Thames Water Bore holes in Upland Road

[reddinggirl]

Does anyone remember Thames water putting down bore holes as part of the London Ring Extension? I think there was one on Upland Road near Piermont Road sometime in the last 5 years, but I can't remember when. It would be really handy to know!

thanks

[Ridgley]

Is that what they are also doing near the roundabout on Goose Green?

[Chener Books]

A high level view of the reason for the Upland Road borehole is here>

"Thames Water Ring Main AMP4 London Resilience Programme

The geology to be encountered by the tunnels for these projects is highly variable. The Brixton to Honor Oak tunnel will encounter the Woolwich and Reading Beds, Upnor Formation, Thanet Sands and Chalk. It will also cross the major Wimbledon Fault. The extension will be lined with a 2.9m ID single pass segmental lining. Each shaft is between 55.0m ? 60.m deep and will be sunk by dry caisson jacking techniques. The shafts at Brixton and Honor Oak will both be 11.0m internal diameter to house pumps, high integrity valves and delivery pipework connecting to the clean water network distribution."

The purpose of doing the borehole in advance of boring the tunnel would have been to:

[1] Check the depths of the underlying strata:

London Clay

Reading Formation

Woolwich Formation

Upnor Formation

Thanet Sand

White Chalk

In the Upland Road area the London Clay is either a very thin layer or has been totally eroded. Immediately under the made ground, topsoil, or "brick earth" lies the Reading Formation.

[2] Take scientific measurements to plan for future tunnel degredation.

[3] Investigate the uncertain course of the Red Post Hill Fault and check whether the putative East Dulwich Fault was encountered.

John K

[reddinggirl]

thanks john, that's very useful.