Analysis of Deep Jet Grouting Field Trial in Clay

Ho, Chu E.

doi:10.1061/41023(337)30

Cited by 7 publications

(2 citation statements)

References 2 publications

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“…Ground modification technologies based on chemical reactions, such as deep mixing (Chen et al, 2013;Han et al, 2007;Horpibulsuk et al, 2011;Huang and Han, 2009;Shen et al, 2008) and jet grouting (Bergado and Lorenzo, 2003;Brill et al, 2003;Burke, 2004;Essler, 2012;Guatteri et al, 2012;Ho, 2009;Koshima and Guatteri, 2006;Mihalis et al, 2004), are commonly adopted for mitigating ground movement or improving excavation stability associated with infrastructure construction in soft soil deposits (Peng et al, 2011;Tan and Li, 2011;Tan and Wei, 2012;Xu et al, 2008Xu et al, , 2013aXu et al, , 2013bYin et al, 2010Yin et al, , 2013. In jet grouting, fluid is injected through small-diameter nozzles into the subsoil at high speed to erode the soil around the rod.…”

Section: Introductionmentioning

confidence: 99%

Jet grouting for mitigation of installation disturbance

Wang

Shen

et al. 2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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To reduce the impact of installation of horizontal jet grouting columns on surrounding ground, a new horizontal jet grouting technique termed controlled discharge horizontal jet grouting is developed. A field trial programme is conducted to verify the application of the technique technology. Field measurements of ground surface displacement and induced excess pore-water pressures are obtained during implementation of the technique. Five trial jet grout columns are installed at 2 m below the ground surface and subsequently exposed for measuring and testing. The observed vertical displacements of the ground surface range from 0 . 4 to 9 . 4 mm, with maximum excess pore-water pressures generated during the field trial varying between 3 . 5 and 25 . 6 kPa. The diameters of the exposed jet grout columns range from 1 . 1 to 1 . 4 m. Core samples extracted from the trial jet grout columns indicate that the quality of the jet-grouted soil formed is good, with total core recovery of 70-95% and rock quality designation of 79-92%.Unconfined compressive strength tests show that the 28-d strength ranges from 0 . 9 to 1 . 5 MPa, and Young's modulus at 50% failure load (E 50 ) is between 61 . 5 and 145 . 3 MPa. The field trial results confirm the applicability of the technique for achieving low-impact installation of horizontal jet grouting.

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Section: Introductionmentioning

confidence: 99%

Jet grouting for mitigation of installation disturbance

Wang

Shen

et al. 2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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“…Jet grouting has been deemed as one of the most widely used ground improvement techniques for strengthening soft soil deposits and preventing groundwater seepage from leaking fractures or fissures [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Jet grouting is frequently used for the launching of shield machines or tunnel construction in complex geological conditions.…”

Section: Introductionmentioning

confidence: 99%

Simple Method to Predict Ground Displacements Caused by Installing Horizontal Jet-Grouting Columns

Wang

Shen

Cheng

2018

Mathematical Problems in Engineering

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During the horizontal jet grouting in soft ground, injection of large volumes of water and grout into the soil can lead to significant ground displacements. A simple method is proposed in this paper to predict the ground displacements caused by installing horizontal jet-grouting columns. The process of installing a horizontal column is simplified as the expansion of a cylindrical cavity with a uniform radial stress applied at plastic-elastic interface in a half plane. In this study, the analytical solution is adopted to calculate the deformation induced by the expansion of a cylindrical cavity. Considering the main jetting parameters (jetting pressure of the fluid, flow rate of the fluid, and withdrawal rate of the rod) and the soil properties (stiffness of the surrounding soil), an empirical equation to estimate the radius of plastic zone is developed. Two field tests are carried out in Shanghai, China, to verify the correctness and applicability of the proposed method. Comparisons between the predicted and measured values indicate that the proposed method can provide a reasonable prediction. The proposed simple method can be recommended as a useful tool for the design of ground improvement by means of horizontal jet grouting.

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