When designing blast-filled dams it is necessary to predict the quality of the fill. The main indices by means of which the quality of the dam is checked are the particle-size distribution and density of the fill material, since the prospects of constructing blastfilled dams are relatedprimarily with the construction of homogeneous dams of a flattened profile, when a decrease of seepage flow is achieved by reducing the gradients of the head. At present the main indices are predicted on the wholeby conducting on-site experimental explosions. Sufficiently reliable data can be obtained only by conducting a relatively largescale explosion forming a high embankment of large volume. Such experimental explosions are expensive and labor-intensive. Therefore it is necessary to develop a mechanical-mathematical model of the phenomenon, on the basis of which the properties of the fill material and physical and mechanical properties of the dam as a structure can be predicted.The physical and mechanical properties of the soil of blast-filled dams are determined by the process of constructing the dam. The process of constructing a dam by a directed explosion consists of two stages: fracturing of the rock mass and dynamic compaction of the rock obtained when it falls to the ground. The physical and mechanical phenomena occurring in each stage are so complex and poorly studied that at present there are practicallyno analytic methods of solving various specific problems which would make it possible to obtain sufficiently reliable results. The basic theoretical considerations about the first stage are given in [5,8]. Empirical methods have been created which to some extent permit predicting the size distribution of the soil after the first stage [3]. Theoretical and experimental investigations showed that fracturing of jointed rocks occurs mainly along natural joints [3,5]. This means that on the basis of the results of measuring rock joints it is possible to predict the size distribution of soil after the first stage [12,13]. The present article is limited to investigations of the second stage --the stage of formation of the dam.Stresses during Formation of the Fill. The size distribution and density of the soil of the dam are predicted on the basis of calculating the stresses occurring during formation of the dam. By creating such stresses in a specimen of soil having a size distribution analogous to that being predicted on the basis of jointing (before blasting), we obtain the size distribution of the dam's soil after formation of the fill.
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