Methods
Seismic Survey Seismic Refraction Seismic Reflection Electrical Resistivity Ground Penetration Radar

27 Seismic Survey Seismic Refraction

28 Seismic Survey Seismic Reflection

29 Electrical Resistivity
Ground Penetration Radar

30 Economics