抄録
Conventionally, steel sheet piles have been utilized as earth pressure resisting structures such as riverbank revetments, seawalls, road retaining walls and temporary retaining walls by taking advantage of their excellent horizontal resistance characteristics. In recent years, it is also applied to structures expected for vertical bearing capacity. The "closed-end steel sheet pile", which is expected to exhibit a higher vertical bearing capacity, has been developed by providing a processed and closed cross section of the front end portion of the steel sheet pile. In the Sheet Pile Foundation Method, it has been shown by previous studies that effective reinforcement of substructures can be achieved by using this processed “closed-end steel sheet pile”. However, the bearing capacity characteristics when the “closed-end steel sheet pile” is supported on the intermediate layer is unknown. Therefore, in order to grasp the bearing capacity characteristics when the “closed-end steel sheet pile” was supported on the intermediate layer with SPT N value of about 30, the full-scale load test was carried out. As a result, from the distribution of the axial force and the peripheral resistance, the resistance of the pile-end closed-section zone is sufficiently demonstrated, and it is estimated that the plug of the pile-end closed-section contributes greatly to the bearing capacity development.
