Proceedings of DFI-India 2018: 8th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
Performance of Contiguous Bored Pile Wall Retention System: A Case Study
Vimala Chinnasamy, Sr. Geotechnical Engineer and Madan Kumar Annam, Head of Engineering
Design of retention system for construction of basements needs technical expertise and well-planned monitoring system to check probable deflections of the retaining structure including subsidence around the excavation pit. The construction of basements with proximity to adjacent structures and busy roads is the most challenging aspect for the practicing engineer. This demand understanding of the complexity of the problem, risk involved and assumptions on soil structure interaction. A simple 2-dimensional analysis using numerical modelling can normally be chosen to assess the exact behavior of the retention structure. Performance of a retention system for deep excavation of 11.5m for three basements having a perimeter of about 215m long, surrounded by high raised buildings is selected for study in this paper. Contiguous bored pile wall with single level inclined ground anchors was adopted as an optimistic temporary retention system in this project after allowing removal of 3.0m of surface soil. A well planned monitoring program was carried out during excavation stages to study the performance of retention system. This paper covers discussions on analysis of retention system using WALLAP and PLAXIS 2D and comparing measured deflections of the wall.
|article #3179; publication #1050 (India2018)|