SLOPE INDICATOR - INCREX MOBILE EXTENSOMETER

Application

The Increx settlement system from Interfels is used with inclinometer casing to obtain high-resolution measurements of ground deformation in the axis of the borehole. Typical applications include:

• Monitoring vertical and lateral deformations around underground openings.

• Monitoring settlements in the path of tunneling operations.

• Monitoring settlement and heave in the foundations of dams and power plants.

• Providing axial deformation data to complement inclinometer data.

The Increx system consists of a number of brass rings that are positioned at one-meter intervals along inclinometer casing, and a probe and readout that are used to measure the distance between successive rings. An Increx survey is typically started at the bottom of the casing. The probe is positioned to span the distance between the two deepest rings and a reading is taken. The probe is then raised about one meter so that it spans the distance between second and third deepest rings, and another reading is taken. This is repeated until readings have been taken for the entire casing.

The first survey establishes the distances between rings as installed. Subsequent surveys are compared to the initial survey to reveal changes in the distance between rings. If the distance has increased, extension has occurred; and if the distance has decreased, compression has occurred. Movements may be referenced to the deepest ring if it is located in stable ground or to the reference stand, which can be optically surveyed.

High Resolution and Accuracy: The Increx system can measure changes as small as 0.001 mm with an accuracy of plus or minus 0.01 mm per meter.

Omni-Directional: The Increx probe can operate in any orientation, from vertical to horizontal.

Efficient Use of Casing: The Increx operates in inclinometer casing.

Graphic Display of Data: Accessory software for PCs process data and provides a graph of settlements