extremely shallow depth

Shallow depth and uneven presssure

Shallow depth bored tunnel

shallow depth hard overlying strata

Shallow depth profile

Shallow-depth

tunneling at depth shallow

very shallow depth

Critical Excavation Depth

limit excavation depth

open excavation order excavation method

(2+1) dimensional shallow water wave equation equation

1-D semi-geostrophic shallow water model

1D shallow water equations

1-D shallow water flow

2D shallow water equation

2D shallow water equations

2-D shallow water equations

a shallow mined large-span crossover tunnel

A shrinkage method combining with medium-length hole and shallow hole