EARTH PRESSURE REDUCTION IN FRONT OF A TUNNEL SHIELD

THE EARTH PRESSURE IN FRONT OF A TUNNEL SHIELD IS CONSIDERABLY REDUCED EVEN IN NON-COHESIVE STRATA BY THREE-DIMENSIONAL ARCHING PHENOMENA WITHOUT ANY SOLID BODY SLIDING IN THE INTERIOR OF THE SOIL MASS. ARCHING CAN BE EXPLAINED IN TERMS OF A GENERAL SOLUTION OF THE DIFFERENTIAL EQUATIONS IF STATIC EQUILIBRIUM. THE LATERAL STRESS REDUCTION DEPENDS ON THE FAILURE CRITERION AND THE STATE OF STRESS AT REST. IT DEPENDS REMARKABLY ON PRESTRESS CONDITIONS WHICH ARE SIGNIFICANT FOR GLACIAL DEPOSITS. THESE CONDITIONS ARE DISCUSSED FOR SAND. THE EARTH PRESSURE REDUCTION IS EVALUATED AND COMPARED WITH CURRENT TUNNEL LINING PRACTICE IN HAMBURG. COMPUTED SAFETY MARGINS ARE CONSIDERED SUFFICIENT TO AVOID UNDESIRABLE SURFACE SETTLEMENT. /RRL/

• Supplemental Notes:
  • pp 473-481, 11 FIG, 7 REF
• Authors:
  • Smoltczyk, U
• Conference:
  • Soil Mech & Fdn Eng Conf Proc /Mexico/
• Publication Date: 0

Media Info

• Serial:
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Earth pressure; Sand; Soil arching; Tunnel lining; Tunnel shields; Tunnels
• Uncontrolled Terms: Lateral stress
• Old TRIS Terms: Shields (Tunneling)
• Subject Areas: Bridges and other structures; Geotechnology; Highways;

Filing Info

• Accession Number: 00232211
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS
• Created Date: Apr 10 1971 12:00AM