AXIAL BEARING CAPACITY OF THE EXPANDER BODY PILE
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概要
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A new type of pile, the expander body pile, is described in the paper. This new pile can be used for underpinning of structures which have been damaged, for example, by excessive settlements. The pile consists in principle of a folded steel sheet, the expander body, which is wrapped around the lower part of a steel pipe pile. The expander body can be inflated after the pile has been driven into the ground through the injection of cement grout. The bearing capacity of the pile is then increased partly throught the increased area of the base of the pile and partly through the compaction of the soil around the pile.The ultimate bearing capacity of the new pile can be estimated from either the maximum grout pressure required for the inflation of the expander body or from the results of different penetration tests such as cone penetration tests (CPT), standard penetration tests (SPT) and weight soundings (WST). The calculation methods which are based on the pressuremeter test have been used since the stress conditions at pressuremeter tests correspond closely to those at the inflation of the expander bodies. When results from penetration tests are used it has been assumed that the bearing capacity corresponds to the penetration resistance as determined by cone penetration tests (CPT) of the level of the expander bodies. Comparisons with test data indicate that the proposed design methods will give reasonable results. However, the measured bearing capacity for sand has been somewhat lower than predicted.
- 社団法人地盤工学会の論文
- 1985-06-15
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関連論文
- AXIAL BEARING CAPACITY OF THE EXPANDER BODY PILE
- Earth Pressures on Plies in a Row due to Lateral Soil Movements(松井保,洪元杓,伊藤富雄共著「土質工学会論文報告集」Vol.22,No.2,June1982掲載)