岩土力学Issue(1)：90-97,8.
强夯置换软土中碎石墩形成过程的试验研究
Experimental study of forming process of replacement pier in soft soil using dynamic replacement method
摘要
Abstract
In a dynamic replacement (DR) process, the length and the subsidence of the replacement pier need to meet the design specifications. The times of tampings and the fillings to fulfill a DR process is generally determined by field test. Understanding the forming mechanism of the replacement pier, and quantifying the factors such as energy releasing time, motion characteristics of fillers, stress of pounder bottom, etc, play critical roles for optimizing the DR process. In this paper, a model test method to study the interactions of the fillers and soil under the multiple impacts of the pounder is established. Experimental rusults show that each acceleration-time curve in DR can be divided into four stages, representing different phases of the soil-fillers motions under each pounding. Through analyzing the force-displacement (F-s) curves of the pounder in this process, the characteristics of each F-s curve are distinguished and the intrinsic mechanism is discussed. It was shown that with the increasing of filling times, the energy releasing time during each pounding decreases and the maximal force increases, signifying the gradual forming of the replacement pier in the soft soil foundation.关键词
强夯置换法/模型试验/置换墩/冲击动力学/加速度/高速摄影Key words
dynamic replacement method/model test/replacement pier/impact dynamics/acceleration/high speed photography分类
建筑与水利引用本文复制引用
郑凌逶,周风华..强夯置换软土中碎石墩形成过程的试验研究[J].岩土力学,2014,(1):90-97,8.基金项目
浙江省151人才工程资助项目(No. B01645104300)；宁波市“近海冲击与安全工程”创新团队项目(No.2009B21004)；宁波大学王宽诚幸福基金。 （No. B01645104300）
