Pile mattresses are an option to prevent settlement by founding the road on piles. From the classic concrete bins on wooden piles, to today's pile mattress systems.
The N210
Back in the 1930s, the N210 through Krimpenerwaard had been constructed on a classic mattress foundation of concrete tubs on wooden piles; designed at the time by the nestor of Dutch soil mechanics: Keverling Buisman. After 70 years, the road was in need of renewal in 2006 due to ever-increasing loads. The N210 now rests on a contemporary pile mattress system.
Analytical model for pile mattress (2013)
This scientific publication describes a new model for calculating the arch action in pile mattresses. Among other things, the model explains field observations of load distribution over geosynthetic reinforcement. The model also clarifies how arcing action increases with subsoil settlement.
Geokunst - Pile Mattress Tests (2011-2012)
Geokunst (part of Vakblad Geotechniek) published a series of articles in 2011-2012 on pile mattress tests carried out by Deltares in cooperation with four geosynthetic suppliers. The measurement results from the laboratory setup were compared with the design guideline of CUR226. The conclusions of the tests may lead to cheaper pile mattresses.
Design guideline pile mattress systems (2010)
After an overview of the requirements and starting points for the structure as a whole, this CUR-226 guideline deals successively with the design of the pile foundation, the design of the mattress with the geosynthetic reinforcement, the execution and the management and maintenance.
The guideline contains as many practical instructions for the design as possible, based on literature studies of foreign guidelines and theses as well as extensive 2D and 3D finite element calculations. The results of these calculations have been compared with measurement results from realised projects. Partly on this basis, the German guideline EBGEO has been broadly adopted for the reinforced mattress.
The publication consists of two parts, namely the actual guideline in the main report and a comprehensive appendix report on CD with example calculations, considerations and background of calculations and calculation methods. The design guideline stems partly from Delft Cluster's'work package Pile Mattress Systems'. In addition, an article about the guideline was published in Geotechniek during its development.
Delft Cluster: Integral models for flat roads (2009)
An attempt was made within this research project to provide an overview of requirements for pile mattress systems. In addition, insight was gained into the road design process in practice, in relation to the functional requirements for longitudinal and transverse flatness, the various tools and knowledge gaps. The Delft Cluster research programme (2003-2011) was designed to promote the development and dissemination of knowledge for the ground, road and hydraulic engineering sector.
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Related pages
Ground improvement
Ground deformation
Measurement and monitoring
Vibrations
Settlement flow