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treatment of shallow mine workings - Aarsleff's Drilling & Grouting works in Kenton Bankfoot,
Treatment of shallow mine workings on site for a new housing development.

In December 2018, Aarsleff Ground Engineering were appointed by Taylor Wimpey North East to undertake the treatment of shallow mine workings beneath a previous greenfield site located in Kenton Bankfoot, Newcastle upon Tyne.

The housing development makes up a wider Newcastle City Council plan to build around 800 homes in the Kenton Bankfoot area. The 10-week contract included 20 probe holes to a depth of c.42m in the early stages of the project to gain an initial understanding of the ground conditions prior to targeting specific areas beneath the proposed building footprints and roads.

The site was divided into 5 strategic areas for treatment and drilled on both a 4.25m and 6m grid due to lateral variations in coal workings. The main works included 606 treatment holes drilled to the base of the High Main Seam at c.38m and was carried out using 5 rigs: 2x Boart-Longyear’s, 1 x Klemm 806- 3G, 1 x Klemm 909 and 1 x 26 tonne Volvo JCB excavator. The total grout injected into the coal workings was 1000 tonnes using a comprised mixture of 10:1 Pulverised Fly Ash (PFA), a bi product from coal fired power stations and Ordinary Portland Cement (OPC).

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