Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

The building of the Military Club is one of the most beautiful architectural monuments within the Bulgarian capital of Sofia. Construction of the club in a New Renaissance style and was initiated in 1895 according to the draft of Antonin Kolar, the famous Czech architect. It was completed in 1907 by Nikola Lazarov, a no less famous Bulgarian architect. Thereafter, a long series of cultural events, important for Bulgarian history were held on in Sofia Military Club. The building is a brick structure with three floors and a basement. Foundations are made out of massive stone blocks on the clay. The building is located in the heel of a slight slope, near the highest point of the city at the intersection of Boulevard "Tsar Liberator" and "Georgy Rakovsky" Street. During the period between 2006 and 2008, a tunnel for Sofia subway route was built diagonally under the intersection of the two streets at depth of about 20m. A deep shaft control between tunnel and ground, surrounded by diaphragm walls was constructed about 10 m aside, in front of the building. Ground is multi-layered, including sand aquifer above in silt and plastic clay. During the construction of diaphragm walls of the trench, a drain effect quickly formed a very steep curve depression between the building and the shaft. The rapid decline and great amplitudes of the groundwater level resulted in adverse settlement of the foundation under the front facade and arches on the facade of the building are cracking, fissures are dissolving, and a real danger for the stability of the structure occurred. After the examinations, a micro injection with micro piles is performed along the contour of the building facade. The achievements of technology helped to achieve a high pressure injection into the solution and foundation to be slightly lifted, and cracks in the arches and columns to close.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Restoration of the Military Club Building in Sofia, By Micro Pile Injections

Chicago, Illinois

The building of the Military Club is one of the most beautiful architectural monuments within the Bulgarian capital of Sofia. Construction of the club in a New Renaissance style and was initiated in 1895 according to the draft of Antonin Kolar, the famous Czech architect. It was completed in 1907 by Nikola Lazarov, a no less famous Bulgarian architect. Thereafter, a long series of cultural events, important for Bulgarian history were held on in Sofia Military Club. The building is a brick structure with three floors and a basement. Foundations are made out of massive stone blocks on the clay. The building is located in the heel of a slight slope, near the highest point of the city at the intersection of Boulevard "Tsar Liberator" and "Georgy Rakovsky" Street. During the period between 2006 and 2008, a tunnel for Sofia subway route was built diagonally under the intersection of the two streets at depth of about 20m. A deep shaft control between tunnel and ground, surrounded by diaphragm walls was constructed about 10 m aside, in front of the building. Ground is multi-layered, including sand aquifer above in silt and plastic clay. During the construction of diaphragm walls of the trench, a drain effect quickly formed a very steep curve depression between the building and the shaft. The rapid decline and great amplitudes of the groundwater level resulted in adverse settlement of the foundation under the front facade and arches on the facade of the building are cracking, fissures are dissolving, and a real danger for the stability of the structure occurred. After the examinations, a micro injection with micro piles is performed along the contour of the building facade. The achievements of technology helped to achieve a high pressure injection into the solution and foundation to be slightly lifted, and cracks in the arches and columns to close.