Long-term behaviour of waterproofing systems for cut-and-cover tunnels (LABSY) (Continuation of FA 91/98; AGB1998/106); AGB1998/202
Overview
Background & policy context:
In Project LABSY 1, 23 constructions built between 1970 -2000 were tested for their tightness over the period 1999-2000. For this, the sealing system was divided into 6 classes of materials: sealing materials made of bitumen, polymer-bitumen, plastics loose and bonded, liquid plastic, waterproof concrete and reactive bentonite. In a first evaluation of the tightness class 1 and 2 was distinguished whether the tunnel is leaking or not. 10 objects were leaking, 6 of which are to be checked. The causes of the leak were divided and assigned due to be provided for filing in 5 main groups and 18 defects categories.
The most important data are summarized in a detailed report. From each object the complete records were stored in a database, which also includes the most important photo material.
The LABSY 2 project is an extension of LABSY 1 project, which is the technical basis.
In the new LABSY 2 project the 6 categories of materials are numerically enhanced so that they are represented statically. General findings for the sealing of these constructions will be derived from the entire dataset.
Objectives:
Form the basis for the in-depth investigation of new sealing techniques such as liquid plastics and clay liners. The recommendations shall include new standards for achieving the tightness. For equivalent statistical support the findings of all material categories should be expanded to at least 8 objects.
Methodology:
Applied statistics on an extended database of road structures in Switzerland.
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