Effect of the Quantity and Degree of saturation of Fine grained DC Operations
Dynamic Compaction can be regarded theoretically similar to earthquakes, with regard to liquefaction and cyclic mobility trigger, and also blast, with regard to inducing a high amount of energy in a very small fraction of the time. But although there are some similarities, it is none of the above that makes the prediction and explanation of the phenomena difficult. It was found that three main factors as 1) quantity of fine grained portion and atterberg limits 2) the physico-chemical formation of the fine grained portion 3) degree of saturation governs the efficiency and predominant mechanism of the DC operations. A case history is discussed briefly and then some conclusions are presented. It was found the in granular soil with high percentage of fine grained portion based on the Atterberg limit and the water content of the soil two distinct outcomes may occur, as where before the borderline the DC gave satisfactory results, the results for the same soil with exactly identical tamping pattern were unacceptable and the tamping energy was completely dissipated and the soil column compaction in the exploitation zone was far below the required specifications
