Browsing by Subject "dynamic replacement"

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Access status: Open Access ,
Wpływ energii formowania na kształt kolumn wykonywanych metodą wymiany dynamicznej
(Wydawnictwa AGH, 2011) Kanty, Piotr; Kwiecień, Sławomir
Driven stone columns formed with the use of dynamic replacement method is one of many geoengineering methods, widely used to strengthen the cohesive and/or organic soils under the linear and cubature objects. It is based on ramming of the aggregate into weak soil using drops of high energy in the specified grid of points. Despite apparent simplicity, the method may pose some problems in practice. They may be caused by inadequate choice of the drop energy during the soil reinforcement which influences the diameter and the length of the columns. In extreme cases the columns may be too short or there may appear a total soil replacement. For these reasons the authors of the paper decided to carry out a series of laboratory tests which aimed at determining the influence of the drop energy on the shape of the columns. The research was carried out on the test stand that allowed the observation of the formation process of a rammed column. Its dimensions were adjusted so as to reflect the real dimensions in scale 1:10. In order to carry out the observations of the processes intervening during the rammed column formation the experiments were filmed and photographed. Three following variations of reinforcement were analysed: by using a relatively constant but low (column z. 2), constant and maximal in the carried research (column z. 3) and gradually increasing (column z. 1) energy. The obtained columns differed in shape. The whole is preceded by a short information about the dynamic replacement method.