LATERAL-PLATE TESTS WITH PLATE DIAMETER VARIED.
Interim rept. for Aug-Oct 64,
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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To further the understanding of the mechanics of soil resistance to horizontal loading, a series of lateral-plate bearing tests was performed in the pit of the NCEL atomicblast simulator. These tests were a continuation of an earlier test program which considered one plate diameter in one type of soil during this series of tests, three plate diameters were used, and the results were compared with data from previous tests. In addition, one test was performed with a different type of soil in an attempt to generalize the applicability of the test results. To simulate a variation in the depth of burial of the plate, overburden pressures were applied to the soil surface by a pneumatic bag. Included in the information gained from this series of tests was the fact that the coefficient of horizontal subgrade reaction, k sub h, decreased exponentially with increasing plate deflection and increased exponentially with increasing overburden pressure for all plate diameters. In addition, it was found that plate deflection at a given level of unit load on the plate did not vary directly with plate diameter as has been previously assumed, but was directly proportional to the 1.35 power of plate diameter. In other words, although k sub h increases with increasing overburden pressure and decreases with increasing plate deflection for all plate diameters considered, at a given level of pressure on the plate, k sub h was found to be inversely proportional to plate diameter raised to the 1.35 power. Author