oa Civil Engineer in South Africa - A case history of subsidence resulting from mining at considerable depth : technical note

Volume 23, Issue 2
  • ISSN : 0009-7845



A sudden subsidence of the main line railway tracks close to the Johannesburg-Germiston boundary prompted an investigation into the causes and mechanism of the subsidence. The area affected has been undermined in the past, but the movement is unusual in that the mining is at considerable depth. Subsidence has even occurred where the mining depth is in excess of 250 m. Important services traverse the subsiding area, including the four main line tracks, the M2 motorway in a 4 m deep cutting, Main Reef Road and a 1,2 m water main.

'n Skielike sakking van die hoof spoorlyn naby die Johannesburg-Germiston grens het aanleiding gegee tot 'n ondersoek na die oorsake en meganisme van die sakking. Mynbou het in die verlede onder die sakkende gebied plaasgevind maar die oppervlakte bewegings is buitengewoon aangesien mynbou op groot dieptes onder die oppervlakte plaasgevind het. Belangrike dienste wat deur die sakkende gebied beinvloed word sluit die vier hoof spoorlyne, die M2 motorweg, Hoofrifweg en 'n 1,2 m watertonnel in.

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