The substantial increase of the water table level observed in the urban area of Milan (northern Italy) during the past years led to the flooding of various underground facilities and, in particular, of some subway tunnels. In fact, they were built during the seventies, and in the early eighties, without a proper waterproofing because of the low level of the water table at that time. As a consequence, the Milan Metro (Metropolitana Milanese) decided to carry out a series of technical investigations to evaluate the possible provisions able to eliminate this problem. Here, as a part of the mentioned investigation, an experimental and numerical study is presented concerning the low pressure grouting of granular soils, through silicate solutions, to drastically reduce their "natural" permeability. First, the numerical treatment of the grouting process is outlined. Then, the experimental part of the study is summarized, which aims at providing an insight into the variation of permeability during the grouting process. Finally, on the basis of a series of numerical simulations, some conclusions are drawn on the effectiveness of the proposed provision.
A study of low pressure grouting of granular soil
CIVIDINI, ANNAMARIA
2000-01-01
Abstract
The substantial increase of the water table level observed in the urban area of Milan (northern Italy) during the past years led to the flooding of various underground facilities and, in particular, of some subway tunnels. In fact, they were built during the seventies, and in the early eighties, without a proper waterproofing because of the low level of the water table at that time. As a consequence, the Milan Metro (Metropolitana Milanese) decided to carry out a series of technical investigations to evaluate the possible provisions able to eliminate this problem. Here, as a part of the mentioned investigation, an experimental and numerical study is presented concerning the low pressure grouting of granular soils, through silicate solutions, to drastically reduce their "natural" permeability. First, the numerical treatment of the grouting process is outlined. Then, the experimental part of the study is summarized, which aims at providing an insight into the variation of permeability during the grouting process. Finally, on the basis of a series of numerical simulations, some conclusions are drawn on the effectiveness of the proposed provision.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
