LATERAL PLATE TESTS ON DRY NCEL TEST SAND,
Abstract
A series of lateral-plate tests was performed in NCEL test sand for the purpose of determining the variation of the coefficient of horizontal subgrade reaction, k sub h, with overburden pressure and deflection. The test procedure consisted of applying a static overburden pressure to the surface of sand while slowly forcing a 9.75-inch diameter circular plate horizontally through the soil and recording the corresponding loads and deflections of the plate. Seven tests were performed at overburden pressures from 1 to 16 psi. The magnitude of k sub h was seen to decrease exponentially with plate deflection, d, and to increase exponentially with overburden pressure, p sub s; however, above an overburden pressure of 8 psi, the region of interest in buried structure design, the variation of k sub h with p sub s became approximately linear. In conjunction with these tests, studies were made which indicated that (1) the coefficient of earth pressure at rest, K, decreased with increasing overburden pressure, approaching a value of 0.38 degrees; (2) there was approximately a 40 percent reduction in horizontal pressure on the plate due to soil arching associated with slight inward movement of the plate compared to the case in which no movement was allowed; and (3) vibration of the soil surface during backfilling caused the at rest horizontal pressure on the plate to increase by nearly a factor of four times that which occurred when the soil was shoveled into place. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1964
- Accession Number
- AD0454265
Entities
People
- H. L. Gill
- T. R. Kretschmer
Organizations
- Naval Facilities Engineering Service Center