Centrifuge model loading tests on slope stabilizing micro-piles

摘要

Model tests on micro-piles subjected to a landslide were conducted in a 30G centrifugal acceleration field to evaluate the performance of the micro-piles in landslide prevention work. The landslide was simulated by applying lateral load to a compacted sand layer, which was placed above a layer of vinyl chloride simulating a soft rock. The tested pile was thin steel pile with an outer diameter of 9 mm and a wall thickness of 0.5 mm. Pairs of strain gauges were attached on its inner wall to measure bending moment and tensile stress of the pile. The model piles were used as (1) a vertical pile system, which consists of vertical micro-piles in a row, and (2) a vertical and batter pile group system, which consists of alternatively arranged vertical and inclined piles. Effects of pile structure including fixity of pile heads on the pile-soil interaction were studied. Two dimensional frame analyses of the piles were conducted to evaluate the load on the piles and the horizontal subgrade reaction of piles.