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Open Access

Model test study of key factors of deep soil mixing mechanism using contra-rotational shear method

Chun-wei GE1,2, Zhong LIU1,2,3( ), Tao-xi YU1,2, Wei LAN1,2, Ning-ye YANG1,2, Meng-ya ZHAO1,2
Zhejiang Kunde Innovate Geotechnical Engineering Co., Ltd., Ningbo, Zhejiang 315100, China
Kunde Research Institute of Intelligent Geotechnical Technology, Ningbo, Zhejiang 315100, China
Central Research Institute of Building and Construction, MCC Group, Beijing 100088, China
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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 column 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 columns. 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 columns 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.

Keywords

technique of contra-rotational shear deep soil mixingblade rotation numbermixing energyrotation speed ratio of internal to external rodCS-DSM method

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Rock and Soil Mechanics
Volume 45 Issue 1,
January 2024
Pages 68-76
DOI: 10.16285/j.rsm.2023.5072
Cite this article:
GE C-w, LIU Z, YU T-x, et al. Model test study of key factors of deep soil mixing mechanism using contra-rotational shear method. Rock and Soil Mechanics, 2024, 45(1): 68-76. https://doi.org/10.16285/j.rsm.2023.5072

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Received: 19 January 2024
Accepted: 23 March 2023
Published: 17 January 2024
© 2024 Rock and Soil Mechanics
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