Dataset comprises the results of a study into the engineering geological characteristics of tropical red clay soils, funded by the Overseas Development Administration. The geotechnical properties of a wide variety of red clay soils were determined by means of standard, specialised and new test procedures on both disturbed and undisturbed samples. These were obtained from selected study sites in a range of contrasting climatic, topographic and geological terrains, at various depths in weathering profiles. The majority of the study was undertaken in Kenya and Indonesia, in collaboration with local counterpart organisations (Ministry of Public Works, Materials Testing and Research Department, Nairobi; Institute of Road Engineering, Bandung). Study also included sample sites in Fiji and Dominica. The dataset includes detailed description sheets for the sampling sites, together with the laboratory programme of index and mechanical properties tests, much of which is held in digital format. All data from the study is available.

This dataset provides an assessment of the potential for a geological deposit to shrink and swell. Many soils contain clay minerals that absorb water when wet (making them swell), and lose water as they dry (making them shrink). This shrink-swell behaviour is controlled by the type and amount of clay in the soil, and by seasonal changes in the soil moisture content (related to rainfall and local drainage). The rock formations most susceptible to shrink-swell behaviour are found mainly in the south-east of Britain. Clay rocks elsewhere in the country are older and have been hardened by burial deep in the earth and are less able to absorb water. The BGS has carried out detailed geotechnical and mineralogical investigations into rock types known to shrink, and are modelling their properties across the near surface. This research underpins guidance contained in the national GeoSure dataset, and is the basis for our responses to local authorities, companies and members of the public who require specific information on the hazard in their areas. The BGS is undertaking a wide-ranging research programme to investigate this phenomenon by identifying those areas most at risk and developing sustainable management solutions. Complete Great Britain national coverage is available. The storage formats of the data are ESRI Shapefiles and MapInfo but other formats can be supplied. The GeoSure data sets and reports from the British Geological Survey provide information about potential ground movement or subsidence in a helpful and user-friendly format. The reports can help inform planning decisions and indicate causes of subsidence. The methodology is based on BGS DiGMap (Digital Map) and expert knowledge of the behaviour of the formations so defined.