1. DESCRIPTION
The M-1000 (NILCON) shear vane tester is a measuring device used to estimate in situ the shear strength of
cohesive soils. Test results are recorded on a waxed paper disk to form a permanent record.
The recording head is mounted on either a casing or a hollow auger using an adapter, and the vane is pushed
at the bottom of the borehole, or it is mounted on a portable boring rig used for pushing the rods into the ground.
The test can be performed at various depths.
General arrangement of the M-1000
1.1 Vanes
The vane consists of four orthogonal blades secured to a central shaft. Three sizes of vanes are available: 5 x
11 cm, 6.5 x 13 cm, and 8 x 17.2 cm.
A 10 x 20 cm vane is sometimes used in very soft ground. The standard vanes are Type 3, i.e. they are fitted
with a conical point at the bottom.
Smaller vanes are only used if the maximum strength of the ground cannot be attained with the recommended
sizes.
Always check and clean the vanes before use. No defects (such as gouges, breakages, distortion or rust holes)
are acceptable, since they can affect the results.
1.2 Slip Coupling
The slip coupling is installed right above the vane and enables the rods to rotate by 15 degrees without the
vane rotating. Periodically check that slip coupling can rotate 15 degrees without any abnormal resistance. Be
sure to also frequently check the condition of the rubber protector on the coupling. Replace the rubber protector
if it becomes damaged.
To Next Page