Dynamic Response of a Horizontally Buried Cylinder above a Soil/Rock Interface Results of a Finite-Element Analysis.

摘要

Static and dynamic two-dimensional finite element computer structural analyses were performed on cylinders, horizontally buried above a rigid concrete bottom (simulating a soil/rock interface), for correlation with laboratory experimental test data. Both linear and nonlinear constitutive models were used to mathematically describe the behavior of the soil medium. A mesh parameter study was performed to optimize mesh size and time increment without degradation of the results. The computer results compared favorably with the experimental data. The reflection of a dynamically applied surface load from the rigid bottom caused soil stress increases of more than twice the incident stress level. These increases were transmitted directly to the cylinder in the form of increased thrusts and moments. (Author)