Subsidence at Matlock Bath War Memorial Site


Following a survey of Matlock Bath War Memorial Site foundations, we found ground conditions at a depth of 1.9 meters to be soft un-compacted soil, easily dug out with high tree root content.

Our trial injection with dyes at two locations approximately 4.5 below ground level demonstrated that there were voids intersected at 2.7 and 3.3 meters with post injection probes showing material transport through the grit stone retaining wall, almost immediately upon commencing the injection procedure at 2.7 and 3.3 intersections, this indicated washout from loose deposits behind the retaining wall likely to be when the river was flowing at high levels.

Approximately 140 kilos of dye were injected representing about 0.75m³ of potential resin to be injected to each location with a target minimum bearing capacity of 262kN/m² to stabilise and consolidate the loose under-laying soils from further wash out subsidence.

We determined that the rear corner of the building foundations had been affected by two factors.

Our trial digs revealed high tree root activity causing localised subsidence and cracked masonry still visible on the external and internal walls. Loose un-compacted soils washed out behind the retaining wall likely caused from the river at high flow during the winter months.

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