Environmental Engineering Reference
In-Depth Information
10' Bench
L I-26
I
Existing ground
i
Rock cut
Rock
Topdown wall
(a)
10' setback
Existing ground
10' Bench
1.5
Rock
I
L I-26
I
Existing ground
I
6
Rock cut
stabilized
by shotcrete
and nalis
6
Rock
(b)
(c)
FIGURE 9.122
Various solutions for roadway cuts in soil over fractured rock. (a) Typical roadway rock cut; (b) roadway rock
cut with nails; (c) roadway rock cut with topdown wall.
Existing
ground
Soldier beam
Lean concrete
Wood lagging
Tieback
Overburden
10'±
Rock
FIGURE 9.123
Typical topdown wall with anchored soldier
beam and lagging.
Structural design proceeds when all of the forces acting on the wall have been deter-
mined. Beyond the foregoing discussion, the design of retaining walls is not within the
scope of this volume.
9.5
Investigation: A Review
9.5.1
General
Study Scopes and Objectives
Regional Planning
Regional studies are performed to provide the basis for planning urban expansion, trans-
portation networks, large area developments, etc. The objectives are to identify areas
 
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