Vane Shear Test ( VST)
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发布时间：2022-05-25 13:48
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时间：2023-11-02 22:43
The Swedish engineer John Olsson developed the vane shear test ( VST ) in the 1920s to test the sensitive Scandinavian marine clays in-situ ( Figure 6. 3 ) . The VST has grown in popularity，especially since the Second World War，and is nowused around the world.
Figure 6. 3 The vane shear Test
This test consists of inserting a metal vane into the soil，as shown in Figure 6. 3，and rotating it until the soil fails in shear. The undrained shear strength may be determined from the torque at failure，the vane dimensions，and other factors. The vane can be advanced to greater depths by simply pushing it deeper ( especially in softer soils) or the test can be performed belowthe bottom of a boring and repeated as the boring is advanced. However，because the vane must be thin to minimize soil disturbance，it is only strong enough to be used in soft to medium cohesive soils. The test is performed rapidly ( about 1 minute to failure) and therefore measures only the undrained strength.
The shear surface has a cylindrical shape， and the data analysis neglects any shear resistance along the top and bottom of this cylinder. Usually the vane height-to-diameter ratio is 2，which，when combined with the applied torque，proces the following theoretical formula:
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where suis undrained shear strength; Tfis torque at failure; d is diameter of vane.
