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Figure 10-1: Direction of movement and soil arching (after Liang and Zeng 2002). Whereas the Liang and Zeng (2002) method is based upon calculation of a lateral earth force to be
resisted by the drilled shafts, Brown, et al. (2010) presents alternative approaches where a) the shear resistance and bending moments in the shafts are evaluated as a function of lateral movement above the slip plane, and b) shafts are laterally analyzed relative to soil masses subject to liquefaction-induced instability.
10.3.2 LRFD Analysis for Slope Stabilization Using the method of slices, as depicted in Figure 10-3, the Liang and Zeng (2002) method develops a resultant net force (F
net-shaft
) that can be distributed in an equivalent loading diagram along the shaft
length above the slip surface, as shown by Figure 10-5, to compute shear, moment, and lateral deflections with a laterally loaded pile p-y analysis software. The force analysis is based on the target geotechnical resistance factors as discussed in Section 10.3.3 for stabilization of the slope. Upon determination
of the net resisting force, F
net-shaft
, required to stabilize the slope, the distributed resultant can be used in a p-y analysis to assess the Geotechnical Service Limit State for the drilled shafts. Thereafter, F
net-shaft is factored to confirm adequate geotechnical resistance
at the Strength Limit State, as discussed in Section
10.3.4 and to
design the shaft reinforcement, as discussed in Section 10.3.5.
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