Deep dynamic compaction in the hole:
The new patented technology of deep dynamic compaction (DDC) in hole foundation treatment (patent number ZL921KLOC-0/4452.0) is to first form a hole in the foundation, drive a dynamic compaction hammer into the hole, and then carry out dynamic compaction while adding materials or layering fillers. Deep dynamic compaction (DDC) technology in holes won the highest award-Eureka Gold Award at the 52nd Eureka World Invention Expo, which is the only gold award of China's foundation treatment technology in the world so far.
The difference between DDC technology and other technologies is that dynamic compaction is to introduce deep foundation through tunnel, and use special-shaped heavy hammer with high kinetic energy, overpressure and strong compaction to carry out deep dynamic compaction from bottom to top, so that the fill in the hole can be consolidated vertically, while the soil around the pile can be strengthened by lateral strong compaction. According to different soil quality, different technologies are adopted.
How to replace the cushion:
Suitable for the treatment of shallow soft foundation and uneven foundation. Its main function is to improve the bearing capacity of foundation, reduce settlement, accelerate the drainage consolidation of soft soil layer, prevent frost heave and eliminate the expansion and contraction of expansive soil.
Dynamic compaction method:
It is suitable for treating gravel soil, sandy soil, silty soil, cohesive soil, collapsible loess, miscellaneous fill and plain fill with low saturation. Dynamic compaction replacement method is suitable for projects with poor deformation control on high saturated silt, soft plastic cohesive soil and other foundations, and its applicability and treatment effect must be determined through field tests before design.
Dynamic compaction method and dynamic compaction replacement method are mainly used to improve soil strength, reduce compressibility, improve soil anti-vibration liquefaction ability and eliminate soil collapsibility. Saturated cohesive soil should be combined with surcharge preloading and vertical drainage.
Gravel pile method:
It is suitable for compacting loose sand, silt, cohesive soil, plain fill, miscellaneous fill and other foundations, improving foundation bearing capacity and reducing compressibility, and can also be used for treating liquefiable foundations. For projects with lax deformation control on saturated clay foundation, sand-gravel piles can also be used for replacement treatment, so that sand-gravel piles and soft clay can form a composite foundation, accelerate drainage consolidation of soft soil and improve foundation bearing capacity.