Technical Support

Inclinometry represents the most common method used to verify slope stability. Through this method, one may establish size, ratio, direction, depth and type of landslides. These data are vital to understand causes, development mechanism and selection of the optimal solution for addressing this issue, but also to verify the sustainable efficiency of such solution.

The method is based on measuring the deviation of boreholes from vertical by using an inclinometric probe, within certain intervals of fixed readings. The probe travels the length of the boreholes through special corrugated tubing. The inclinometer measures the deformations on perpendicular direction to the main axis of the tubing, i.e. the horizontal underground deformations, which will correspond to the land sliding plan.

The methodology includes installation of tubes and mounting them by using special cement, tailored to meet the onsite conditions or, as the case may be, with coarse backfilling material. The base of the tubing is placed in stable ground for at least 3m to 5m. This measure is taken to allow characterization of landslide at absolute values.

Geo Search uses a biaxial probe manufactured by Geokon, and RST equipped with MEMS sensors, at 0.025 mm/0.5 m resolution and a 3 mm/ 30 m total precision.

The method consists in measuring the ground water pressure and the variation of the free water level in time. There are several types of piezometers, and they can be classified depending on their response to the variation of underground water pressure. In practice, open piezometers (corrugated tube, Casagrande type) are the most commonly used but have a slow response to pressure variations, and the piezometer probes with vibrating wire having a rapid response to pressure changes. In order to monitor slope stability on a longer term, the aim is to establish the ground water pressure throughout an extended period, and that is why the Casagrande piezometers are the most adequate ones in different situations. Under special circumstances, the placement of rapid response monitoring systems may be justified (as it is the case of backfilling within low consistency soils).

Geo Search provides services for the development of monitoring (both Casagrande, and vibrating wire), maintenance thereof and assessment of secured data.

The principle of this method is based on measuring impedance variations of electric cables placed within boreholes. The variations are due to anomalies affecting the cables, and among these, the most common one is the shearing event resulting from movement of lands. Thus, the system consists of a coaxial cable and a generator of impulses – measurement instrument. The cable may be placed both vertically as well as horizontally.

This method presents several advantages as compared to the classical methods, especially the advantage of low installation and operation costs. It may be connected to automatic monitoring and warning systems in place in case of landslides.

Monitoring the use of a building is a periodic action developed to verify, survey, and investigate the way in which such building responds (reacts) while being used, under the impact of environmental factors, operating conditions, together with the interaction of such building with the surrounding environment.

Geo Search provides topographic survey services using geodesic methods, amongst which:

The tri-dimensional movements or deformations of buildings and lands may be measured by using geodesic methods, as follows: classical methods (total stations), GNSS methods (global positioning systems: GPS, GLONASS, Galileo, Beidu) or combined methods.