Basal Reinforced Piled Embankments by Suzanne J.M. van Eekelen, Marijn H.A. Brugman
By Suzanne J.M. van Eekelen, Marijn H.A. Brugman
A basal bolstered piled embankment comprises a strengthened embankment on a pile starting place. The reinforcement contains a number of horizontal layers of geosynthetic reinforcement put in on the base of the embankment.
A basal bolstered piled embankment can be utilized for the development of a highway or a railway whilst a standard development strategy will require an excessive amount of development time, impact weak gadgets within reach or supply an excessive amount of residual payment, making common upkeep necessary.
This publication is a suggestion (CUR226) for the layout of basal strengthened piled embankments. the rule of thumb covers the following topics: a survey of the necessities and the elemental ideas for the constitution as a complete; a few directions for the pile starting place and the pile caps; layout ideas for the embankment with the basal geosynthetic reinforcement; huge calculation examples; finite aspect calculations; development details and administration and upkeep of the piled embankment. the rule of thumb contains many sensible suggestions. The layout guide is predicated on cutting-edge Dutch study, which used to be carried out in cooperation with many researchers from assorted countries.
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Extra info for Basal Reinforced Piled Embankments
If sand is properly compacted, a characteristic value φ′k of at most 35 degrees may be assumed. Thus, in a design where the majority of the arching occurs in sand fill, it is recommended to check the internal friction angle of the sand fill at various densities by means of laboratory tests. Prescriptions and guidelines The granular fill should consist of coarse-grained aggregate of good quality. 5 mm to 0 / 63 or 4 / 63 mm, according to EN13242. 3; • requirements from environmental legislation; • requirements to do with the construction, see Chapter 8; • requirements on compaction.
1. The steps 1 to 3 may be seen as the preliminary design. In these steps, the pile arrangement including pile type and GR strength are determined. Step 4 may be seen as the final design, in which additional calculations are done to determine for example bending moments in the piles, with the help of numerical calculations. The following are considered in this publication: • requirements for the reinforced embankment; • requirements for the piles and pile caps and recommendations for pile and pile cap design; • design of the reinforced embankment, including calculation examples; • evaluation of pile moments with numerical calculations (finite element method, FEM); • transition zones; • construction and maintenance of the piled embankment.
4 and those in Appendix A should be adapted to the locally applicable traffic loads. Fig. 2 Determination of uniformly distributed traffic load This Chapter presents the method for determining the characteristic value of the traffic load p. 1. Determine the traffic intensity (N according to NEN-EN 1991-2 ). 2. Determine the equivalent height Heq over which the load may be distributed. 2) where: Heq the total equivalent layer thickness in m, h1,2;eq the equivalent layer thicknesses for pavement construction layers 1 and 2 respectively in m, h3 the remaining embankment thickness, being H minus the thickness of the pavement construction layers in m, E1,2,3 the dynamic stiffness modulus of the various layer in MPa, where it applies that E3= 200 MPa.