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Increase of operational safety and reliability is the most important task in the construction of port hydraulic structures. Sandy grounds are widely used to form new and expand existing areas of port hydraulic structures, including sandy backfill of city and port embankments. Liquefaction of water-saturated sandy grounds of bases is the most dangerous phenomenon for structures and buildings under technogenic dynamic impacts and earthquakes. In this connection abroad particularly in the United States and Japan is underway extensive research on the subject. The most effective way to improve the technogenic dynamic impacts and seismic safety of liquefaction soil bases and facilities is their seal. For this there are various methods of dynamic seal. However currently the use of these methods in the global construction practice is based on the developments of Russian specialists 50 ... 60-ies years of last century.Increasing the operational safety and reliability of port hydraulic structures to the liquefaction of sandy soils can be ensured by their compaction. The author of the report shows the high efficiency of the explosive method for sealing water-saturated sandy soils bases designed them a new way of consecutive blasting charges. In addition, a method consecutive blasting charges and proposed them a new method vibration isolation soil bases of construction site allows several times to reduce the magnitude of the dynamic effects on nearby buildings and weak indigenous soils. The carried out researches have shown that the method of consecutive blasting of charges allows to increase the relative sediments of the compaction base by 30 – 40 % and to reach the degree of soil base density ID not less than 0,6 – 0,8, which practically ensures the stability of sandy ground structure to their liquefaction in the base of buildings and structures from technogenic vibrodynamic and seismic influences. In addition, the use of the method of sequential charge blasting to compact the base soils allows a reduction of 2, 5 – 3 times the safety distances for buildings and structures. Moreover, the additional creation of a special protection in the form of a layer of aerated soil along the boundary of the base to be compacted makes it possible to almost completely eliminate the danger of technogenic vibrodynamic effects arising from the dynamic compaction of the grounds of new construction bases to nearby buildings and structures. This allows us to expand the scope of the dynamic methods of compaction of sandy water-saturated soils for the conditions of expansion of existing port hydrotechnical complexes and the presence of weak clay soils with structural strength at their base.

vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s. o. makarova/vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s.o. makarova

IMPROVEMENT OF OPERATIONAL SAFETY AND RELIABILITY OF PORT HYDROTECHNICAL STRUCTURES TO THE LIQUEFACTION OF SOIL BASES BY A NEW EXPLOSIVE SEALING METHOD