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Article
Author(s)
Ampeglio D. Garini
Full-Text PDF XML 571 Views
DOI:10.17265/1934-7359/2019.05.003
Affiliation(s)
Consulting Engineer, Genoa 16044,Italy
ABSTRACT
In the recent literature concerning the multi-propped bottom-up technique Shanghai
Metro Stations Excavations, there is evidence of the importance of the
disturbance in terms of greater wall horizontal deflections and consequently
vertical settlements in the neighbouring, caused by the late long time of open
-cut excavation without propping.Here is proposed, theoretical and pragmatic at
the same time, a new approach to face the problem of the wall deflections and
the related vertical settlements behind the wall. The solution proposed is
indeed to impede any formation of the incipient sliding in the active wedge
soil rupture surface, by oblique piling crossing over the rupture surface
through a longer pile penetration length in relation to the active wedge before
any excavation process starts. This
piled-construction will then cut to shape the excavation profiles recurring to
loss of piles material.This solution is particularly fit for high seismicity
prone areas, because of the minor relative loss of per unit length of pile, caused by the greater
depth of the rupture surfaces to get and cross over.
KEYWORDS
Active wedge, bottom-up technique, horizontal deflections, vertical excavation, vertical settlements, metro stations, flexible walls.
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