PREDICTION OF GROUND SETTLEMENTS ASSOCIATED WITH SHIELD TUNNELLING

There is much uncertainty in estimating ground settlement associated with shield tunnelling due to the complicated interaction between tunnelling methods and soil characteristics. Accordingly, if the shape of the ground settlement could be quantitatively predicted, it would be very effective for the assessment of its influence on the existing structures. The shape of the ground settlement trough can be expressed as the product of the normal distribution function and the error function by introducing a mathematical model. The field observations were also carried out at the four sites of the shield tunnel construction in the metropolitan areas. A model test was carried out in which the settlements of sand layers were measured by x-ray techniques. It was concluded that: (1) the lateral and longitudinal profiles of the ground settlement trough are well fitted with the normal distribution curve and the error function curve, respectively. (2) the parameter which represents the width of settlement is roughly proportional to depth of tunnel and its proportional constant depends upon soil characteristics. (3) in clay the ratio of lost ground is positively correlated with ofs (simple overload factor) defined by construction conditions and soil characteristics. (4) consequently the maximum settlement can be calculated by using these relationships. /TRRL/

  • Availability:
  • Corporate Authors:

    Japanese Society of Soil Mech & Foundation Engrs

    Tokyo,   Japan 
  • Authors:
    • Yoshikoshi, W
    • Watanabe, O
    • Takagi, N
  • Publication Date: 1978-12

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 47-59
  • Serial:
    • SOILS AND FOUNDATIONS
    • Volume: 18
    • Issue Number: 4
    • Publisher: JAPANESE GEOTECHNICAL SOCIETY
    • ISSN: 0038-0806

Subject/Index Terms

Filing Info

  • Accession Number: 00197281
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 28 1979 12:00AM