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Pressure - Meter Testing |
| To date, the pressure-meter test has evolved as part of an international standard procedure to give design parameters directly from within the borehole. The Elasto-meter is the sonde to be used for the borehole lateral load test. Through its use, the measurement can widely be extended covering soft soil layers with comparatively large displacement to the hard soil layers as well as the soft rock, both with small displacement. The caliper-type sensor housed in the sonde makes it feasible to detect the load pressure of the Elasto-meter and the deformation of the borehole diameter. Pressure meter test is mainly intended to measure in situ rock deformability around a borehole drilled in rock masses by applying hydrostatic pressure to the borehole wall. Pressure meter test is a method to investigate rock properties and / or rock conditions based on the relation between cavity pressure and radial displacement of borehole obtained from the loading hydrostatic pressure to the borehole wall with a cylindrical rubber membrane (i.e. measure in situ rock deformability around a borehole drilled in rock masses by applying hydrostatic pressure to the borehole wall). Other than rock deformability, there are some cases where rock properties such as rock strength, bearing capacity, etc. and / or rock conditions, such as rock stress, are estimated. |
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