LOAD CARRYING CHARACTERISTICS OF DRILLED SHAFTS CONSTRUCTED WITH THE AID OF DRILLING FLUIDS

THE RESEARCH INVOLVED FIELD LOAD TESTS OF TWO STRAIGHT TEST SHAFTS CONSTRUCTED BY EMPLOYING DRILLING MUD. BOTH SHAFTS WERE INSTRUMENTED FOR THE MEASUREMENT OF AXIAL LOAD UTILIZING A STRAIN TRANSDUCER. THE SHAFTS WERE TESTED SEVERAL TIMES UNDER AXIAL LOADS AND THE LOAD DISTRIBUTIONS IN THE SHAFTS WERE MEASURED. JUST PRIOR TO CONDUCTING THE LAST TEST, THE UPPER PORTION OF THE SOIL AROUND EACH SHAFT WAS EXCAVATED PROVIDING AN OPPORTUNITY FOR A VISUAL EXAMINATIN OF THE SHAFTS. THE STUDY PRESENTED IS CONCERNED MAINLY WITH THE CONSTRUCTION, INSTRUMENTATION AND TESTING OF ONE OF THE TWO SHAFTS. THIS TEST SHAFT WAS 36 INCHES IN DIAMETER WITH THE BASE LOCATED 60 FEET BELOW THE GROUND SURFACE. THE SHAFT WAS TESTED A TOTAL OF SEVEN TIMES UTILIZING VARIOUS TESTING PROCEDURES. THE MAXIMUM APPLIED LOAD WAS 832 TONS. THE SOIL AT THE TEST SITE CONSISTED OF A LAYERED SYSTEM OF SAND, SILT, AND CLAY. THE TEST RESULTS FROM THIS SHAFT PROVIDE A BASIS FOR A DISCUSSION OF SOIL-SHAFT INTERACTION, INTERACTION BETWEEN SOIL LAYERS; AND THE EFFECTS OF DRILLING MUD, RELOADING, END CONDITIONS AND SOIL PROPERTIES ON THE LOAD TRANSFER WHICH WAS DEVELOPED. CONSTANT MONITORING OF THE INSTRUMENTATION GAVE DATA ON THE STABILITY AND RELIABILITY OF THE INSTRUMENTATION SYSTEM AND ON THE ACTION OF THE CONCRETE DURING THE CURING PROCESS. THE EXAMINATION OF BOTH TEST SHAFTS ILLUSTRATED THE CONTRASTING RESULTS OF THE CONSTRUCTION UTILIZING DRILLING MUD. THE PROCEDURE FOR SHAFT CONSTRUCTION AND THE DANGERS INVOLVED IN THE CONSTRUCTION ARE DISCUSSED. SUGGESTED METHODS TO AVOID THE DANGERS OF CONSTRUCTION ARE GIVEN. AN ANALYSIS OF THE TEST SHAFT WAS MADE USING EMPIRICAL LOAD TRANSFER DATA DEVELOPED FROM BASIC SOIL PROPERTIES CAN BE USED IN PREDICTING THE BEHAVIOR OF DRILLED SHAFTS. /AUTHOR/

  • Supplemental Notes:
    • Rr No 89-9, 339 PP, 51 IFG, 6 TAB, 6 PHOT, 30 REF, 5 APP
  • Corporate Authors:

    University of Texas, Austin

    Center for Highway Research, 200 West 21st Street
    Austin, TX  United States  78712
  • Authors:
    • Barker, W R
    • Reese, L C
  • Publication Date: 1970-8

Subject/Index Terms

Filing Info

  • Accession Number: 00236310
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 24 1972 12:00AM