T/JSAS 059-2024 Mud seal wall construction specifications

Scope

Scope: This document specifies the basic requirements, raw materials, processes, inspections, and evaluations for the construction of slurry sealing walls. This document applies to the construction, inspection, and evaluation of slurry sealing walls with a groundwater permeability greater than 1×10-5cm/s and a construction depth not exceeding 20m. Main technical content: The raw materials for slurry sealing walls include bentonite, coupling agents, and mixing water. Organize the materials on site. The bentonite and coupling agents entering the site should be accompanied by factory-issued quality certificates. An automatic weighing system should be used on site to ensure the accurate dosage of bentonite, water, and coupling agents. The slurry sealing wall mix ratio is shown in Table 1. Table 1: Slurry Sealing Wall Construction Mix Ratio Diameter (m) Distance between piles (m) Bentonite Dosage Coupling Agent Dosage Density (g/cm³) Water-to-cement Ratio Bentonite Quantity (kg) Coupling Agent Quantity (kg) Water Quantity (kg) Grouting Volume (L) Parameter (Material Per Meter) 0.7 0.5 10% 0.2% 1.45 0.9 156 0.246 2.0 Note: 1. The bentonite dosage is 10% of the original soil mass. 2. The coupling agent dosage is 0.2% of the total mass of bentonite and water. 3. The original soil mass is calculated based on the diameter of the pile cylinder multiplied by the soil density. The soil density is selected according to the geological survey data. 4. The allowable error of the bentonite, coupling agent dosage, water quantity, and slurry density shall not exceed 5% of the respective dosage. 6.3 Preparation of Construction Equipment The slurry sealing wall construction uses double mixing head deep silt mixing machines. The schematic diagram of the deep mixing machine drill head is shown in Figure 3. The number of construction machines shall be determined according to the construction organization design, and the power of

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