CHAPTER 1 EC110 Shear VANE Presentation PDF

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ECG353 EC110 PRESENTATION SLIDE FOR CHAPTER 1
SHEAR VANE TEST - PRESENTATION SHORT SUMMARY LECTURE NOTES...

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SHEAR VANE PRESENTATION

1. What is the use of vane shear test? It is used to determine the undrained shear strength & insitu of soils especially very soft and sensitive clays which had a diameter of 75mm and & length of 150mm. Vane shear test gives accurate results for soils of low shear strength. 2. How do you perform a vane shear test? The test starts by pushing the vane and the rod vertically into the soft soil. The vane is then rotated at a slow rate of 6° to 12° per minute. The torque is measured at regular time intervals and the test continues until a maximum torque is reached and the vane rotates rapidly for several revolutions. 3. Why is direct shear testing important? Direct shear test is simple and faster to operate. As thinner specimens are used in shear box, they facilitate drainage of pore water from a saturated sample in less time. 4. What are the disadvantages of vane shear test? - Drawbacks of vane shear test are as follows: - Vane shear test is not suitable for clays which contain sand or silt laminations in it. - It cannot be conducted on the fissured clay. - If the failure envelope is not horizontal, vane shear test does not give accurate results.

5. How to obtained the undrained shear strength?...