Главная страница
russian   english
16+
<< back

Title of Article

IMATHEMATICALLY MODELING NONSTATIONARY IMPACT AND PENETRATION PROCESSES AND THE IDENTIFICATION OF THE PROPERTIES OF SOFT SOILS


Issue
4
Date
2011

Article type
scientific article
UDC
 
Pages
1377-1379
Keywords
 


Authors
Bazhenov V.G.
NII mekhaniki Nizhegorodskogo gosuniversiteta im. N.I. Lobachevskogo

Kotov V.L.
NII mekhaniki Nizhegorodskogo gosuniversiteta im. N.I. Lobachevskogo


Abstract
Based on the combination of physically and mathematically modeling the processes of impact and penetration of cylindrical rods, a computational-experimental method for identifying deformational and strength properties of soil media in a wide range of pressure changes has been developed. A formulation of the problem and a methodology are presented for analyzing the impact interaction forces of bodies of revolution for their oblique penetration into soft soils, based on the plane cross-section hypothesis. Neglecting the mass and pulse flows in the circumferential direction, the solution of a 3D problem reduces to the joint solution of a set of 2D axisymmetric problems for each meridian cross-section. The results of numerically analyzing the problem of oblique penetration of a rigid spherical body into a soil obtained using the above method are compared with the solutions for a full 3D formulation and for the model of local interaction using 1D solutions of a widening spherical cavity in compressible and incompressible media. It is shown that, as compared with the already available local interaction models, the present approach will make it possible to considerably increase the accuracy of estimating the resistance forces and trajectories of the bodies by accounting for the dynamics of the free surface and cavitation effects of detached flow, especially at the initial stage of penetration at an angle to the free surface, when a deflection of the trajectory of the striker from its initial direction is formed, and the use of the incompressibility hypothesis reaches its maximum.

File (in Russian)