Elastmeter model - 3964B MARK - 2 OYO pressuremeter
OYO pressuremeter is used for measuring the elastic properties and stress state in rocks and hard soils. During measurement pressuremeter probe is inserted into a borehole of diameter from 76 to 90 mm, down to a depth of 300 m, where up to 20 MPa of pressure can be applied on the surrounding rock mass. The result of measurement with OYO pressuremeter, in rocks or soils, is stress - strain curve from which it is possible to obtain and assess some of the properties in-situ stress state. From the data curve, among other characteristics, it is possible to determine elastic modulus of rock, reload - unload elastic module, limit of plastic deformation, undrained shear strength, shear modulus and limit pressure.