In situ and laboratory investigation of dynamic performance of a cement-stabilised Chalk trial embankment
In situ and laboratory investigation of dynamic performance of a cement-stabilised Chalk trial embankment
Use of stabilised soils in the construction of high-speed rail embankments is a desirable engineering solution as more site-won soils may be used locally thus reducing the volume and mass haul of imported and site-won materials. In the south of contract area C23, significant volumes of weathered structureless chalk will become available due to the construction of cuttings. However, presently there is little data available in the public domain to characterise the dynamic performance of a cement-stabilised chalk for use as high-speed rail embankment fill material. This paper presents the results of a field trial comprising in situ and laboratory testing of a large embankment constructed from three different chalk-cement mixes. By controlling pulverisation, stabilisation, and compaction procedures during construction, the observed variability of material grading, air voids, and density are presented in relation to the natural variation of the chalk, moisture content, added cement content, and stiffness of the supporting foundation. EV2 modulus values are shown to meet HS2 performance requirements but are highly sensitive to cement curing time. On the other hand, the Rayleigh wave characteristics are found to exceed HS2 criteria and the assumed shear value velocity for engineered fill, providing the justification for an increased value to be recommended for optimisation and efficiency.
O. Boumendjel-Game; M. Vowles; M. Fleetwood; Haris Saroglou; Georgios Katsigiannis
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
D - Current and new construction methods
Contact Information
- Secretary General - Dr A M McNamara
- Email: [email protected]
- Phone: +44 20 7040 8154
- City, University of London
- Northampton Square
- London EC1V 0HB. United Kingdom