Question

You are required to write a `Critical Review` of the two In-Situ Tests written below on one Single-Sided WORD DOCUMENT (Not more than one page!):

A) Flat Dilatometer Test (DMT)

B) Field Vane Shear Test

Your `Critical Review` should possess two Sub-Titles (a) `Critical Assumptions related to these Tests`, and (b) `Advantages and Disadvantages of both Tests

Answer 1

(1) Flat dilatometer test :-

Critical assumption related to dilatometer test:-

(a). The penetration of a Dilatometer in clay can be evaluated through the cavity expansion theory.

(b). The lift-off pressure can be estimated from the ultimate pressure during the expansion of a cylindrical cavity.

Advantages and disadvantages of dilatometer test:-

● Advantages

a. rapid/inexpensive. b.Having semicontinuous profile. c.Does not required skilled operators. d. Can estimate horizontal stress and OCR.

● Disadvantages

a.Not applicable in gravel. b.Based on empirical correlation. c. No sample recovered.

(2) Field vane shear test:-

Critical assumptions related to field vane shear test:-

(a). Shear Strength in the Horizontal and Vertical directions are the same.
(b). At the peak value, Shear Strength is equally mobilized at the end surface as well as at the centre.
(c). The shear surface is having a shape of cylinder and has diameter equal to the diameter of the vane.

● Advantages and Disadvantages of vane shear test:-

Advantages:-

a. Vane shear test is easy and quick. b. This test can be performed either in laboratory or in the field. c. Ideal for finding undrained shear strength of non-fissured, fully saturated clay.

Disadvantages:-

a. Not suitable for clays which contain sand or silt. b. It cannot be conducted on the fissured clay. c. It does not give accurate results If failure envelope is not Horizontal.

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