Centrifugal and Numerical Modeling of Buried Structures. Volume 2. Dynamic Soil-Structure Interaction

摘要

Soil-Structure interaction under blast loading was investigated both experimentally in 10 g-ton centrifuge and analytically by finite element simulation. In the centrifuge experiments, circular pipes made of micro-concrete were buried in a dry sand and tested in the centrifuge to simulate the effects of gravity-induced overburden stresses which played a major role in controlling the soil stiffness and, subsequently, the response of the pipe. The blast loading was simulated by a pressure pulse generated by rupturing a burst disc in an impact generator. Surface stress gages and contact stress gages both made of polyvinylidene fluoride were built and calibrated to measure air blast magnitudes and contact pressures. The centrifuge experiments provided insight into the dynamic response of buried pipes and a data base for the verification of numerical results. These results were obtained by linear and non-linear finite element analyses of the experiments duplicating the surface overpressure loading. The suitability of constitutive relations for both soil and micro-concrete were verified by comparing test results and analysis. The effects of soil arching around the buried pipe was also delineated from both experiment and analysis.