Evaluation of a compacted bentonite/sand seal for underground waste repository isolation

Akgun H., KOÇKAR M. K., AKTÜRK Ö.

ENVIRONMENTAL GEOLOGY, cilt.50, sa.3, ss.331-337, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 50 Sayı: 3
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1007/s00254-006-0212-6
  • Dergi Adı: ENVIRONMENTAL GEOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.331-337
  • Anahtar Kelimeler: bentonite, sand mixture, compaction, hydraulic conductivity, seal design, shear strength, shear stress, factor of safety (F), underground waste repository sealing, PLUGS, CLAY
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

This study investigates the performance of an optimum compacted bentonite/sand mixture seal for the isolation of underground waste repositories. Engineering geological tests such as compaction, flow, swelling, mechanical and shear strength tests have been conducted to select an optimum mixture and to recommend a stable bentonite/sand seal length-to-radius ratio (L/a) as far as the factor of safety (F) is concerned. The results of the compaction permeameter tests led to a recommendation to select an optimum compacted bentonite/sand mixture possessing a bentonite content of about 20% to satisfy the minimum regulatory hydraulic conductivity requirement. Engineering geological analysis of the seal/rock mechanical interaction with regard to reduce the possibility of seal slip led to a recommendation to utilize a seal L/a of at least 25.