UDEC英文说明.pdf

Sliding Block between Two Slightly Skewed Rigid Walls 2 - 1 2 Sliding Block between Two Slightly Skewed Rigid Walls 2.1 Problem Statement This problem involves the sliding of an elastic block between two near parallel walls (see Figure 2.1) and is derived from a similar problem in Wart et al. (1984)*. A pressure is applied to one edge of the block such that the block moves, the initial gap is closed, and the normal stress on the contact faces between the block and the walls increases. The increased normal stress causes an increase in the shear resistance through friction on the surface and the block stops. The problem involves computation of the block displacement parallel to the direction of applied pressure. Y a δ o y=(b/2)-mx P b c X δ y=-(b/2)+mx o Figure 2.1 Sliding block between two slightly skewed rigid walls The objective of this problem is to demonstrate: (a) the computation of correct stresses and displacements for a problem involving nonlinear geometry and constitutive relations; and (b) the ability of UDEC to handle relatively large displacements. * This section was prepared for the U.S. Nuclear Regulatory Commission under U.S. NRC Contract No. 02-85-002.