Jet grouting with the superjet-midi method

Fang, Yung‐Show; Kao, Chung Cheng; Chou, J. P.; Chain, K. F.; Wang, D. R.; Lin, Chih-Chiang

doi:10.1680/grim.2006.10.2.69

Cited by 18 publications

(10 citation statements)

References 2 publications

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“…This system is different from the earlier jet-sounding technique which used only microphone and headset to receive and broadcast the sound generated during jet grouting (Fang et al 2006). Little quantitative information could be gathered from this earlier method.…”

Section: Literature Reviewsmentioning

confidence: 98%

Evaluation of jet grout column diameters by acoustic monitoring

Cheng

Liao

Yamazaki³

et al. 2017

Can. Geotech. J.

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To evaluate the diameter of jet grout columns actually formed under the ground, several methods had been developed over the past years. Nevertheless, uncertainty still exists in different methods mostly due to the variations of ground and grouting conditions. This study proposes an acoustic monitoring system capable to directly record the jet grouting sounds picked up at different distances from the jet nozzle. To correlate the actual diameter of the jet grout column with the monitored sound prints, a field test was conducted in an interlayered sandy and gravelly soil and the jet grout column was excavated for dimension measurement. The recorded sound show that the distribution of the threshold peak amplitudes at different distances can be represented by the curve of normal distribution function. In addition, the standard deviation and the mean of the normally distributed threshold peak amplitudes can be used as indicators to determine the effective diameter of the jet grout column for a specific jet grouting project. Although this acoustic monitoring method would be costly and time consuming to examine all jet grout columns, it is suitable for frequent use in trial tests for finding reasonable grouting parameters to form jet gout columns with design diameter.

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Section: Literature Reviewsmentioning

confidence: 98%

Evaluation of jet grout column diameters by acoustic monitoring

Cheng

Liao

Yamazaki³

et al. 2017

Can. Geotech. J.

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show abstract

“…According to a large number of engineering applications, theoretical experiments [15][16][17], and in particular, the various numerical simulations and field tests of recent years [18][19][20][21][22], it is believed that the standard penetration test numbers (N) and formation cohesion (c) values below have a distinct influence on the effective diameters of the piles, and the effective diameter of the ultra-high-pressure jet grouting method under different soil conditions is summarized [23][24][25], as shown in Table 1.…”

Section: Factors Affecting the Pile Diametermentioning

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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“…As stated above, the soils outside the pit must be improved to reduce their Figure 10: Effective stress path and failure envelope for failure caused by launching of a shield for soils immediately behind the wall. 10 Geofluids permeability and increase their strength; the soil improvement zone outside the pit is assumed to be 10 m long, 9 m wide, and 13.6 m thick. Figure 4 presents the assumed details of the tunnel eye and the soil improved zone in the model.…”

Section: Construction Background and Analytical Approachesmentioning

confidence: 99%

Geohazard Caused by Groundwater in Urban Underground Excavation

Hsiung

2018

Geofluids

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This paper addresses the important role of water in geohazard and failure in urban underground excavation. These so-called underground water-related hazards, such as leakage of the tunnel eye due to launching and docking of the shield, failure of the cross-passage excavation, and failure of the retaining wall caused by water ingress for deep excavation, often lead to catastrophic disasters. Leakage of the tunnel eye during shield launching that results in failure was selected for further analysis using finite element simulations. According to this work, the flush-in of water mainly leads to the failure of soils located at the invert of the tunnel immediately behind the wall, and gravity is the cause of such failure phenomena; these findings agree with field observations. A significant reduction in the pore pressure of soils behind the wall associated with water relief through the tunnel eye and the quantity of water flow into the excavation is predicted. Piping failure is also suggested to occur during shield launching under the current arrangements. Finally, according to parametric studies, reducing the soil permeability and increasing the cohesion force are recommended to prevent the opportunity for failure.

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Jet grouting with the superjet-midi method

Cited by 18 publications

References 2 publications

Evaluation of jet grout column diameters by acoustic monitoring

Evaluation of jet grout column diameters by acoustic monitoring

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

Geohazard Caused by Groundwater in Urban Underground Excavation

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