Accession Number : AD0761084

Title :   Properties of Expansive Clay Soils. Report 1. Jackson Field Test Section Study,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Johnson,Lawrence D.

Report Date : MAY 1973

Pagination or Media Count : 87

Abstract : Differential swelling and shrinkage of foundation soils are responsible for considerable damages to buildings and other structures in many parts of the world. One of these regions is in Jackson, Mississippi, and the surrounding area, where many types of structures have been damaged from movements of the underlying Yazoo clay formation. Field test sections, each containing an instrumented 100-ft-square area covered with an impermeable material simulating a lightweight structure, have been planned for five regions. The first test section was constructed near Jackson in October 1969 in an area underlain by the Yazoo clay formation. Results of field and laboratory investigations conducted prior to construction were used to estimate the amount of heave anticipated in the test area. The climate at Jackson is warm and humid. The test section was constructed on a moist soil profile. Negative pore water pressures of about 1 ton/sq ft have been measured in the laboratory in undisturbed samples of Yazoo clay. Accumulative heave of less than 0.04 ft measured during 1-1/4 years of observations shows a pattern of very slow change that may require years before the maximum heave is developed. (Author)

Descriptors :   (*CLAY, STABILITY), (*FOUNDATIONS(STRUCTURES), SOILS), (*STRUCTURES, MISSISSIPPI), SHRINKAGE, MOTION, ENGINEERING GEOLOGY, CONSTRUCTION, MOISTURE, DEFORMATION, HUMIDITY

Subject Categories : Soil Mechanics
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE