Abstract
The results of complex geotechnical studies aimed at creating a temporary soil dam for the reconstruction of the main gas pipeline are conducted. Based on the study of the properties of the three types of soils that are in the vicinity, the technical-economical efficiency and prediction of the compaction of the recommended soil are substantiated. The choice of soil laid in the dam should be carried out on the basis of the study of the properties of soils and feasibility study. Technical-economical assessment is impossible without knowledge of the characteristics of the soil, which were obtained in laboratory conditions. Three series of experiments were performed for this: determination of soil density; determination of the angle of repose; determination of soil filtration coefficient. The parameters were investigated in the course of the experiments, on which the quality of the soil dam depends to the greatest extent: density; angle of repose during dumping; filtration properties (filtration coefficient). Based on an analysis of the current situation, proceeding on environmental requirements and considerations of economic feasibility, it was proposed to fill in a temporary embankment to allow the piles to be loaded by driving, and to make it out of medium-sized sand composing the surface thickness in a given area. On the assumption of the technological requirements of the reconstruction, the dam should be 5 m high and 36 m high on the top and 51 m high on the bottom. Based on experimental-analytical researches, a motivated choice of soil is substantiated, which made it possible to obtain an economic effect confirmed by the act.