Abstract
This paper documents the measured performance of a test section of braced excavation for a subway. The excavation was 37 ft wide and 58 ft deep, and five levels of struts were installed. The subsoil consists of fill, silt, till and rock. The water table was from 6 ft to 8 ft below ground surface. The instruments installed were slope indicators, piezometers, and strain gages. The typical horizontal inward movement of the sheeting was 5 in., and the maximum movement on one sheeting was 9 in. A maximum surface settlement of 7 in. occurred outside the excavation. Large drops in pore pressure occurred in the soil over a distance (greater than 70 ft) far back from the excavation. The strut loads measured showed a wide variation but the average maximum values, except in the top strut, were less than half the design loads. The maximum strut loads occurred at an intermediate state of excavation. Details of construction procedure greatly influenced the behavior of the braced excavation.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Journal of the Soil Mechanics and Foundations Division
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.