Ground Improvement encompasses a wide range of techniques which are typically used to improve bearing capacity, control settlements and permeability, mitigate liquefaction triggering as well as increasing slope stability. While ground improvement has historically been used to treat soft or weak ground, more recently its use has expanded to further improve the engineering properties of otherwise ‘competent’ ground which allows for building and structural foundations to be optimised.
Andy O’Sullivan’s team of experts bring extensive experience in the design and construction certification of a wide range of ground improvement techniques, including deep and cutter soil mixing, in situ mass stabilisation, permeation grouting, calcite precipitation, stone columns, soil nailing, low strength rigid inclusions as well as controlled modulus column designs.
Our team bring over 15 years of continued experience in this area of geotechnical design and have designed and certified over 150 ground improvement projects. They have published widely in this area.
Our design approach is first to fully characterise the ground conditions prior to deciding on the best form of ground treatment (if any). Bespoke design solutions are then developed, we don’t apply oversimplistic generic solutions. This disciplined, first principles approach consistently leads us to optimised solutions early.
Andy, who leads our ground improvement practice, has pioneered several ground improvement techniques in the New Zealand and Australian market including deep soil mixing, in situ mass stabilisation, launched soil nailing as well as jet grouting.
Our ground improvement designs have included alternative designs for bridge and building foundations, control of settlement under highway embankments, mitigation of earthquake-induced lateral spreading at port development and improved slope stabilisation properties.