Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

In the mid-1920s, a 26-room mansion fashioned after a 16th Century Scottish castle, was built south of Denver, Colorado atop a large mesa. Although significant portions of the mesa were capped with a hard, relatively intact conglomerate rock formation, the outer edges were either missing or fractured into blocks and underlain by weaker claystone. Since its construction, portions of the conglomerate capstone have shifted, causing settlement and lateral movement of the outer parts of the residence. As part of recent renovation work, a comprehensive evaluation of foundation conditions was conducted to evaluate the cause of past structural movements and to develop a plan to stabilize the structure. This effort included the delineation of individual portions of conglomerate caprock supporting the structure, characterization of the nature and continuity of underlying soil and rock, and measurement of the direction of structural movements. Following an evaluation of this data, an underpinning program involving the use of micropiles was designed and installed to stabilize the individual conglomerate blocks, and to provide more stable permanent foundation support for the structure.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Stabilization of a Historic Structure Founded on an Unstable Mesa

New York, New York

In the mid-1920s, a 26-room mansion fashioned after a 16th Century Scottish castle, was built south of Denver, Colorado atop a large mesa. Although significant portions of the mesa were capped with a hard, relatively intact conglomerate rock formation, the outer edges were either missing or fractured into blocks and underlain by weaker claystone. Since its construction, portions of the conglomerate capstone have shifted, causing settlement and lateral movement of the outer parts of the residence. As part of recent renovation work, a comprehensive evaluation of foundation conditions was conducted to evaluate the cause of past structural movements and to develop a plan to stabilize the structure. This effort included the delineation of individual portions of conglomerate caprock supporting the structure, characterization of the nature and continuity of underlying soil and rock, and measurement of the direction of structural movements. Following an evaluation of this data, an underpinning program involving the use of micropiles was designed and installed to stabilize the individual conglomerate blocks, and to provide more stable permanent foundation support for the structure.