UFC 3-270-05
15 March 2001
CHAPTER 13
DISTRESS 71, SETTLEMENT OR FAULTING
13.1. Description. Settlement or faulting is a difference of elevation at a joint or crack caused by
upheaval or consolidation. Deduct curves for settlement or faulting are shown in Figure 13.1.
13.2. Severity Levels. Severity levels are defined by the difference in elevation across the fault
and the associated decrease in ride quality and safety as severity increases.
13.3. Difference in elevation.
Runways/Taxiways
Aprons
<1/4 in. (6.4 mm)
1/8 ≤ 1/2 in. (3.2 - 12.7 mm)
L
(Figures 13.2. and 13.3.)
1/4 - 1/2 in. (6.4 - 12.7 mm)
1/2 - 1 in. (12.7 - 25.4 mm)
M
(Figure 13.4.)
>1/2 in. (12.7 mm)
>1 in. (25.4 mm)
H
(Figures 13.5. and 13.6.)
13.4. How to Count. In counting settlement, a fault between two slabs is counted as one slab. A
straightedge or level should be used to aid in measuring the difference in elevation between the
two slabs.
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