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Grouting of Permanent Intruded Concrete Tunnel Plugs at South Deep Gold Mine, South Africa
The potential closure and subsequent flooding of a neighbouring mine necessitated the construction of a rough parallel intruded concrete plug within each of the tunnels connecting the two mines through a 40m thick boundary rock wall. The paper describes the design and construction of three 30m long tunnel plugs formed in Witwatersrand quartzite to withstand safely highly acidic groundwater at a maximum hydrostatic head of 1500m for 100 years and two 25m long plugs in Ventersdorp lava where the groundwater was neutral at a head of 1250m. For the known rock mass properties, design considerations include grout design for the rock/plug interface and rock mass, mortar design for injection of the preplaced aggregate and associated strength and stiffness properties. For plug construction, each critical element is described, i.e. rock preparation, pre-grouting of rock mass, placement of coarse aggregate, grouting plant, injection procedures and the associated quality controls.
Grouting of Permanent Intruded Concrete Tunnel Plugs at South Deep Gold Mine, South Africa
The potential closure and subsequent flooding of a neighbouring mine necessitated the construction of a rough parallel intruded concrete plug within each of the tunnels connecting the two mines through a 40m thick boundary rock wall. The paper describes the design and construction of three 30m long tunnel plugs formed in Witwatersrand quartzite to withstand safely highly acidic groundwater at a maximum hydrostatic head of 1500m for 100 years and two 25m long plugs in Ventersdorp lava where the groundwater was neutral at a head of 1250m. For the known rock mass properties, design considerations include grout design for the rock/plug interface and rock mass, mortar design for injection of the preplaced aggregate and associated strength and stiffness properties. For plug construction, each critical element is described, i.e. rock preparation, pre-grouting of rock mass, placement of coarse aggregate, grouting plant, injection procedures and the associated quality controls.
Grouting of Permanent Intruded Concrete Tunnel Plugs at South Deep Gold Mine, South Africa
Littlejohn, Stuart (author) / Bruce, Donald A. (author)
Proceedings of the Fourth International Conference on Grouting and Deep Mixing ; 2012 ; New Orleans, Louisiana, United States
Grouting and Deep Mixing 2012 ; 1869-1878
2012-08-17
Conference paper
Electronic Resource
English
Grouting , Highways and roads , Chemical grouting , Anchors , Cement , Cutoffs , Tunnels , Piles , Mixing , Mining , Foundations , South Africa , Hydraulic structures
Grouting of Permanent Intruded Concrete Tunnel Plugs at South Deep Gold Mine, South Africa
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