Location

Arlington, Virginia

Date

14 Aug 2008, 2:15pm - 4:00pm

Abstract

The underground facilities in loess in Bulgaria have a long history. The loess represents one of the best studied geological formations, its stratigraphic and engineering geological properties being well explored. It is characterized by a thick aeration zone, reaching up to 80-100 m. After the depth of 3-4 m from the surface, low humidity and constant temperature (15-160) are maintained in it. The composition of sandy and silty loess, is dominated by quartz, while the clayey fraction contains high amount of Са2+, which determines the relatively low hydrophilicity. Moreover, loess is easily excavated, keeps vertical slopes and unsupported arches. Loess with natural water content possesses satisfactory strength and bearing capacity. The main disadvantage is its collapsibility, which can be overcome. The paper considers the experience of exploitation of different underground facilities and the damages observed in it. Under the circumstances of the emerging shortage of inexpensive energy, it might be useful to carry out more detailed geotechnical and geotechnological investigations for the wider utilization of loess for underground construction.

Department(s)

Civil, Architectural and Environmental Engineering

Meeting Name

6th Conference of the International Conference on Case Histories in Geotechnical Engineering

Publisher

Missouri University of Science and Technology

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Underground Facilities in Loess

Arlington, Virginia

The underground facilities in loess in Bulgaria have a long history. The loess represents one of the best studied geological formations, its stratigraphic and engineering geological properties being well explored. It is characterized by a thick aeration zone, reaching up to 80-100 m. After the depth of 3-4 m from the surface, low humidity and constant temperature (15-160) are maintained in it. The composition of sandy and silty loess, is dominated by quartz, while the clayey fraction contains high amount of Са2+, which determines the relatively low hydrophilicity. Moreover, loess is easily excavated, keeps vertical slopes and unsupported arches. Loess with natural water content possesses satisfactory strength and bearing capacity. The main disadvantage is its collapsibility, which can be overcome. The paper considers the experience of exploitation of different underground facilities and the damages observed in it. Under the circumstances of the emerging shortage of inexpensive energy, it might be useful to carry out more detailed geotechnical and geotechnological investigations for the wider utilization of loess for underground construction.