Installation Effects of Controlled Modulus Column Ground Improvement Piles on Surrounding Soil

Geosynthetic reinforced column supported embankments and the role of ground improvement installation effects

“…Whilst this shortcoming may sound like a trivial matter, it is well known from field-scale observations of pile installation effects, particularly for driven piles Coop and Wroth 1989;Lehane and Jardine 1994;Eigenbrod and Issigonis 1996) and through the use of analytical methods such as cylindrical cavity expansion techniques (Carter et al 1979;Randolph 2003) and the strain path method (Baligh 1985;Sagaseta and Whittle 2001), that the installation of full displacement piles can induce lateral displacement and excess porewater pressure (pwp) in the vicinity of the pile shaft. This has also been shown recently for an isolated full-scale controlled modulus column (Suleiman et al 2015) and for a large-diameter cast in situ concrete pipe pile (Liu et al 2009) that were both extensively instrumented. A limited number of studies have described group installation effects: Poulos (1994) investigated the effects of driving a pile adjacent to a pile in clay, O'Neill et al (1982) investigated installation effects for a group of steel tube piles, and Kitazume and Maruyama (2007) assessed the stability of a group of deep soil mixed columns.…”

A closed-form solution for column-supported embankments with geosynthetic reinforcement

“…Note that negative skin friction develops at the column shaft, increasing the stress and compression on the column and reducing the stress and compression in the surrounding soil. The deformation shape of the latter is hard to determine and is influenced by certain factors, such as soil structure interactions (Zhou and Yin, 2008;Yin and Zhou, 2009;Su et al, 2010;Zhou et al, 2011;Hokmabadi et al, 2014;Suleiman et al, 2016;Meguid et al, 2017;Yu and Bathurst, 2017;Zhu et al, 2017;Jing et al, 2018;Wang et al, 2018b) and constitutive models adopted for subsoil (Yin et al, , 2010a(Yin et al, , 2010b(Yin et al, , 2011a(Yin et al, , 2011bSexton et al, 2016;Yin et al, 2017). Alamgir et al (1996) innovatively proposed a deformed shape function to investigate the performance of a column-reinforced foundation, which is applied here for this purpose.…”

Pore Water Pressure Development in Soft Soil due to Installation and Loading of Controlled Modulus Columns

“…CMCs are used in commercial building foundations as well as in large infrastructure projects (e.g., Pearlman and Porbaha 2006;Wong and Muttuvel 2013). Full displacement screw augers induce large displacements and modify stress states in the surrounding soil (Larisch et al 2014;Pfeiffer and Van Impe 1993;Slatter 2000;Suleiman et al 2015); however, these installation effects are outside the scope of this paper.…”

“…The study, however, was limited to stiff, fine-grained soils. Suleiman et al (2015) performed comprehensive series of measurements of horizontal stress changes, pore water pressure, and lateral displacement during the construction of CMC columns and static vertical loading tests. They used push-in pressure sensors fitted with a piezometer, allowing for measuring total horizontal stresses and pore water pressure in the soil and shape acceleration arrays to monitor the evolution of soil lateral displacements.…”