STUDY OF CALCULATION METHOD FOR THE GROUND STIFFNESS USING THE ACCELERATION MEASUREMENT OF VIBRATORY ROLLER

摘要

Advances in GNSS and TS systems have led to the introduction of a compaction construction management method using the traveling track of a roller compactor in compaction of embankments such as roads and airports. However, if it is possible to evaluate the stiffness of the ground in real time, it will also be possible to directly control the quality of the embankment. In this paper we want to show the new method to grasp the relationship between subgrade reaction and vibratory roller displacement from the acceleration values measured by acceleration sensors attached on the roller and frame of vibratory roller. To verify this calculation method, the field experiment for three kinds or types of ground of silty sand, containing gravel soil and grain-size-regulated fine sand, was conducted. The density of the compacted ground after the 1, 4 and 8 roller passes was measured by the radioactive isotope sensor and the soil stiffness was measured by small Falling Weight Deflect meter (FWD). From the comparison with the stiffness of the compacted ground measured by FWD and the calculation value from the acceleration of roller and frame, it was indicated that the calculation value through this method was reasonable as the compacted results by the vibratory roller.