Effect of DSM Grids on Shear Stress Distribution in Liquefiable Soil

A study of effectiveness of ground improvement for liquefaction mitigation

“…The DMM method, an in-situ admixture stabilization technique with cement and/or lime as binder or mixing agent, has been widely used for liquefaction mitigation in practice (Mitchell, 2008;Chu et al, 2009;Nguyen et al, 2012, Rayamajhi et al, 2013Bruce, et al, 2013). By constructing column shapes of DMM mixed soil, any arbitrary shape of mixed elements can be formed, such as block, wall and lattice types.…”

“…By constructing column shapes of DMM mixed soil, any arbitrary shape of mixed elements can be formed, such as block, wall and lattice types. Lattice-and wall-shape DMM elements are widely used for liquefaction mitigation (Namikawa et al, 2007;Nguyen et al, 2012). The focus herein is to optimize the configuration of the DMM improved zone based on improved deformation and associated damage by demonstrating the influence of various DMM improved zone locations and geometries on residual deformation of caisson wall-soil system.…”

“…Unlike densification methods for mitigation, the effectiveness of reinforcement cannot be verified based on post-treatment. Engineers must utilize theoretical analyses for their design and effectiveness verification (Baez, 1995;Hausler, 2002;Martin and Olgun, 2006;Nguyen et al, 2012Boulanger, 2012). Comparing the individual columnar elements, underground wall panels or lattice shaped elements are more effective.…”

“…For example, grouted materials produced by grouting are normally modeled as elastic-perfectly plastic materials, and Mohr-Coulomb failure envelop is always used as failure criteria based on Cooke (2000), Nguyen et al (2012) and Bruce et al (2013). The most important parameter used for design and construction quality control and assurance for DMM project is the unconfined compressive strength of the DMM mixed material (Elias et al, 2006;Filz, 2012;Bruce et al, 2013).…”

“…Three dimensional view of the DMM mixed wall and DMM improved zoneAccording toBruce et al (2013), there are differences of opinion regarding the most appropriate strength envelope for DMM mixed soils for use in numerical analysis, and it is acceptable to use an effective friction angle of 30 to 35 and cohesion intercept of c = 1/2 unconfined compressive strength for DMM mixed materials Nguyen et al (2012). used a linear elastic model to describe the DMM mixed lattice element in unimproved liquefiable soil.…”