Academy of State Fire Prevention Service, EMERCOM of Russia, Moscow, Russia
V. A. Sednev, Professor, Doctor of Engineering Sciences, Sednev70@yandex.ru
S. L. Kopnyshev, Senior Researcher, Associate Professor, Candidate of Engineering Sciences

Bauman Moscow State Technical University, Moscow, Russia

A. V. Sednev, Student

The use of the enormous energy contained in explosives is increasingly being used in various fields of human activities. Especially effective is the use of camouflet charges—buried explosives which produce the destructive effect without visible disturbances on ground surface. Despite the simplicity and accessibility of camouflet blasting, the issues of safety of such work are important. The camouflet explosion eliminates air shock waves and harmful effects of the explosion products on the environment, but leads to strong seismic vibrations. The blasting-induced seismic impact on nearby objects can initiate their load-bearing capacity loss, damage and destruction; therefore, when choosing locations for camouflet charges, it is required to assess PPV in enclosing medium during blasting, and to determine distances at which PPV are lower than the maximum allowable values set for the objects under consideration. The article presents the solution of a centrally symmetric problem on the particle velocity field in a continuous elastoplastic medium during camouflet explosion under the assumption of vibrationless motion and incompressibility of the medium in the plastic and elastic domains. The dependences are obtained for determining the dimensions of the expansion zones and the plastic deformation of the medium. The solution is based on the “camouflet equation” previously obtained by the authors—the relation to find pressure on the contact surface of an expanding spherical cavity due to internal pressure.

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