tab.8) 𝑚3/h.
With a significant inflow of groundwater (in soils with a filtration ratio of 2 to 40 m /day.), it is recommended to use a method of artificial lowering of groundwater using well point systems, which are located along the outer perimeter of the earthworks at a distance from the pit (trench) slope edge 0,5–1m.
Water inflow to the closed installations for pits is calculated by the formula:
𝑄 = 𝛼 ∙ 𝐶 ∙ 𝑆,
where,𝑄 – water inflow, 𝑚3/h;
𝛼– factor varying from 1 to 3m;
𝐶– filtration coefficient (for clay – 0,005; loam – 0,005–0,4; sandy loams
– 0,2–0,7; sand small – 1–10; average sand – 10–25; coarse sand – 25–75; gravel – 75–1000 m/days);
𝑆– depth of required lowering of the water level (per the task);
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