Thickness of the backfill area around the cables, upper part (used for multi-layer backfill).

Symbol
$s_{\mathrm{3}}$
Unit
Formulae
$H_{\mathrm{T}} - s_{\mathrm{1}} - s_{\mathrm{2}}$Paper R. de Lieto Vollaro et al. (2011)
$H_{\mathrm{c}} - s_{\mathrm{1}} - s_{\mathrm{2}}$Paper R. de Lieto Vollaro et al. (2014)
Related
$H_{\mathrm{c}}$
$H_{\mathrm{T}}$
Used in
$R_{\mathrm{q11}}$
$R_{\mathrm{q21}}$
$R_{\mathrm{q22}}$
$R_{\mathrm{q24}}$