Case Study of an Investigation of a Damaged House in Brisbane, Australia

摘要

The growth and removal of trees or pre-existing structures causes ground movements in reactive clay profiles by changing the clay moisture content. This paper presents results of a case study carried out on a house constructed partly on an old demolished house site, which has had tree removed prior to construction on one side and continued tree growth on the opposite side. The investigationprocess included a desk top research of the geology, aerial photos prior and post-construction, 4 drill holes with sampling, Atterberg, Shrink/Swell and moisture tests and floor level readings. The results show the amount of movement, which can occur once a well-watered garden is established over a previously drier soil profile. The Site Classification method by the original investigator (AS2870-1996) and the likely changes to the designing assumptions are discussed. Soil parameters and the effects of prior and remaining trees is determined and recommendations made to prevent or reduce further wall and floor movement.