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1812.7.3 Rock Socket Design
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The depth of the rock socket in Class 1c rock or better shall be sufficient to develop the full load-bearing capacity of the caisson pile based upon the sum of the allowable bearing pressure on the bottom of the socket in accordance with Table 1806.1 plus an allowable bond stress of 200 psi (1379 kPa) on the sides of the socket. The depth of the socket in Class 1c rock or better below the bottom of the pipe shall not be less than 3 feet (914.4 mm) or the outside diameter of the pipe.
1812.7.3.1 Increased Allowable Bond Stress
Load tests, with instrumentation in the rock socket to demonstrate the transfer of force to the rock, shall be performed to justify the use of bond stresses above 200 psi (1379 kPa). A minimum factor of safety of 2 shall be applied to the ultimate test load where an increase in allowable bond stress is sought. A report summarizing the methods and results of the load test shall be submitted to the commissioner for approval.
1812.7.3.2 Minimum Number of Load Tests
In each area of the foundation site within which the subsurface soil and rock conditions are "substantially similar" in character, as determined by the engineer, at least one load test shall be performed for the largest caisson pile diameter used on a site occupying a total area of 80,000 square feet (7432.2 m2) or less. For sites greater than 80,000 square feet (7432.2 m2), an additional load test shall be performed for every 80,000 square feet (7432.2 m2) of added footprint area.
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