A REAL SCALE EXPERIMENTAL STUDY ON DYNAMIC SOIL SPRING CHARACTERISTICS IN AXIAL DIRECTION FOR BURIED PIPELINE

Abstract

To investigate the dynamic soil spring characteristics in axial direction of the buried pipeline by the real scale experiment, the high velocity loading system was developed and the buried pipe of 600mm in diameter and 180cm in depth to the top, was loaded. The conclusions are as follows; 1) the slippage occurs between the pipe and the soil when the shear stress between them reaches the critical value, 2) the soil spring stiffness and the critical shear stress increases as the loading velocity increases, 3) the critical shear stress in high velocity, is the largest in the virgin loading, and it decreases 40%-50% in the second loading.