INTERPRETATION OF TUNNEL INSTRUMENTATION DATA

The paper highlights the importance of field instrumentation of underground structures and focuses on interpretation of instrumentation data which is one of the key elements of the instrumentation process. The role of instrumentation in support modification during tunnel construction and the importance of estimating tunnel convergence and support pressure that occurred before installation of the instruments have been explained with the help of rock mass-tunnel support interaction analysis. The usefulness of field instrumentation has been brought out with the help of case histories.