The design and construction of any structure requires consideration and assessment of the ability of the ground to support the construction. Since the designer of geotechnical construction deals with naturally occurring heterogeneous materials and does not know their exact engineering properties, he may only carry out tests in the laboratory and try to determine the engineering properties on the samples picked up from the field. But his structural design is essentially based on the values of engineering properties of the materials tested by him. Therefore, as construction progresses and exact geotechnical conditions observed or behaviour monitored by means of instrumentation, the design judgments may be evaluated and changes made, if necessary. ThePaper presents Instrumentation as a tool to assist with these observations.
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