Pile Formation Characteristics and Permeability Coefficient of Horizontal MJS Piles in Clay Strata
To investigate the pile performance and water-sealing capability of the horizontal jet grouting method(Metro Jet System,MJS)in clay formations,this study is set against the background of the Suzhou Metro Lindun Road Station underpass project.Test pile experiments were conducted in similar geological conditions to reveal the pile characteristics of horizontal MJS test piles.Simultaneously,the permeability coefficients of indoor cement soil and on-site MJS cement soil were tested and compared to assess their water-sealing performance.The experimental results indicate that when the soil layer is uniform,the reinforced body typically exhibits a cutting and stirring type,with its shape influenced by soil properties,construction parameters,and gravitational effects.It is generally not a semicircular shape,and its vertical'diameter'is often larger than the horizontal 'diameter'.The permeability coefficients of indoor cement soil and on-site test pile core samples are close,with the majority of samples showing permeability coefficients in the range of 2×10-8 to 8×10-8 cm/s,demonstrating good water-sealing performance.
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