New Zealand roads have long suffered from over- under-slips and settlement, many associated with increased porewater pressure build up and/or weak soils.rnTraditionally such slips have been remediated through measures including bored horizontal drains, gabion or other mass gravity walls, embedded walls (pole/panel, H-piles and bored concrete piles) and excavation/replacement/shear key earthworks.rnSoil mixing is a new technique to New Zealand originating in Europe. To date the process has been used to remediate slips within the Northland region, which effectively improves soil shear strength through mixing of the in-situ soils with lime and/or cement.rnThis paper examines the soil mixing technique, its applicability to slope instability remedial works and outlines the design and construction process including a number of case studies.
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