Abstract
At drilling of offshore drilling rig chinks by hydromonitor chisels as a result of dynamic interaction of a stream of a liquid with rock in the conditions of a chink face there is its hydromonitor destruction. At the moment of blow the liquid is compressed in the beginning and only then starts to spread. It is known that, in mining, the occurrence of hydromechanical pressure under the influence of high jet pressure, flowing from the bits of the bit, is inherently pulsating during drilling with the offshore drilling rig. Consequently, in the array where the mountain pressure acts, there is a sign-alternating stress, as a result of which the fatigue of the people.
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