Our MEMS Portable Tiltmeter System with Model ICTS0004 Micro-Electro-Mechanical System (MEMS) Portable Tiltmeter System permits the precise measurement of changes in tilt of engineering structure.
WATIMA using the Digital RST Portable MEMS Tilt Meter utilizes a MEMS tilt meter to measure tilt in two axial planes perpendicular the surface of the base plate. Lugeon did not specify the diameter of the borehole, which is usually assumed to be 76mm (N size), but the test is not very sensitive to change in borehole diameter unless the length of borehole under test is small. A rock is said to have a permeability of i lugeon if, under a head above ground water level of 100m,Ī 1m length of borehole accepts 1 litre of water per minute. The results of the test are usually expressed in term of Lugeon units. The test is used to assess the amount of grout that the rock will accept, to check the effectiveness of grouting, to obtain a measure of the amount ofįracturing of the rock (snow, 1968, or to give an approximate value of the permeability of the rock mass adjacent to the borehole. The flow is confined between two packers in the double packers test or between the packer and the bottom of the borehole in the single packer test. is confined between known depth by means of packers, hence the more general name of the test. It comprises the measurement of the volume of water that can escape from uncased section of borehole in a given time under a given pressure.
The test was originally introduced by lugeon (1933) to provide an acceptable standard for testing permeability of dam foundations. Packer or lugeon test gives a measure of the acceptance by insitu rock of water under pressure.
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