Abstract
This study presents two field cases of deep excavation using the hydraulic servo geotechnology as an enhancement to the lateral support. The first excavation process was preceded with numerical simulation to investigate the deformation of excavation pit with and without servo geotechnology. Optimised axial loading capacities from the numerical simulation were adopted at the actual excavation site. On the second excavation site, servo geotechnology was applied directly on the excavation process during actual construction without prior numerical simulation. The results showed that the servo steel support geotechnology restrained above 70% of lateral displacements of the excavated walls, and ground surface influence zone settlements were kept within the acceptable warning limits. Prior application of the numerical simulation before field excavation optimised axial loads and kept the deformation caused by excavation within project limits. The numerical simulation of servo geotechnology deformation control capacity for deep excavation projects is validated, and this study provides a practical and significant reference on similar projects.
Highlights
Ming-Guang et al [18] pointed out that the application of servo method in deep excavations is based on engineers’ experience and depends wholly on the available commercial software programs such as PLAXIS 3D and FLAC3D
With the process of urbanization, there are more deep excavation projects adjacent to structures and a strict requirement for excavation-induced deformation control. us, research regarding this phenomenon is still required. erefore, this research takes two actual field projects and seeks to augment the actual field construction site applications of servo geotechnology with the numerical results to confirm the strength of servo method in deformation control caused by excavation in soft soil urban environment
Case studies of two real field construction site application of hydraulic servo steel enhanced support geotechnology were carried out. e two construction site processes were monitored. e results from actual field works were compared well with previous research works based on numerical simulations on analysing the capacity of servo geotechnology enhanced supported system
Summary
A deep braced excavation commonly consists of a retaining wall and lateral support such as steel struts. e lateral support is enhanced by the hydraulic servo system for the increased axial loading capacity. En, the combined steel and servo load lateral support in (1) works together to control the deformation within the set limit. When this limit is exceeded and the retaining wall moves to the inside of the excavation pit, the support loading capacity is raised in an automatic control system module via an adjustable connector, U. If the retaining wall moves away from the excavation pit, the set support loading capacity is reduced, controlling the wall deformation within acceptable project warning limit.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call