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1808.3.2 Piles Installed by Jacking or Other Static Forces
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The allowable capacity of a pile installed by jacking or other static forces shall be not more than 50 percent of the load or force used to install the pile to the required penetration, except for piles jacked into position for underpinning. The allowable capacity of each permanent underpinning pile shall not exceed the larger of the following values: 2/3 of the total jacking force used to obtain the required penetration if the load is held constant for 7 hours without measurable settlement; or 1/2 of the total jacking force at final penetration if the load is held for a period of 1 hour without measurable settlement. The jacking resistance used to determine the working load shall not include the resistance offered by nonbearing soils, soils which are to be excavated or soils where support will dissipate with time.