Inclinometer systems are used to monitor deformation. The system includes an inclinometer casing, an inclinometer probe and a control cable, and an inclinometer readout unit.
The plastic inclinometer casing, as shown in Figure 53, is typically installed in a near-vertical borehole that passes through a zone of suspected movement. The bottom of the casing is anchored in stable ground. The inclinometer probe is used to survey the casing and establish its initial profile. The inclinometer probe consists of two servo accelerometers housed in a stainless steel body, a connector for the control cable, and two pivoting wheel assemblies.
Inclinometer systems are used for the
measurement of lateral earth
movements which can occur in the following:
They are also used to measure deflections
in the walls of excavations, shafts, tunnels
and in caissons, piles and sheet piling.
Casings can be installed either in a grouted borehole or, where ground conditions permit, pushed into position using CPT equipment. The annular space
between the casing and the borehole is backfilled to the surface with a bentonite cement grout specifically designed to match the surrounding soil conditions. Where the push-in method is used there is usually no need to backfill around the casing with bentonite cement grout.
The inclinometer casing is installed so that one set of grooves is aligned with the expected direction of movement and the base is securely fixed into position well beyond the expected zone of movement.
Ground movement causes the casing to move away from its initial position. The rate, depth, and magnitude of this movement is calculated by comparing data from the initial readings to data from subsequent readings.
In a standard inclinometer survey, the probe is drawn from the bottom to the top of the casing twice. The inclinometer probe employs two force balanced servo-accelerometers to measure tilt. One accelerometer measures tilt in the plane of the inclinometer wheels while the other accelerometer measures tilt in the plane that is
perpendicular to the wheels.
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