Trench Cutting Re-mixing (TRD) is an in-situ deep wall construction method that creates load-bearing structural walls by sequentially cutting and re-mixing soil with cement-based binder in a continuous excavation process. Developed primarily in Japan, TRD technology represents an advancement in the soil mixing family of technologies, occupying a distinct position between traditional Cutter Soil Mixing (CSM) and mechanized diaphragm wall construction. The method is engineered to produce homogeneous, structurally competent walls by means of mechanical cutting and thorough blending of native soil with cementitious slurry, creating monolithic barriers with controlled strength parameters and permeability characteristics. The primary applications of TRD include construction of cutoff curtains in contaminated land remediation, diaphragm walls for basement and deep excavation support, seepage control structures in dam construction, and load-bearing perimeter walls for underground facilities. TRD technology is particularly advantageous where space constraints limit the deployment of conventional sheet pile or soldier pile systems, where soil conditions present challenges for standard diaphragm wall grabbing equipment, or where the engineering requirements demand seamless, continuous wall sections without joint vulnerabilities. The method also serves applications in soft soil regions, weak rock formations, and mixed geologies where conventional excavation techniques prove inefficient or produce excessive vibration and noise. The TRD process operates through a specialized trenching machine equipped with rotating cutting wheels or drums that simultaneously excavate and remix soil at depth. As the cutting head advances vertically or at prescribed angles, cementitious slurry is injected directly into the cutting chamber and mixed with excavated material, creating a plastic mass that is deposited in the trench behind the cutting head. The overlapping of successive panel cuts produces a continuous, monolithic wall structure. The depth capacity, cutting width, and mixing intensity are controlled through hydraulic systems, allowing contractors to tailor the wall specifications to project requirements. Real-time monitoring of slurry volume, injection pressure, and cutting resistance provides quality assurance during placement. Equipment in the TRD category encompasses full-scale production machines mounted on heavy cranes or crawler carriers, designed for panels typically ranging from 0.8 to 3.0 meters in width and capable of reaching depths from 20 to over 100 meters depending on soil conditions and machine specification. Configurations include single-drum and multi-drum cutting heads, with variable rotation speeds and oscillation amplitudes to accommodate different soil types. Associated equipment includes slurry plants, centrifuges for slurry management, casing and guide wall installation systems, and quality assurance monitoring instruments. Selection criteria for TRD systems include project depth requirements, wall dimensions and positioning accuracy, soil profile and strength targets, required wall permeability and durability specifications, site access and spatial constraints, disposal of excavated material, and budget for both equipment mobilization and operational logistics. Contractors evaluate cutting tool durability, slurry consumption rates, cycle times, and environmental compliance requirements. Relevant standards including ISO 21010 (Diaphragm Walls) and local geotechnical design codes govern TRD wall design, material specifications, and execution quality, while DIN 4126 and EN 1537 provide guidance on temporary and permanent support structures incorporating TRD walls.
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