MEMBRANES AND ENCAPSULATION OF SOILS FOR CONTROL OF SWELLING

THE ADVANTAGES OF PEVENTING THE ENTRANCE OF MOISTURE FROM ABOVE OR BELOW A LAYER OF SOIL ARE OBVIOUS TO DESIGNER AND CONSTRUCTION ENGINEERS ALIKE. ONE PROCEDURE USED IN AN ATTEMPT TO SEAL OUT MOISTURE INVOLVES THE TECHNIQUE OF PLACING IMPERVIOUS MEMBRANES BETWEEN THE SOIL LAYER AND POSSIBLE SOURCES OF MOISTURE. PREVIOUSLY, THE MAJOR DRAWBACK TO EXTENSIVE EMPLOYMENT OF SUCH CONSTRUCTION TECHNIQUES HAS BEEN EITHER THE LACK OF INTEGRITY OF LOW-COST MEMBRANE MATERIALS OR THE RELATIVELY HIGH COST OF MEMBRANE MATERIALS HAVING BETTER DURABILITY TRAITS. HOWEVER, RECENT WORK COMPLETED BY THE U. S. ARLMY ENGINEER WATERWAYS EXPERIMENT STATION HAS DEVELOPED A DURABLE, INEXPENSIVE COMBINATION OF MEMBRANES AND PROPER CONSTRUCTION TECHNIQUES, WHICH TOGETHER OVERCOME THE PAST RESTRICTIONS FOR USE OF MEMBRANE WATERPROOFING. THIS REPORT DESCRIBES A MEMBRANE- ENVELOPED SOIL LAYER (MESL) SYSTEM. IT CONSISTS OF A SUBGRADE UPON WHICH A FOUNDATION LAYER OF COMPACTED SOIL (CONSTRUCTED FROM NATURAL SUBGRADE OR LOCALLY AVAILABLE SOIL) LIES BETWEEN A LOWER AND UPPER WATERPROOF MMBRANE. THE MEMBRANES ARE JOINTED AND SEALED ALONG THE EDGES, FORMING A WATERPROOF ENCAPSULATED SOIL SYSTEM. FOLLOWING A BRIEF DISCUSSION OF MATERIALS DEVELOPMENT, THE CONSTRUCTION TECHNIQUE FOR SUCCESSFUL INSTALLATION OF A MESAL SYSTEM IS PRESENTED. RESULTS OF STRUCTURAL AND COST ANALYSIS STUDIES ARE GIVEN AND THE LIMITATIONS OF THE SYSTEM ARE POINTED OUT. BRIEF MENTION IS MADE OF AN ALTERNATE CONSTRUCTION PROCEDURE WHICH IS CURRENTLY BEING INVESTIGATED.

  • Supplemental Notes:
    • Proceedings, Workshop on Expansive Clays and Shales in Highway Design and Construction, Denver, Colorado, 1972. Available in 2 volumes from NTIS, PB-225842.
  • Corporate Authors:

    University of Wyoming, Laramie

    Wyoming Survey and Analysis Center, 710 Garfield
    Laramie, WY  USA  82070
  • Authors:
    • Hammitt, G M
    • Ahlvin, R G
  • Publication Date: 1973-5

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00233509
  • Record Type: Publication
  • Report/Paper Numbers: Workshop Proceedings
  • Files: TRIS
  • Created Date: Jul 31 1977 12:00AM