One question about Wind Farm NOP presented. I note 780kPa was considered in the working platform design. Is it the maximum pressure under the worst operating cases (corresponding to different boom directions)? Thanks.
Indeed, typically the loads configuration in the analysis consider the worst case scenario during critical lift where the pressures under the track are the highest. However interestingly for the NOP case where very large crane was utilised, the critical pressures were mobilised during assembling the crane - self-lifting of the crane boom – this is a common case for ultra large cranes.
Well structured presentation. One main issue experienced in soft soil is bog down of construction equipment, while placing fill on reinforcement or fill height is about 1m. (similar to Sunshine coast example)
Geogrids installed on weak soils Su<10kPa even with very thin layer of aggregate, can support construction equipment. However tracked plants, typically front loaders distribute the aggregate or light front dumpers for the very initial 0.5m, wheeled vehicles such trucks may cause large deformation due to point load, but for geogrids that would be the case for the first 0.5m to 0.8m. It is worth noting that this is where geogrids are commonly utilised, as they help to distribute the load from the surface. Geotextiles on the other hand do not affect bearing capacity of the platform surface as they easily deformed with the platforms aggregate, so this is where construction equipment may sink, and in fact even recently self propelled modular transporter sink due to inadequate platform preparation with geotextile.
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