The development comprised the construction of 185 residential units including access roads and domestic gardens. The site is geologically complex, comprising a variable thickness of made ground and variable Head deposits overlying Thanet Formation and White Chalk Subgroup.
The initial ground investigations found that the Head deposits were variable in consistency across the site, becoming soft/ loose over the south eastern quadrant of the site. In addition, significant thickness of made ground were present across parts of the site.
A Phase III investigation was carried out to provide geotechnical parameters for piled foundations, determine the extent of the deep made ground and zone the site with respect to potential foundation options, dependent on the condition of the underlying soils.
Additional works that have been carried out include:
- the construction of 4 No. deep borehole soakaways within the underlying structured White Chalk Subgroup;
- comprehensive geoenvironmental assessment of the site and preparation of a Remediation Method Statement;
- ongoing validation of required remediation works with gardens and soft landscaping;
- providing ongoing geotechnical consultancy to assist with queries from Railtrack associated with the impact of the development on the stability of the adjacent railway embankment.
- Providing ongoing verification engineer services to allow planning and warrantor sign off on completion.
Phased ground investigation (desk study, boreholes, trial pits, CPT)
Geotechnical and Geoenvironmental Assessment reports
Dynamic probing around housing footprints to zone foundation requirements
Installation of borehole soakaways
The ground conditions recorded by the intrusive works were found to be variable. A series of close spaced dynamic probes were carried out around the footprint of the proposed houses. Based on the results of the tests it was possible to zone the site for foundation options and to confirm the depth of competent strata ahead of construction. This enabled the client to efficiently and economically design foundations (both spread and piled) suitable for the variable nature of the underlying soils ahead of construction and avoid potentially costly delays during the build programme.
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