Abstract
In recent years, there has been an increasing acceptance of the use of multiple underream anchor systems for the support of both temporary and permanent structures. This acceptance has been facilitated by the development of construction techniques which allow convenient and economical installation of multiple underreams, and has been accompanied by the formulation of empirical rules for use in design. Some experimental research has been undertaken into the performance of multiple underream anchors (e.g. Swain, 1976) however there has been relatively little theoretical research into the factors influencing the behaviour of these anchors. In this paper, an analytical technique for calculating the elastic response of multiple underream anchors is outlined and is then used to investigate the effects of the number and spacing of underreams upon the behaviour of anchor systems resting in an elastic half-space. In this study, consideration is given to the influence of the anchor's proximity to the free surface and its inclination upon the elastic response.
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