scholarly journals SYSTEMATIC AERIAL PHOTO ANALYSIS OF SOFT GROUND CONDITIONS

1968 ◽  
Vol 41 (1) ◽  
pp. 19-38 ◽  
Author(s):  
Hiroshi KADOMURA
Keyword(s):  
Soft Ground ◽  
Aerial Photo ◽  
Ground Conditions

Volume 13 Issue 2 Editorial Note

2019 ◽  
Vol 13 (2) ◽  
Author(s):  
Anne Lemnitzer
Keyword(s):  
Case Studies ◽  
Editorial Note ◽  
Soft Ground ◽  
Research Papers ◽  
Foundation Construction ◽  
Ground Conditions

We are excited to present the work of five excellent author groups who prepared the research papers and case studies featured in this Issue. Three of the five papers deal with piles and the remaining two papers involve foundation construction on soft ground conditions.

New Techniques in Difficult Ground Tunneling

2000 ◽  
Vol 1740 (1) ◽  
pp. 175-181 ◽  
Author(s):  
Arturo Ressi di Cervia
Keyword(s):  
Traffic Flow ◽  
New Technique ◽  
Soil Conditions ◽  
Soft Ground ◽  
New Techniques ◽  
Tunnel Excavation ◽  
Ground Conditions ◽  
Full Face

The construction of tunnels under soft ground conditions has been solved by the use of special technologies and equipment. This equipment opens new possibilities for the enlargement of existing tunnels while maintaining traffic flow. The work can be done safely and economically even under the most difficult soil conditions. Two new tunneling techniques for the full-face excavation of galleries under difficult ground conditions and one new technique for cut-and-cover tunnel excavation are described.

scholarly journals 3D Modelling of a Tunnel Re-excavation in Soft Ground

10.14311/1378 ◽  
2011 ◽  
Vol 51 (3) ◽  
Author(s):  
M. Hilar
Keyword(s):  
Ground Improvement ◽  
3D Modelling ◽  
Concrete Lining ◽  
Soft Ground ◽  
Tunnel Face ◽  
Technical Problems ◽  
Support Measures ◽  
Geological Conditions ◽  
Ground Conditions ◽  
Additional Support

The construction of the shallow tunnel at Brezno started using the Pre-Vault Method. The tunnel excavation, in complicated geological conditions, led to many difficulties which finally resulted in a collapse, when a significant part of the temporary tunnel lining collapsed. Various options for re-excavating the tunnel were evaluated prior to further construction. Finally a decision was made to separate the collapsed area into sections 9 m in length using 16 m-wide, transversally oriented pile walls, to improve the stability of the collapsed ground. The walls were constructed from the surface prior to excavation. It was also decided to re-excavate a collapsed area using the Sprayed Concrete Lining (SCL) method. Due to problematic soft ground conditions, which had been made even worse by the collapse, some additional support measures had to be considered prior to re-excavation (ground improvement, micropile umbrellas embedded into the pile walls, etc.)This paper describes numerical modelling of the tunnel re-excavation through the collapsed area. Initial calculations of the tunnel re-excavation were made using a 2D finite element method. Subsequently, further calculations to evaluate the rock mass behaviour in the collapsed area were provided in 3D. The 2D calculations were used to provide sensitivity studies, while 3D modelling was mainly used for evaluating the tunnel face stability (impact of the pile walls, impact of ground improvement) together with other factors (length of advances, moment of the temporary invert closure, etc.) The results of the modelling were compared with the monitoring results.The paper also briefly describes the construction experience (technical problems, performance of various support measures, etc.) The excavation and the primary lining construction were completed in 2006, and the tunnel was opened for traffic in April 2007.

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