Risk Assessment in Geotechnical Engineering Practice

Sartain, Nick; Mian, Juliet; Peluso, Dan

doi:10.1061/9780784480731.024

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…The development of linear infrastructure such as roads, railways and bridges are highly susceptible to sinkhole subsidence damage (Guerrero et al, 2008;Cooper, 2020). Despite an increasing interest in the threat posed by sinkholes (e.g., Sartain et al, 2011;Land et al, 2018;Land, 2019), there is no robust method available to date for predicting and locating sinkholes prior to ground surface collapse. Monitoring systems that provide a continuous record of potential indicators of the sinkhole formation, e.g., surface deformations, are recommended (Gutierrez et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Distributed fibre optic sensing for sinkhole early warning: experimental study

Moller

Burke

et al. 2023

Géotechnique

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This paper presents experimental work aimed at proving the feasibility of using Distributed Fibre Optic Sensing (DFOS) as an early warning system for sinkhole detection. 1g experiments were conducted using a plane strain trapdoor and scaled to provide insight into the formation of a sinkhole in sand, in which DFOS cables are laid at selected depths. The DFOS data are compared with the geomechanics of the soil displacement, recorded using Particle Image Velocimetry (PIV). It was demonstrated that the DFOS exhibits a signature strain profile at the location of the sinkhole, allowing a sinkhole to be located using the DFOS data. Differences in the PIV and DFOS data are however apparent, notably the strain magnitudes. Nonetheless, it is possible to estimate the size and location of the sinkhole at depth using the DFOS data. Using a preliminary study of the development of the zone of subsidence, for a range of relative densities, it is then possible to predict the extent of the damage zone at ground surface. Such results show the potential for the incorporation of DFOS in the construction of critical infrastructure to enable early detection of sinkhole formation and thus opportunity for remedial action to prevent catastrophic failures.

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Section: Introductionmentioning

confidence: 99%

Distributed fibre optic sensing for sinkhole early warning: experimental study

Moller

Burke

et al. 2023

Géotechnique

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“…Sinkholes are a common occurrence on dolomitic land in South Africa. Dolomite is a rock that has been subjected to long periods of chemical weathering (Sartain et al 2011). This has resulted in cavities in the dolomite and the formation of highly variable residuum.…”

Section: Introductionmentioning

confidence: 99%

Comparison of sinkhole size versus borehole hazard classification

Bunk

2023

J. S. Afr. Inst. Civ. Eng.

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Sinkholes are a common occurrence on dolomitic land in South Africa. Different methods have been used in the past to classify the risk of sinkhole occurrence. The inherent hazard classifications (IHC) of boreholes are compared in this article to actual sinkhole occurrences. The national sinkhole database and the ENGEODE database of boreholes, both belonging to the Council for Geoscience (CGS), were used for this comparison between the IHC of the borehole and the size of the sinkhole that occurred within a 50 m radius. Thus, the sinkholes in the database were used for this comparison that had a borehole located within 50 m from the sinkhole. Four regions were identified and described separately, namely the Far West Rand, the Tshwane and Ekurhuleni Municipalities as separate areas, and the fourth group as the Johannesburg and Sedibeng Municipalities and the Mpumalanga, North West and Northern Cape Provinces. Although a very high percentage has been underestimated (ranging from 42% to 59% for the different regions), there is a relatively good IHC correlation between the hazard classification of the boreholes and the sinkholes (between 56% to 67%). Another problem is that an IHC of 1 to 4 (low to medium risk) was assigned to the boreholes in 17% to 29% of the cases for the different areas, yet sinkholes still formed. These areas are more problematic, since the risk from the drilling has been underestimated. The current methodology to classify boreholes has not proved to be one hundred percent accurate to predict the size of the sinkhole for the area, and several factors have been highlighted that should be taken into account when boreholes are classified. Further research needs be carried out around the discrepancies between the IHC of boreholes compared to actual sinkholes.

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“…[118] [119] [120]. Occurrence probabilities of risk events, assessment of consequences, and planning of control strategies require to acknowledge the risk at the very end and provide remedial measures to avoid the risk or recovery methods in the event based on informed decisions[121] [122].…”

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confidence: 99%

Deep Foundation Pit Excavations Adjacent to Disconnected Piled Rafts: A Review on Risk Control Practice

Uge¹,

Guo²

2020

OJCE

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Foundation pit excavation engineering is an old subject full of decision making. Yet, it still deserves further research due to the associated high failure cost and the complexity of the geological conditions and/or the surrounding existing infrastructure around it. This article overviews the risk control practice of foundation pit excavation projects in close proximity to existing disconnected piled raft. More focus is given to geotechnical aspects. The review begins with achievements to ensure excavation performance requirements, and follows to discuss the complex soil structure interaction involved among the fundamental components: the retaining wall, mat, piles, cushion, and the soil. After bringing consensus points to practicing engineers and decision makers, it then suggests possible future research directions.

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Risk Assessment in Geotechnical Engineering Practice

Cited by 3 publications

References 2 publications

Distributed fibre optic sensing for sinkhole early warning: experimental study

Distributed fibre optic sensing for sinkhole early warning: experimental study

Comparison of sinkhole size versus borehole hazard classification

Deep Foundation Pit Excavations Adjacent to Disconnected Piled Rafts: A Review on Risk Control Practice

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