Infrastructure Damage Due to Dewatering Without Considering Land Use History
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TECHNICAL NOTE
Infrastructure Damage Due to Dewatering Without Considering Land Use History Ramesh Vandanapu . Joshua R. Omer
Received: 10 November 2019 / Accepted: 2 May 2020 Springer Nature Switzerland AG 2020
Abstract Geotechnical processes such as subsidence, seepage, scouring, extreme temperatures as well as geological events pose constructional challenges even despite advancements in design codes, ground investigation techniques and numerical analysis. This paper analyses a case record where subsidence and damages to existing structures occurred adjacent to a location where dewatering works were being carried out for a new pipeline. Initially, the damages were thought to be solely linked to the dewatering effects, but it was still a puzzle as to why the problems only occurred at particular locations and not over the entire dewatered area. To solve the puzzle, forensic ground investigation and geophysics were performed. Based on borehole and CPT results, the ground profile was interpreted and compared with results from two parallel geophysical methods. Both of these revealed that the problem area was part of an old channel that had been dredged decades earlier and reclaimed by filling with loose material. This was corroborated by theoretical calculations of ground subsidence, which was found to be consistent with values of 600–700 mm measured on site. This work
R. Vandanapu (&) Amity University, Dubai, UAE e-mail: [email protected] J. R. Omer School of Engineering and the Environment, Kingston University London, London, UK
therefore demonstrates the importance of thorough consideration of past site history as part of design of new works or analysis of dewatering effects on existing structures. Keywords Geotechnical investigation Site history Case study Dewatering
1 Introduction Of all engineering materials soils are probably the most challenging to model in rheological terms, being highly variable and subject to complex states of stress, phase changes, pore pressures, time-dependent processes and other effects (Tonks et al. 2017). Despite these challenges, evolutions in research, testing and computing technology have made it possible for soil behaviour to be predictable with greater and greater certainty, depending upon the level of investigations conducted. Furthermore, there are problematic soils such as expansive soils and collapsible soils which pose extra difficulties in geotechnical design and construction. Such soils may be able to support load when in the undisturbed in-situ state but may behave radically differently under the influence of water, cyclic stresses, temperature changes etc. Some soft cohesive soils are highly responsive to changes in moisture hence prone to rapid settlement or swelling. Most clays exhibit gradual settlement with time when
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loaded whereas coarse granular soils generally undergo rapid settlement under load (Coduto 2010). Sands which are collapsible in nature have relatively high vo
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