Improvement Efficacy of RJP Method in Shanghai Soft Deposit

Shen, Shui‐Long; Luo, C Y; Xiao, Xiao-Chun; Wang, Jialin

doi:10.1061/41025(338)18

Cited by 14 publications

(4 citation statements)

References 2 publications

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“…The hydraulic conductivity of jet-grouting is relatively high when used in coarse permeable soils. This fact is consequence of the lack of uniformity of the diameter of jet-grouting columns (Modoni et al, 2006, Flora et al, 2013and Shen et al, 2013c and of the difficulties arising when this is performed in a coarse soil (the cement cannot be mixed effectively with sand soil) (Shen et al, 2009 andShen et al, 2013a).…”

Section: Discussionmentioning

confidence: 99%

Deep enclosures versus pumping to reduce settlements during shaft excavations

Pujades

Vàzquez-Suñé

Carrera

et al. 2014

Engineering Geology

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Section: Discussionmentioning

confidence: 99%

Deep enclosures versus pumping to reduce settlements during shaft excavations

Pujades

Vàzquez-Suñé

Carrera

et al. 2014

Engineering Geology

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“…However, the RJP method uses a secondary cutting method to cut soils with ultra-high-pressure water and compressed air jets, and the ultra-high-pressure cement slurries and compressed air jets of the upper and lower sections are generated by a device installed at the front end of the porous drill pipe; that is, the upper section uses ultra-high-pressure water supplemented with coaxial compressed air for one cutting pass, and the lower section uses an ultra-high-pressure cement slurry supplemented with coaxial compressed air for secondary cutting. The process increases the cutting depth through the secondary cutting pass in the upper cutting section, and the upper cutting space can be used to smoothly discharge the mud, thereby improving the efficiency of the lower nozzle that is spraying mud and ensuring the rotary solid diameter [7,8,14]. The RJP method is shown in Figure 1.…”

Section: Process Principlementioning

confidence: 99%

Field Study on the Waterstop of the Rodin Jet Pile Method in a Water-Rich Sandy Gravel Stratum

Guan

Yang

2019

Applied Sciences

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Due to the increasing depths of underground urban construction, the surrounding environment and hydrogeological conditions are becoming increasingly complex, and conventional high-pressure rotary jet grouting has become unable to meet construction needs. At present, Rodin jet pile (RJP) ultra-high-pressure rotary jet grouting has been widely used as a grouting reinforcement method for deep and large foundations in silty soils, fine sands and clay strata; however, there have been no successful applications in a sandy gravel stratum with high water content (namely, water-rich sandy gravel stratum). Therefore, this paper uses the ventilating shaft in a section of the Beijing Metro as the construction background to carry out field tests on the RJP ultra-high-pressure rotary jet grouting method and waterstop in a water-rich sandy gravel stratum. Through a series of experiments monitoring the formation deformation and pore water pressure and exposing the pile diameter, pile occlusion, pile strength, and permeability of the test pile construction process, it is believed that, for the RJP ultra-high-pressure construction method in a water-rich sandy gravel stratum, reliable jet solidification can occur, the joint between jets can be achieved, the solid strength can reach 10 MPa or higher, and the permeability coefficient can reach 10−8 cm/s. Therefore, RJP ultra-high-pressure rotary jet grouting can be applied as a waterstop method in water-rich sandy gravel stratum.

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“…There are several previous studies about the application of the jet grout method and the evaluation of their performance [4][5][6][7][8][9][10][11][12]. The main subjects of the previous studies about jet grouting are the design of the columns [13][14][15][16][17], the mixture of grouting material [18][19][20], the injection methods [21][22][23][24], and the quality controls of the columns [25][26][27]. Farhangi et al [28] have numerically demonstrated that using jet-grouted micro piles significantly reduces the risk of liquefaction in clean sands.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach for Assessing the Performance of Offshore Ground Improvement in Floating Storage and Regasification Unit (FSRU) Terminal Construction

Özcan

Gökçeoğlu

2023

Applied Sciences

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A floating storage and regasification unit (FSRU) terminal has been planned to be constructed in Saros Bay (Türkiye). This study presents the ground improvement method using jet grouting to prevent the liquefaction of marine sediments in the project area. An approach for performance assessment of jet column construction is also discussed. The study site has a liquefiable ground level with a thickness changing between 2 m and 8 m. Jet grout columns with an 80 cm diameter were constructed under the sea level, which varied between 4 m and 18 m for ground improvement. The main issue is controlling the quality and performance of these jet columns. Therefore, a practical quality control procedure containing observational, mechanical, and geophysical methods for offshore grouting operations was proposed. The factor of safety values against liquefaction varied between 0.04 and 0.29 for natural conditions, while the minimum factor of safety after jet column constructions was obtained as 1.01. The results of the numerical analyses showed that the constructed terminal has sufficient performance against liquefaction. Consequently, the results of these methods have demonstrated that the jet grout applications performed by following this procedure are a suitable and effective improvement method for offshore soils.

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Improvement Efficacy of RJP Method in Shanghai Soft Deposit

Cited by 14 publications

References 2 publications

Deep enclosures versus pumping to reduce settlements during shaft excavations

Deep enclosures versus pumping to reduce settlements during shaft excavations

Field Study on the Waterstop of the Rodin Jet Pile Method in a Water-Rich Sandy Gravel Stratum

A Novel Approach for Assessing the Performance of Offshore Ground Improvement in Floating Storage and Regasification Unit (FSRU) Terminal Construction

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