Geotechnical Instrumentation
The engineering practice of geotechnical instrumentation involves a strong bondage between
the capabilities of measuring instruments and the capabilities of engineers. There are two
general categories of measuring instruments. First category is to use in situ, to determine
the soil and rock properties i.e. permeability, compressibility and strength etc during design
phase of the project. The second category is to monitor the performance, normally during
construction phase of the project that may involve groundwater pressure measurement,
stresses, deformation, load or strain etc. For major projects, an automatic data acquisition
system helps in Real-Time Monitoring, Alert System and making the right decision which has
impact on site safety.
We are equally experienced in designing instrumentation at designing stage and monitoring
performance during construction phase. Our team is capable in the following type of
geotechnical instrumentation.
Vibratory Wire Piezometers/Standpipe Piezometers
Settlement Cells
Slope Inclinometers (SI)
In-Place Inclinometers (IPI)
Shape Accel Array (SAA)
Vibratory Wire Piezometers/Standpipe Piezometers: Piezometers are used to monitor the
pore water pressures, which help engineers to determine initial site conditions, monitoring the
effectiveness of drainage systems, determining safe rates for fill placement and ensuring slope
stability etc. Multi level VW Piezometers can be used in series to monitor pore pressure at
multiple zones or soil strata. VW Piezometers can be attached to the data logger and may be
monitored remotely.
Settlement Cells: By using settlement cells, we can measure the vertical deformation in soil.
This helps engineer to verify soil consolidation as plan, to correct or verify the rate of foundation
loading, to verify the performance of engineering design and to determine the need and timing
for corrective measures etc. Multi level settlement cells may be used to find the settlement
among different zones or soil strata. Settlement Cells can be attached to the data logger and
may be monitored remotely.
Slope Inclinometers: Slope inclinometers are used to monitor the lateral/subsurface
deformations. This helps engineers to evaluate the stability of slopes/embankments, also
performance and safety of structures can be verified. A special purpose, grooved pipe
is installed in the borehole that passes through suspected zones of movement. Slope
inclinometers are installed at toe/accessible places to get the manual readings.
In-Place Inclinometers: The mechanism of Slope Inclinometers and In-Place Inclinometers is
same except that In-Place Inclinometer systems are used when continues monitoring is required
for construction or safety. The system may consist of one or more dedicated sensors connected
to data logger, hence can be monitored remotely.
Shape Accel Array (SAA): SAA is consisting of tri-axial MEMS (micro-electro-mechanical
systems) gravity sensors. It can be used vertically to track magnitude and direction of lateral
deformation and horizontally to track vertical deformation or settlement.
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