Quantitative Support for a Qualitative Foundation Reuse Assessment Tool

Laefer, Debra F.

doi:10.1061/41165(397)13

Cited by 5 publications

(6 citation statements)

References 3 publications

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“…The piles' lengths, L, are related by the scale factor N. The soil used in this study was Jumunjin sand. It is classified as SP in the Unified Soil Classification System (USCS) with γ min = 1.351 g/cm 3 , γ max = 1.596 g/cm 3 , and C u = 1.402 [40]. Where γ min is the minimum unit weight, γ max is the maximum unit weight, and C u is the coefficient of uniformity.…”

Section: Test Apparatusmentioning

confidence: 99%

“…steel) CMP1 3 200 10,000 16.7 500 CMP2 4 8000 400 1 Waveform micropile (WMP) with length of 500 mm; 2 Waveform micropile (WMP) with length of 400 mm; 3 Conventional micropile (CMP) with length of 500 mm; 4 Conventional micropile (CMP) with length of 400 mm. The soil used in this study was Jumunjin sand.…”

Section: Pile (Up)mentioning

confidence: 99%

“…Rapid population growth necessitates more urban building. The limited land in cities can be more quickly and less expensively returned to productive use if existing buildings and foundations could be expanded and reused rather than completely reconstructed or replaced [1][2][3]. The vertical extension of existing buildings is one way of reusing existing foundations to improve and increase the utilization of urban space.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Micropile Stiffness Affecting the Underpinning of an Existing Foundation

2019

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Underpinning in an existing foundation with piles is commonly used to improve their load-bearing capacity to allow vertical extension works. This study evaluated the effect of the piles’ stiffness on the load-sharing behavior of existing and underpinning piles during the vertical extension of existing buildings. A series of 1 g model tests, all with a scale factor of 1/20, was used to compare the underpinning performance of micropiles of varying stiffness. The performance was evaluated in terms of total settlement reduction and load sharing capacity. The results showed that the underpinning performance improved with the increase of underpinning pile stiffness. The ratio of carried loads of the underpinning pile to the existing pile increased linearly with its increasing stiffness (as expressed as a ratio relative to the stiffness of the existing pile).

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Section: Test Apparatusmentioning

confidence: 99%

Section: Pile (Up)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Micropile Stiffness Affecting the Underpinning of an Existing Foundation

2019

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“…It produces colourcoded diagrams as outputs of the sustainability assessment based on a traffic-light scoring scale ( Figure 2). It has been applied to many different types of projects, including master planning (McGregor and Roberts, 2003), acoustics (Braithwaite and Cowell, 2007), company performance (Braithwaite, 2007), environmental geotechnics (Jefferson et al, 2007), foundation reuse (Laefer, 2011), and geotechnical engineering projects (Holt et al, 2010).…”

Section: Background: Sustainability Indicator Systems For Utility Infmentioning

confidence: 99%

Embedding sustainability criteria into pre-appraisal of underground utility for future cities

Hojjati

Jefferson

Metje

et al. 2017

Proceedings of the Institution of Civil Engineers - Urban Desig

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The underground utility infrastructure (UUI) will play a crucial role in meeting the demand for creating sustainable and resilient urban developments that are fit for purpose today and in the far future. The utility streetworks operations, an important feature of the UUI system, include placement, maintenance, rehabilitation, renewal and upgrading of UUI, which can have adverse economic, social and environmental impacts. A key challenge, and one that will lead to lost opportunities for the best use of the near surface for utility provision for future cities, is the lack of a sustainability indicator system and assessment method for evaluating different utility streetworks solutions. To address this shortfall, this paper presents a new suite of indicators, or performance criteria, bespoke to utility streetworks projects as well as a pre-appraisal method based on the adaptation of the Arup SPeAR ® sustainability evaluation framework. An example of the application of the modified system is provided for a trenchless against trenching case study, and the lessons that flow from this are discussed in the wider context of the synthesis of utility service operations into sustainable, resilient, smart and liveable cities of the future.

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“…These were subsequently used without 55 prejudice to test the proposed hybrid method. The initial five case studies were taken from the 'Reuse 56 of Foundations for Urban Sites' handbook and were considered using the following assessment meth-57 ods: the modified SPeAR method as proposed by Laefer (2011), as a modification of Sustainable Pro- Association document C653 ). The modified SPeAR method generates a visual 62 output ( Figure 1) based on quantitative inputs generated from both site and community related factors 63 (Table 1).…”

Section: Previous Assessments 50mentioning

confidence: 99%

A hybrid method for foundation reuse evaluation

Laefer¹,

Farrell

2015

Environmental Geotechnics

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29This paper aims to provide a simple, multi-level method for engineers to conduct a pre-construction 30 viability assessment for reuse of existing foundations in congested urban areas. As part of this, the 31 first critical assessment is presented for three major foundation reuse evaluation tools in their ability 32 to predict the outcomes of five published case histories. Based on strengths and weakness identified in 33 that process, a hybrid system is proposed. This newly proposed, two-staged methodology is aimed to 34 address socio-economic drivers and technical requirements, as well as to promote future reuse where 35 current reuse is not viable. The proposed system was successfully verified by predicting the outcomes 36 of two other, previously published case histories. In that process, the main drivers were recognised, 37 while site-specific constraints and concerns were incorporated. Although the robustness and scalabil-38

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Quantitative Support for a Qualitative Foundation Reuse Assessment Tool

Abstract: This paper provides a quantification of the inputs for an existing qualitative foundation project planning model, namely

Cited by 5 publications

References 3 publications

Experimental Investigation of Micropile Stiffness Affecting the Underpinning of an Existing Foundation

Experimental Investigation of Micropile Stiffness Affecting the Underpinning of an Existing Foundation

Embedding sustainability criteria into pre-appraisal of underground utility for future cities

A hybrid method for foundation reuse evaluation

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