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Title: Overview for design of foundations on expansive soils
Authors: Johnson, Lawrence D.
Keywords: Clays
Foundation design
Soil mechanics
Expansive clays
Soil swelling
Expansive soils
Structural design
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; GL-79-21.
Description: Miscellaneous Paper
Abstract: Numerous structures constructed on expansive clay soil have experienced and sustained significant damage from differential heave and settlement. The types of structures most often damaged from heaving soil include highways, foundations and walls of residential and light commercial buildings, canal and reservoir linings, and retaining walls. The leading cause of foundation heave or settlement is change in soil moisture attributed to change in the field environment (e.g., climatic changes, prevention of evaporation beneath covered areas, improper drainage following construction and from usage requirements of the structure. The design process for structures on expansive clay should consist of a feasibility study, preliminary design phase to establish the overall concept, and a detailed design phase to complete the engineering description of the project. This report provides background information for establishing the preliminary design of structures in swelling soil areas based on field studies conducted by the U.S. Army Engineer Waterways Experiment Station (WES) and experiences of numerous investigators. The overview includes analyses of site and soil investigations, topography and landscaping including drainage and soil stabilization techniques, and selection of the foundation and superstructure. General suggestions for remedial repair of existing structures are also provided . Analyses of the movement of cast-in-place concrete piers in swelling soil are included to provide a basis for design of these foundations. Appendix A presents a determination of soil suction by thermocouple psychrometers. Suggestions for repair of structures (remedial measures) are presented in Appendix B. Prediction of pier movement is discussed in Appendix C. Appendix D is a notation of symbols used in the report.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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