INFLUENCE OF IMPACT FREQUENCY AND FEED FORCE ON THE RATE OF ROD PENETRATION INTO THE SOIL MASS
I. V. Tishchenko
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Pneumatic hammer, striker, impact frequency, shock pulse energy, rod element, static load, soil resistance, sinking rate
Abstract
The laboratory model of a pneumatic hammer with a striker weight of 4 kg and stepwise control of the impact power due to its frequency component is created. Its actual energy characteristics depending on adjustment option are presented. In the experiment, the rod experienced a combined action in the form of periodic shock pulses with an additional static load. Empirical graphical and calculated dependences of the influence of impact frequency and the magnitude of external force on the rate of casing penetration into the soil mass are obtained, provided that the necessary threshold value of pneumatic hammer energy required to overcome the soil resistance is reached.
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