How is shear strength determined




















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View our Strength Testing Machines here Advertisement cookies to view the content. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. However you may visit "Cookie settings" to provide controlled consent, or click "Reject" if you wish to only use required cookies. Manage consent.

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The soil specimen may undergo either plastic failure or brittle failure in the UCC test, as shown in Fig. When a brittle failure of the soil specimen occurs, the proving ring dial gauge indicates a peak load, which decreases rapidly with further increase of strain. In brittle failure, a distinct failure plane in the form of a crack will occur across the specimen as shown in Fig. In plastic failure, no definite peak load is indicated and the soil specimen bulges laterally.

There will be no distinct failure plan and a number of small and fine cracks occur, distributed throughout the specimen. The test is essentially an undrained test, if it is assumed that no moisture content is lost from the soil specimen during the test. Thus, for saturated cohesive soils in UCC test.

The unconfined compressive strength is obtained by dividing the failure load with the cross-sectional area of the soil specimen at failure and it can be defined as —. The cross-sectional area of the soil specimen at failure is computed from —. The angle of failure plane may be directly measured as the slope of the major crack in the soil specimen with the base. The undrained cohesion may be then computed from —.

The laboratory vane shear test is used for the measurement of undrained shear strength of cohesive soils of low shear strength less than about 0. This test gives the undrained strength of the soil, and the undisturbed and remolded strengths obtained are also used for evaluating the sensitivity of the soil. It is a field test to determine the in situ undrained strength of soft clays, in which the bore hole shear device is inserted into the bore hole and expanded into the soil using compressed air.

The soil is sheared and the corresponding load P v is determined. The test device operates by applying the direct shear test principle in situ. The results from the bore hole shear test approximates a CU test. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Do not sell my personal information. Cookie Settings Accept. Manage consent.



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