American Society of Civil Engineers


Use of a Line of Piles to Prevent Damages Induced by Tunnel Excavation


by Emilio Bilotta, (Assistant Professor, Department of Hydraulic, Geotechnical and Environmental Engineering, Univ. of Napoli Federico II, Via Claudio 21, 80125 Napoli, Italy.) and Gianpiero Russo, Ph.D., (Associate Professor, Department of Hydraulic, Geotechnical and Environmental Engineering, Univ. of Napoli Federico II (Italy), Via Claudio 21, 80125 Napoli, Italy.)

Journal of Geotechnical and Geoenvironmental Engineering, Vol. 137, No. 3, March 2011, pp. 254-262, (doi:  http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0000426)

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Document type: Journal Paper
Abstract: Buildings founded in proximity to shallow tunnels under construction may be damaged by the ground displacements induced by tunneling. This is a matter of concern for design, and a variety of protective interventions are currently adopted to prevent such damages. Among these, rows of piles or jet-grouting columns are widely diffused. In this paper, the effectiveness of a simple row of piles is computed by means of three-dimensional (3D) finite-element (FE) analyses, thus allowing the investigation of the relationship between performance and some simple geometrical parameters, such as the spacing among the piles. The results of centrifuge tests are reported and used as a benchmark. The potential damage has been quantified in this work, taking into account both the settlement profile and the horizontal strain induced at the ground surface by tunneling. It is shown that although the settlement reduction is significant only for very small spacing (s=2–3 pile diameters), even largely spaced piles (s=5–6 pile diameters) are useful to prevent damage to buildings because of the significant reduction of the average horizontal strain.


ASCE Subject Headings:
Damage
Excavation
Piles
Settlement
Tunnels

Author Keywords:
Tunnels
Piles
Excavation
Settlement
Damage
Protective structures