SLURRY WALLS FOR BART CIVIC CENTER SUBWAY STATION

DEEP EXCAVATIONS IN DIFFICULT GROUND HAVE LONG BEEN AN ENGINEERING CHALLENGE. WITH THE SHARP INCREASE IN MASS RAPID TRANSIT SUBWAY CONSTRUCTION IN URBAN AREAS DURING THE 1960'S, MORE THAN EVER BEFORE DEEP EXCAVATIONS ARE BEING PLANNED AND CARRIED OUT IN DIFFICULT GROUND CONDITIONS. NEW TYPES OF STRUCTURES ARE BEING PROPOSED AND EXECUTED WITH NEW METHODS OF CONSTRUCTION AND IMPROVED GROUND-WATER CONTROL, AND ARE MORE FREQUENTLY BEING MEASURED TO MONITOR PERFORMANCE. GREAT EFFORT IS BEING MADE TO IMPROVE PREDICTION OF LATERAL EARTH PRESSURES. AT THE SAN FRANCISCO CIVIC CENTER STATION IT WAS NECESSARY TO CARRY OUT AN EXCAVATION APPROXIMATELY 700 FT LONG, 60 FT TO 99 FT WIDE, AND UP TO 78 FT DEEP. BECAUSE OF ADJACENT COMPRESSIBLE SOILS AND THE SENSITIVE STRUCTURES AROUND THE EXCAVATION, THE GROUND-WATER LEVEL HAD TO BE MAINTAINED AS NEAR THE PRECONSTRUCTION LEVEL AS POSSIBLE. A CONSTRUCTION METHOD WAS ADOPTED AND COMPREHENSIVE FIELD INVESTIGATIONS WERE CARRIED OUT, WITH LABORATORY TESTS AND ANALYSES TO ASSIST IN PREDICTING THE LATERAL SOIL PRESSURES. CRITERIA FOR STRUCTURAL DESIGN AND CONTROL OF CONSTRUCTION WERE DEVELOPED. THE STRUCTURE WAS INSTRUMENTED AND THE MEASURED DATA WERE EVALUATED AND COMPARED WITH PRECONSTRUCTION ESTIMATES.

  • Supplemental Notes:
    • Vol 97, No SM9, PROC PAPER 8361, PP 1317-1334, 16 FIG,
  • Authors:
    • Thon, J G
    • Harlan, R C
  • Publication Date: 1971-9

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Filing Info

  • Accession Number: 00233213
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 20 1971 12:00AM