Role of engineering geology investigations in deep excavations

• Malekzade Zaman

  Department of Geology, Payame Noor University

抄録

In congested urban area it is common to do excavation several meters lower than ground surface to have sufficient space for car parking and electromechanical facilities. Excavation is one of hazardous tasks in the context of civil engineering activities. Geotechnical assessments coupled with engineering geology explorations play important role in reducing hazards associated with excavation. In these excavation works, especially in megacities, concentration on engineering geology aspects of the sites is usually at least or ignored. That is, geological features of the site in addition to the geotechnical properties have to be studied. On the basis of observations, between different case studies, and in one of excavations, this paper presents documented problems encountered governing by presence of a large fault zone. Of these problems are uncontrolled deformation in some parts of the retaining wall and its consequent to damage neighboring buildings, local uprising water table and its effect on the internal and external slope stability. This case study has been done on hard soils that faulting has generated a wide crushed zone with tight fault planes. In this case, it is advised to consider these weak planes in modeling when engineers want to evaluate slope stability safety factor by limit equilibrium analysis and/or calculation of deformation due to excavation by finite element method. These collaborations have to be continued along the excavation implementation because, in these cases, supports with sufficient capacity with the slot excavation (sequential excavation dictated by soil conditions) are needed. That is, two disciplines of geotechnical engineering and engineering geology should support together properly. Therefore, I selected one of problematic project in that there was not such reconciliation between geotechnical and geological data thereby it experienced damage from these defects.

収録刊行物

• Japanese Geotechnical Society Special Publication

  Japanese Geotechnical Society Special Publication 2 (76), 2610-2615, 2016

  公益社団法人 地盤工学会

キーワード

• engineering geology
• excavation, fault
• fault

詳細情報

• CRID: 1390282680739936256
• NII論文ID: 130005124332
• DOI: 10.3208/jgssp.irn-18
• ISSN: 21888027
• Web Site: https://www.jstage.jst.go.jp/article/jgssp/2/76/2_IRN-18/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可