A hollow bar soil nail wall is used as a temporary soil retention struc-
ture. The retained soil and its properties are shown in Figure 7.61. The
following design parameters are also selected for this project:
Pullout factor of safety, FSp = 2.0
Global factor of safety, FSG = 1.4
Nail horizontal spacing, SH = 1.5 m
Nail vertical spacing, SV = 1.5 m
Nail inclination = 15 degrees
Drillhole diameter, DDH = 200 mm
Ultimate pullout resistance, qu = 120 kN∕m²
Determine:
(1) The preliminary nail length and maximum design nail tensile force
to satisfy the global stability.
(2) The factor of safety against sliding.