ABSTRACT
In sandy soils, the experimental findings (McKinley 1993, McKinley & Bolton 1999, Sanders 2007, Bezuijen et al. 2007, Eisa 2008) show that the injection pressure causes a mixture of water and finer particle to filtrate from the grout body into the adjacent sand pores. Compensation efficiency reduces as pressure filtration occurs. The amount of fluid lost by pressure filtration depends on the grout water-cement ratio and bentonite content, and on the injection rate. Eisa (2008) has shown that fast injections of grout with relatively high bentonite content and water-cement ratio result in low volumes lost by pressure filtration and high compensation efficiencies.
