关键词: 桩网结构路基, 土拱效应, 土工格栅, 静动荷载

Abstract: The pile-soil stress and grid tensile force of each part of the geogrid reinforced pile supported embankment were detected through laboratory model tests under both dynamic and static loads, and the development and evolution mechanism of soil arching effect and the development characteristics of geogrid stretching effect were studied. The test results show that the distributions of pile-soil stress and grid tension are greater in the transverse direction of the subgrade than that in longitudinal extension direction, which is related to the design of the trapezoidal section of the subgrade; the spatial soil arching effect is stronger than the planar soil arching effect, and the limit state of the spatial soil arching effect when the pile-soil stress ratio is 3.8, the limit state of the plane soil arching effect appears when the pile-soil stress ratio is 2.2; the soil arching effect under dynamic load has a certain extent attenuation comapated with under static load, position with stronger soil arching effect under static load has a greater attenuation degree under dynamic load, the development trend of the soil pressure between the piles with the vibration frequency is similar to the N-type, which is exactly the opposite of the change trend of the soil pressure on the top of the pile.

Key words: geogrid reinforced pile supported embankment, soil arching effect, geogrid, static and dynamic loads