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Where deep foundation elements are installed through subsiding soils or other subsiding strata and derive support from underlying firmer materials, consideration shall be given to the downward frictional forces potentially imposed on the elements by the subsiding upper strata.
Where the influence of subsiding soils or strata is considered as imposing loads on the element, the allowable stresses specified in this chapter shall be permitted to be increased where satisfactory substantiating data are submitted.

Related Code Sections

1810.3.4 Soils and Foundations, Subsiding Soils or Strata
Where deep foundation elements are installed through subsiding soils or other subsiding strata and derive support from underlying firmer ...
1810.3.4 Soils and Foundations, Subsiding Soils
Where deep foundation elements are installed through subsiding fills or other subsiding strata and derive support from underlying firmer materials ...
1803.5.6 Soils and Foundations, Rock Strata
Where subsurface explorations at the project site indicate variations in the structure of rock on which foundations are to be constructed ...
1803.5.6 Soils and Foundations, Rock Strata
Where subsurface explorations at the project site indicate variations in the structure of rock on which foundations are to be constructed ...