The conventional sand compaction pile (SCP) method, which is a widely applied ground improvement method, aims to increase the bearing capacity of soft ground by reinforcing it as compacted ground, or by increaisng the denstiy of loose sandy ground. However, the use of a vibro-harmmer generates noise and vibration, which may adversely affect the surrounding environment. To reduce noise and vibration, the authors developed a "non-vibratory SCP method", that is based on a rotary pentration system that uses a forced lifting/driving device and a rotary drive motor. And as an antoher new SCP method, "SCP with excavated soil method", in which the excavated soil will be recycled as the material of the pile instead of sand, has developed in recent years. Because it has been increasingly difficult to obtain highly permeable materials required for the SCP method and sand drain (SD) method. This paper sets out the development objectives and development history of above two methods, which are both applicable for environmental point of view.
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