Effects of Cement Grout Characteristics on Formation and Strength of Jet Grouting Columns

Senkaya, Alican; Toka, Ekrem Burak; Olgun, Murat

doi:10.1007/s13369-022-06678-9

Cited by 10 publications

(3 citation statements)

References 44 publications

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“…The jet grouting column technique is a popular foundation improvement approach [1][2][3] and is extensively employed in slope stabilization, 4,5 cut-off walls, 6,7 the pre-treatment of tunneling, 8,9 and so forth. The equipment is flexible, and the column shape is easily controlled.…”

Section: Introductionmentioning

confidence: 99%

Modeling diameter of jet grouting columns using Bayesian framework

Zhao,

Chen,

Wang

2023

Num Anal Meth Geomechanics

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This study proposes a new model in explicit form to predict the diameter of the jet grouting column of three popular jet grouting systems (i.e., single, double, and triple). The proposed model can quantify the uncertainty associated with the prediction. Bayesian model selection was used to determine the optimal models and, the bootstrap sampling method was adopted to avoid bias in the collected database. The predictions agree well with the measured data, and the 95% credible intervals can cover almost all the measured data on the testing dataset, which indicates the robustness of the proposed model. A simple formula combined with a table was established to facilitate the engineers in applying the proposed model. The results reveal that soil type has a significant impact on diameter prediction. Uncertainty quantification can reveal possible fluctuations in column diameter and is vital to get a cost‐efficient design.

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Section: Introductionmentioning

confidence: 99%

Modeling diameter of jet grouting columns using Bayesian framework

Zhao,

Chen,

Wang

2023

Num Anal Meth Geomechanics

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“…Jet grouting technology is a hydraulic soil mixing method used to improve the strength of soft soils due to its advantages, such as rapid construction and significant increase in the strength of weak soils [14][15][16][17], it has been widely used in the reinforcement construction of geotechnical engineering structures, such as slope reinforcement [18,19] and ground reinforcement before tunnel excavation [20,21]. High-strength jet grouting is a form of jet grouting technology that forcibly mixes and decomposes the soil, thus forming a cement slurry and soil mixed with the cement soil solidification body [22][23][24][25]. The MJS (metro jet system) method, also known as the omni-directional high-pressure jet method, is a form of jet grouting technology.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis and Safety Factors of the Excavation Face of a Pipe Screen Tunnel in a Soft Soil Area

Pan,

Wang,

Diao

et al. 2023

Applied Sciences

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With the rapid development of urban rail transit and underground space construction, the advantages of the concealed excavation method are gradually highlighted in the urban center area affected by a complex engineering environment. At present, the pipe curtain method with a flexible section and wide application of the soil layer is being widely used in engineering, but the research on the stability of the excavation face during the construction of the pipe curtain method in soft soil areas still has not formed a complete system. Therefore, this paper analyzes the stability of the excavation face under different reinforcement conditions and the influence of different spacing, numbers, and strength of MJS (metro jet system) zones on the stability of the excavation face of the pipe curtain method based on the actual project of the Guiqiao Road Station of the Shanghai Metro, China, and gives a reference for the reinforcement of the palm face in the excavation process of the pipe curtain method in soft soil areas. The study shows that the safety coefficient of the excavation face decreases with the increase in the slope angle of the excavation face, with the increase in spacing of the MJS zone, and with the increase in height of the MJS zone arrangement, while the safety coefficient of the excavation face increases with the increase in strength of the MJS zones themselves and the increase in the strength of the soil between the MJS zones. Further, the machine learning model is applied to predict the stability of the excavation face under different cases, and the relevant fitting accuracy is above 0.9, which can predict the stability of the excavation better.

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“…In the proposed core grout connection method (Figure 3), core grout is poured to the bottom of the PHC pipe pile, and deformed reinforcing bars are used as connecting components with the upper reaction beam. The grout has the characteristics of fast early strength development, high later strength, and vibrationfree, which is to pour inside the PHC pipe pile [18,19]. The deformed reinforcing bars have high-strength and high elastic modulus, and are equipped with connectors, which is convenient for connection [20,21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bonding Performance between Prestressed Concrete Pipe Piles and Core Grout

Yin,

Li,

2023

Advances in Civil Engineering

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To make the bearing capacity tests safer and more affordable for prestressed high-strength concrete (PHC) piles, this paper proposes a reaction device for anchor piles filled with core grout based on the geometric and mechanical characteristics of PHC piles. The proposed reaction device has the advantages of convenient construction, strong controllability of the connection quality and low cost. In addition, the pile will not experience prestress unloading or tensile stress under the effect of the upward pulling load. To promote the application of the reaction device developed for PHC pile bearing capacity tests, experimental studies are conducted on the bonding performance between the core grout and the inner wall of the PHC pile. The influence of various factors such as the strength of the core grout, the grouting length, the curing time, and the inner diameter of the PHC pile on the bond strength between the core grout and the inner wall of the PHC pile are investigated. Results show that as the inner diameter of the PHC pile increases, the bond strength between the core grout and the inner wall of the PHC pile decreases with a maximum difference of 5%. The bond strength decreases as the grouting length increases, and gradually stabilizes, with a difference of no more than 10% between the maximum and minimum bond strength values. The higher the strength of the grout is, the greater the bond strength between the core grout and the inner wall of the PHC pile is. The bond strength between the core grout and the inner wall of the PHC pile increases with the increase of the curing time within 28 days of curing, and the bond strength at 3 days meets the requirements of the PHC pile bearing capacity test.

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Effects of Cement Grout Characteristics on Formation and Strength of Jet Grouting Columns

Cited by 10 publications

References 44 publications

Modeling diameter of jet grouting columns using Bayesian framework

Modeling diameter of jet grouting columns using Bayesian framework

Stability Analysis and Safety Factors of the Excavation Face of a Pipe Screen Tunnel in a Soft Soil Area

Experimental Study on Bonding Performance between Prestressed Concrete Pipe Piles and Core Grout

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