433225288-Vane-Shear-Test (1).pptx ziauddin

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1. http://www.free-powerpoint-templates-design.com FIELD VANE SHEAR TEST

2. REPORTERS FOR TODAY JOHN FEL Reporter 1 CZARLON Reporter 2 SALIC Reporter 3 ALDRIN Reporter 4

3. ALEC SKEMPTON 1948 First to demonstrate the field vane shear test and concluded that the field vane test provided an efficient method of obtaining the sensitivity of soil

4. What is….. Field Vane Shear Test 01 Undisturbed vs Remolded 02 Soil Sensitivity 03 Let us define first the basic things you have to learn in this topic

5. Field vane shear test The vane shear test is an in-situ geotechnical testing methods used to estimate the undrained shear strength of fully saturated clays without disturbance. The test is relatively simple, quick,  and provides a cost-effective way of estimating the soil shear strength; therefore, it is widely used in geotechnical investigations.

6. UNDISTURBED VS REMOLDED Undisturbed soil is a type of soil that has its internal structure unmodified and undisturbed. Remolded soil is a type of soil  that has had its natural internal structure modified or disturbed by manipulation so that it lacks shear strength and gains compressibility

7. SOIL SENSITIVITY Soil sensitivity  is defined as the ratio of peak to remoulded shear strength Soil sensitivity  is an  important  measure of the loss of strength and structure in the  soil  body under the effect of static or seismic loading S = Undisturbed Shear Strength / Remolded

8. PROCEDURE FIELD TEST 02 03 04 Begin Penetration 01 SET-UP 05 Penetrate first 20 cm Twist the device (for undisturbed) twist again for (remolded) Repeat 3 and 4 until desired depth

9. 1956 Opposed past conclusions and concluded that only laboratory vane shear test is reliable indicators of soil sensitivity. W. J. Eden and J. J. Hamilton

10. Lab Vane Shear Test Under special condition, the vane shear test can be also carried out in the laboratory on undisturbed soil specimens; however, the use of the vane shear test in in-situ testing is much more common. The laboratory vane shear test for the measurement of shear strength of cohesive soils. This test gives the undrained strength of the soil, in undisturbed as well as remoulded conditions both.

11. Vane Shear Apparatus Specimen Specimen Container Calipers Equipments :

12. PROCEDURE LAB TEST 02 03 04 Mount the specimen container with the specimen on the base of the vane shear apparatus and fix it securely to the base. 01 Prepare two or three specimens of the soil sample of dimensions of at least 30.0 mm diameter and 75 mm long specimen. 05 Lower the shear vanes into the specimen to their full length without disturbing the soil specimen. The top of the vanes should be atleast 10 mm below the top of the specimen. Rotate the vanes at a uniform rate by suitably operating the torque applicator handle until the specimen fails. Note the final reading of the torque indicator. Rotate the vane rapidly through 10 revolutions. The remoulded strength should then be determined within 1 minute after completion of the revolution.

13. Benefits and Consequences easy and quick to perform can also be performed in the laboratory ideal for the determination of undrained shear strength of non-fissured and fully saturated clay can also get the shear strength of soft clays at greater depth not suitable for clay which contains sand or silt laminations cannot be conducted on fissured clay if the failure envelope is horizontal, it does not give accurate results

14. “ Save the Earth, Our Mother, Conserve and protect our Water, Do it now, not Later, Or We will Suffer, Forever.”

15. Thank You!