Figure borrowed from: http://www.deir.qld.gov.au/workplace/law/codes/construction/tiltup/deadman/index.htm
Temporary bracing is used to support the concrete panels before they are incorporation into the final structure. Each panel should be supported with at least two braces and braces should be positioned so that they are uniformly loaded. Deadman pads are commonly used to anchor braces and stabalise panels to prevent them from falling over due to wind loads or other factors. The deadman concrete pads allow mass to create an effective temporary anchoring system for the tilt-up panels. The sites soil type and panel size will determine the individual pad sizes. In this case the sites clay soil is much more beneficial then a sandier site. Stiffer soils provide greater degrees of cohesion and is better in resisting pull out loads.