DEFORMATION MONITORING

               

A THESIS BY LACHLAN YOUNG

SUPERVISED BY BRUCE HARVEY

OCTOBER 2008

Conventional deformation monitoring is the study of an objects displacement relative to time and space (Welsch & Heunecke, 2001). Typical objects whose movements are of interest to us include (Caspary, 2000):

- tectonic plates

- steep load bearing walls

- ground subsidence

- manmade structures e.g. buildings, dams, bridges

Deformation monitoring is the main safety guard many of these objects have against failure or collapse. As continual monitoring can identify any abnormal or risky structural behaviour undergone by the object. So there is an increased necessity for the application of deformation techniques to monitor these objects. Over resent years deformation monitoring has become increasingly interdisciplinary as studies of an objects movement can help pinpoint other physical activities, such as internal or external loads that may be causing the deformation (Welsch & Heunecke, 2001). This has brought about new analysis techniques that encompass not only consider deformation relative to time and space but also consider deformation as a dynamic process.

Table 1.1 shows the different types of deformation modelling and how they relate to time and acting forces. This thesis will focus on congruent and kinematic models of deformation and how data from these models is processed and analysed.

Table 1.1. Classification of deformation models (Heunecke & Welsch, 2001).