Dear Jeff
Mineshafts are owned by the Coal Authority if mined for coal, if mineral
shafts then they are generally owned by the landowner or possibly the
mineral rights owner.
The Coal Commission must give permission for any capping/grouting etc.
Any drilling into shafts or coal seams must be by licence from the Coal
Authority and the consultant contractor or client must take liability.
It was always difficult to get permission to actually construct over a
shaft although we have negotiated it in the past. We wrote our own
specification and I am not aware of any suitable published spec. There
is CIRIA Special Publication 32 "Construction over abandoneded mine
workings 1984" which is good regarding general grouting of workings but
does not adress treatment to construct over a shaft.
Typically you need to find the shaft records and ensure you drill the
entire infill column, pressure grout any voids in and around the shaft
and finally design a suitable shaft cap to take suction if the shaft
fill was sucked out by further collapse. The foundation design must take
the cap location into account. There is also the issue of mine gas which
is to some extent addressed with pressure grouting but needs
consideration in the foundation/slab design.
Hoping that helps
Nigel Robinson
-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Jeff
Roberts
Sent: 26 May 2010 12:36
To: [log in to unmask]
Subject: Mine shafts
Hi all,
Does anyone one have any examples or related guidance for the
development of buildings over the top of old mine shafts? This can
include engineering solutions etc.
Any help would be most appreciated.
Regards
Jeff
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