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The TRD method, also known as the continuous mixing wall method under uniform thickness cement soil, is based on the principle that a chainsaw tool box is vertically driven into the stratum and then moves horizontally laterally. At the same time, the chain drives the tool to rotate up and down, stirring and mixing the original soil and injecting cement slurry to form a waterstop wall of a certain strength and uniform thickness. The TRD construction method was developed and researched in Japan in the early 1990s. It is a complete set of advanced construction equipment and methods that can continuously form walls in various soil layers and gravel layers. It is mainly applied in various construction projects, underground projects, bank protection projects, foundation reinforcement of DAMS and embankments, and anti-seepage treatment, etc.
TRD Method - Process Principle
1、Principle: After the chain-blade cutting tool is cut vertically and continuously to the design depth, it is pushed horizontally and injected with cement slurry to form a continuous, equal thickness and seamless cement wall ;
2、Insert core material (H-shaped steel, etc.) into the cement mixing wall of equal thickness to form a composite retaining and water stop structure.
TRD Method - Features and Scope
1. It is applicable to clay, sand, gravel and gravel layers, and also has good applicability in dense sand layer with 30-60 standard penetration value and soft rock with saturated uniaxial compressive strength not exceeding 10 MPa;
2. The depth of the finished wall can reach 70 meters, and the verticality deviation shall not be greater than 1/250 (when the TRD verticality deviation is not greater than 1/300 when it is used as the reinforcement of the inner and outer trench walls of the ground wall);
3. Wall thickness 550-950 mm
4. The cement is evenly mixed, and the unconfined compressive strength is 0.5-2.5MPa;
5. The wall has good water resistance, and the permeability coefficient can reach 1x10-6 cm/s to 1x10-7 cm/s in sandy soil;
6. The spacing of the interpolated profiles can be evenly arranged with equal spacing, and the rigidity of the enclosure is more uniform;
7. The maximum height of construction machinery is generally not more than 12 meters, and the center of gravity of construction frame is low, with good stability.
