METHOD FOR UNDERWATER STRUCTURE PROTECTION AGAINST PRESSURE CAUSED BY DRIFTING ICE FORMATIONS Russian patent published in 2007 - IPC E02B15/02 F42D7/00 

FIELD: hydraulic structure safety, particularly to prevent drifting ice formation impingement upon underwater structure.

SUBSTANCE: method involves breaking drifting ice formations into fragments having dimensions providing fragment immersion in water for depth less than admissible immersion depth for floating objects moving over underwater structure set from regulations. For single-stage drifting ice formation breakage well pattern is formed in ice. Then short-delayed well pattern blasting is carried out. Charge put in each well is selected to provide crack zone in ice extended up to lower border of drifting ice formation massif and to provide jointing of adjacent cracks generated during separate explosions. For that distance between wells along blasting chain line delay is to be equal to double depth of initial drifting ice formation immersion in water.

EFFECT: decreased labor inputs for underwater structure protection, decreased technical and ecological risks associated with ice action on underwater structure.

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