Failure Analysis of an Intersection under Squeezing Rock Conditions


ÖZTÜRK H., Foo B.

EUROCK 2021 Conference on Rock Mechanics and Rock Engineering from Theory to Practice, Turin, Virtual, Italy, 20 - 25 September 2021, vol.833 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 833
  • Doi Number: 10.1088/1755-1315/833/1/012133
  • City: Turin, Virtual
  • Country: Italy
  • Middle East Technical University Affiliated: Yes

Abstract

© Published under licence by IOP Publishing Ltd.The development of Turkey's deepest coal mine is currently underway to the proposed depth of 1200 meters (m) below surface at the Soma Coal Basin. An 11 m intersection forming an access way from one of the main declines was excavated at approximately 900 m below surface collapse within hours of completion even after being heavily supported by TH34 and cable bolts. It was discovered during the excavation failure investigation and rehabilitation work that the intersection was excavated below a water bearing stratification and faulted zone of the coal seam. The failure analyses concluded that the failure was contributed by a number of factors, mainly the overburden pressure of the overlying material along with the inrush of high-pressured groundwater with the very poor rock mass surrounding the excavation. This study investigates the possible reasons of the failure, numerical modelling of the intersection and alternative support suggestions for such squeezing rock conditions.