02292naa a2200265 a 450000100080000000500110000800800410001910000170006024500620007726000090013930000140014852015200016265000090168265000090169165300120170065300130171265300110172565300250173665300240176165300230178570000170180870000170182570000180184277301660186010270481999-12-22       1996    bl ---       0--  u    #d1 aNAIME, J. M.  aPortable CAT scanner applied to collapsible soil studies.  c1996  aRef.PB11.  aThe soil collapse is causing huge losses to the grain procedures of Mato Grosso State. As a result of this phenomenon many silos are showing signals of sinking. The soil collapse means a sudden reduction of soil volume, when submitted to a stress, due to a rise on its soil moisture. The collapse occurs when the soil is non-saturated and its structure is metastable. The temporary stability of the soil can be checked out through the matrix potential and natural cements. In this work, computerized tomography (CT) technique was applied to measure the reduction of voids caused by the soil collapse. The equipment is a portable tomograph developed at the Instrumentation Center of EMBRAPA/CNPDIA-Sao Carlos, SP. The analysis were carried out in soil samples collected after the execution of load tests which simulates the silo building, in conditions of natural humidity and saturated soil. The CT scanner has the following characteristics: it can be carried to the field and the scanning mechanism is bipartite. The equipment can do scannings of soil monoliths and trees. It is constituted of a gamma ray source (137Cs), semiconductor detector (CdTe), mechanical system and microprocessed electronic circuit. The obtained results show that the influence of the collapse extends to only a few centimeters under the sitting element level of silo's foundation. The results mean important data for soil testing related to building construction and also for characterization and modeling how collapsible the soils are.  asoil  aSolo  aColapso  aCollapse  aEstudo  aMato Grosso (estado)  aPortable CT scanner  aTomografo portatil1 aCRESTANA, S.1 aCONCIANI, W.1 aSOARES, M. M.  tIn: INTERNATIONAL CONFERENCE ON PHYSICS AND INDUSTRIAL DEVELOPMENT: BRIDGING THE GAP, 2., July 1996, Belo Horizonte, MG. Abstracts... Belo Horizonte: UFMG, 1996.