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Table 1 The physical parameters of the underground rock–soil layers

From: Effect of groundwater forced seepage on heat transfer characteristics of borehole heat exchangers

Soil media Depth of distribution
σ (m)
Horizontal permeability
kXY (m2)
Porosity
εs
Volumetric heat capacity of the soil
csρs (J m−3 K−1)
Thermal conductivity
λs
(W m−1 K−1)
Longitudinal thermal dispersivity
αL (m)
Transverse thermal dispersivity
αT (m)
Initial temperature of soil layer
TS0/℃
Clay 0–9 5.0 × 10–14 0.45 2.7 × 106 1.10 0.3 0.03 16
Silty clay 9–24 5.0 × 10–14 0.40 3.2 × 106 1.20 0.3 0.03 16
Fine sand 24–44 1 × 10–12 0.35 1.4 × 106 0.95 3.0 0.30 16
Silty sand 44–80 8.0 × 10–13 0.38 2.4 × 106 1.60 0.1 0.01 16
Silty clay 80–83 5.0 × 10–14 0.40 3.2 × 106 1.20 0.3 0.03 16