岩土力学2024，Vol.45Issue(1)：68-76,9.DOI:10.16285/j.rsm.2023.0072
多层互剪搅拌桩工法的工艺因素模型试验研究
Model test study of key factors of deep soil mixing mechanism using contra-rotational shear method
摘要
Abstract
Small scale model test was conducted to investigate the technology factors related to contra-rotational shear deep soil mixing(CS-DSM)method,the effects of these factors,such as cement content,blade rotation number T,mixing energy E,rotation speed ratio of internal to external rod RN on the uniformity and unconfined compression strength(UCS)of the mixing pile were explored.The results show that the shearing motions of contra-rotational drilling tool can reduce excessive surface spoil and prevent entrained rotation phenomenon effectively,thereby greatly improve utilization of the binder material.The results of 18 model tests also reveal the inherent connection between T-E-UCS,and the internal relationship between machine operation parameters,mixing energy and strength of the piles.Construction parameters can be determined to ensure the target design strength by the provided calculation method.There is a peak value in the UCS-RN curve,an optimal range of RN=1.8-2.2 is recommended for achieving peak strength of piles in engineering application.The presented technical basis has set the cornerstone for the construction process control and quality assurance as well as quality control of CS-DSM method.关键词
多层互剪搅拌桩技术/搅拌次数/搅拌能量/内外钻杆转速比/CS-DSM工法Key words
technique of contra-rotational shear deep soil mixing/blade rotation number/mixing energy/rotation speed ratio of internal to external rod/CS-DSM method分类
建筑与水利引用本文复制引用
葛春巍,刘钟,余桃喜,兰伟,杨宁晔,赵梦雅..多层互剪搅拌桩工法的工艺因素模型试验研究[J].岩土力学,2024,45(1):68-76,9.基金项目
宁波市高新区重大科技专项(No.2023CX050004).This work was supported by the Key R&D Project of Ningbo Hi-tech.Industrial Development Zone(2023CX050004). （No.2023CX050004）
