Conclusions
-
1.
For the example of sinusoidal pulses applied to the end of a pipe, we have shown that a pulse with the greatest amplitude at fixed shock energy will drive the pipe furthest into the ground.
-
2.
Other conditions being equal, the greatest distance to which the pipe is driven in the ground is directly proportional to the amplitude of the initial pulse applied to the end of the pipe.
-
3.
The residual strain (stress) in the pipe due to the presence of external friction increases with the length of the shock pulse.
-
4.
The damping of the shock-pulse amplitude is linear, regardless of the elastic properties of the ground, as long as individual sections of the pipe slip relative to the ground. The damping coefficient is directly proportional to the frictional coefficient of the pipe in the ground and does not depend on the shock-pulse configuration.
-
5.
Analysis shows that the distance to which the pipe is driven in the ground may be increased by a factor of more than 1.5, at constant shock energy, by eliminating the intermediate mass from the model of the shock-pulse generator; in practice, the intermediate mass corresponds to the housing of the shock machine rigidly connected to the anvil.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M. G. Tseitlin, V. V. Verstov, and G. G. Azbel, Vibrational Technologies in Pile Driving and Drilling [in Russian], Stroiizdat, Leningrad (1987).
L. V. Nikitin, “Dynamics of elastic rods with external dry friction,” Usp. Mekh.,11, No. 4 (1988).
I. M. Mirzaev, “Dynamics of prestressed rod under shock loading,” in: Continuum Dynamics [in Russian], Novosibirsk, No. 71 (1985).
I. M. Mirzaev, A. L. Smirnov, and M. V. Stepanenko, “Numerical modeling of wave processes in composite rod systems in the presence of viscous and dry friction forces,” in: Proceedings of an international Scientific Conference on Friction, Wear, and Lubricants [in Russian], FAN, Tashkent (1985).
A. L. Smirnov, “Shock-type pile driving,” Fiz.-Tekh. Probl. Razrab. Polezn. Iskop., No. 4 (1989).
V. N. Beloborodov, A. L. Isakov, V. D. Plavskikh, and V. V. Shmelev, “Modeling shock-pulse generation in driving metal pipes into the ground,” Fiz.-Tekh. Probl. Razrab. Polezn. Iskop., No. 6 (1997).
O. D. Alimov, V. K. Manzhosov, and V. É. Erem'yants, Shock: Propagation of Strain Waves in Shock Systems [in Russian], Nauka, Moscow (1985).
A. I. Isakov and V. V. Shmelev, “Effective shock-pulse transmission in driving metal pipes into the ground,” Fiz.-Tekh. Probl. Razrab. Polezn. Iskop., No. 1 (1998).
Additional information
Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 48–58, March–April, 1998.
Rights and permissions
About this article
Cite this article
Isakov, A.L., Shmelev, V.V. Wave processes when driving metal pipes into the ground using shock-pulse generators. J Min Sci 34, 139–147 (1998). https://doi.org/10.1007/BF02803446
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02803446