Investigatio of behavior of caisson-type pile foundation subjected cyclic lateral load in sand.

• Main Authors: Yu-Wen Hui, 游文輝
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/04987621327209675914

碩士 === 國立中央大學 === 土木工程研究所 === 90 === When free way is constructed in the mountain area, the foundation of bridge will be inevitably erected in the slope and one of most frequently used foundation is the caisson-type pile foundation. In addition to supporting the gravity load transmitted from the bridge structure, the caisson-type pile foundation will be subjected to lateral load induced by wind, earthquake and so on. Therefore, it is important that the behavior of caisson-type foundation under the action of lateral load be investigated. In this study, the behavior of caisson-type pile foundation subjected cyclic lateral load is investigated using the geotechnical centrifuge. The distribution of bending moment along the shaft of caisson-type pile is obtain by using the modified polynomial approach and the measured values, which can then be used to find the soil reaction by differentiating twice and the deflection by integrating twice. The results show that the purposed test procedure has a very good repeatability. As the number of cycles increases, the increment of bending moment decreases and the lateral load will approach a constant value, while the pile-head displacement increases. For caisson-type pile embedded in a low-density sandy soil stratum, the decrease in moment will be smaller and the residual moment will be larger, as compared with that embedded in high-density sandy soil stratum.