Energy storage systems provide storage of electricity from the grid at times of oversupply, and releasing electricity back into the grid at times of peak demand.
We provided characteristic values to support the development of this new energy infrastructure based on published data, empirical relationships, experience, historic and recent investigation which was supplemented by contemporary geophysical testing,
Initial investigation of superficial glacial soils and Coal Measures bedrock did not provide sufficient information to support finite element modelling of large and deep foundation bases. To allow the detailed design to be finalised, wewere developed a strategy to obtain the required information and assess outstanding geotechnical hazards within a limited timeframe.
Our review concluded coal mining subsidence and slope stability risks (including local coal tips) were low. The investigation strategy was therefore focused on providing additional resolution on the Conceptual Ground Model (which was inconsistent based on previous boreholes) and to provide the following specific geotechnical information/parameters:
- Bearing capacity checks for both short and long term operational conditions.
- Poisson’s Ratio.
- Bulk Density.
- Vertical Modulus of Subgrade Reaction.
- Elastic Stiffness.
- Shear Modulus.
Traditional site investigation techniques (e.g. boreholes, SPT testing) had already been utilised and were not favoured due to time constraints and the requirement to provide stiffness parameters at small strain levels. Innovative non-intrusive specialist techniques were utilised with some further shallow excavation to allow confirmation of the ground conditions.
Trial pits confirmed the superficial glacial soils primarily consisted of cobbles and boulders within a finer matrix and it was considered inconsistent shallower bedrock previously noted in some historic rotary boreholes, may have actually represented large sandstone boulders.
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To obtain information at depth, and in partnership with Soil Safe, advanced Continuous Surface Wave (ACSW) testing was utilised. This is a fast, non-intrusive, geophysical technique which measures the ground response to a vibratory source. Shear wave data was collected from across the foundation bases and stiffness profiles were developed.
The calculated values from the geophysics were evaluated relative to published values and derived values calculated using empirical relationships and available in-situ strength data (e.g. SPTs), and characteristic values were provided for the soil at foundation depth (around 5m below the existing ground level).
Prior to foundation construction, we visually inspected the formation and confirmed it was consistent with what was expected. Further non-intrusive verification testing at the formation level (plate load testing and ACSW surveying) certified the parameters provided previously were suitable and that construction could commence.
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Get in touch with our team via our email, enquiries@earthsciencepartnership.com or phone number, 02920 813385 and we’ll be very happy to help with and discuss any geotechnical engineering project requirements you may have.
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