Proceedings of the Institution of Civil Engineers-Ground Improvement最新文献_第4页

Improvement of chalk solution feature infill by rapid impact compaction 快速冲击压实法改善白垩溶液充填特性

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-02-18 DOI: 10.1680/jgrim.21.00062

Alastair Dewar, C. Wong, Burden Chitambira

引用次数: 1

A novel application of vacuum preloading: conception, analysis and performance evaluation 真空预压的新应用:概念、分析和性能评价

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-02-18 DOI: 10.1680/jgrim.21.00058

A. de Lillis, G. Fasano, A. Flora, S. Miliziano

{"title":"A novel application of vacuum preloading: conception, analysis and performance evaluation","authors":"A. de Lillis, G. Fasano, A. Flora, S. Miliziano","doi":"10.1680/jgrim.21.00058","DOIUrl":"https://doi.org/10.1680/jgrim.21.00058","url":null,"abstract":"The paper presents an original application of vacuum preloading, conceived for the reclamation of containment facilities hydraulically filled with fine-grained sediments, and the evaluation of its performance. The technique, which consists in the installation of horizontal vacuum layers within the dredged soil mass, with the aim of reducing the soil volume and accelerating the consolidation while filling is underway, was successfully implemented for the first time in the port of Gaeta (Italy). The construction sequence and the numerical models developed to analyse the huge changes of state experienced by the soil – whose prediction is paramount in evaluating the actual storage capacity of the impoundments – are described. Monitoring data and in situ test results are illustrated and compared with numerical predictions (class A, C and back-analyses), confirming the effectiveness of the technique and of the modelling choices. Finally, the lessons learned from the case history to optimise the use of the technical solution and of the modelling approach are reported. The presented vacuum preloading technique and analysis methods can be highly beneficial to the environmentally sound and cost-effective design of reclamation works, especially, but not only, those involving undersized containment facilities.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72579679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effect of alkali treated sisal fibre on expansive clay 碱处理剑麻纤维对膨胀粘土的影响

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-02-18 DOI: 10.1680/jgrim.21.00033

K. Muthukkumaran, R. Sindhujha, V. Anusudha

{"title":"Effect of alkali treated sisal fibre on expansive clay","authors":"K. Muthukkumaran, R. Sindhujha, V. Anusudha","doi":"10.1680/jgrim.21.00033","DOIUrl":"https://doi.org/10.1680/jgrim.21.00033","url":null,"abstract":"In this study, the synergic effects of alkaline activation (AA) and fibre inclusions, on the mechanical behaviour of fly ash stabilized black cotton soil was investigated. The natural fibre used in this research was treated with Sodium Hydroxide (NaOH) solution as an expedient solution to attain durability. The fibres are added in two forms: discrete fibres and geotextile. Assessment of engineering behaviour of the AA-treated soil reinforced with surface coated sisal fibres was carried out by conducting various laboratory tests like Free Swell (FS) test, Unconfined Compressive Strength (UCS) test, and cyclic triaxial test. Microstructural characterization was done by Scanning Electron Microscope (SEM) analysis and Fourier Transform Infra-Red (FTIR) spectroscopy analysis. The test results conclusively showed that the alkaline activated-fly ash treated-sisal fibre reinforced soil exhibits better mechanical behaviour in terms of peak stress and post-peak behaviour and appreciable resistance to swelling. Overall, the study shows that fibre-reinforced AA-fly ash amendment could effectively enhance the strength, stiffness and toughness of the soil and could subsidize the anticipated detrimental effects that could cause by dynamic loading. This study affirms the potential of alkali-treated sisal fibre as an alternative to traditional stabilizers for construction involving expansive soil.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77794439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Life Cycle Assessment Comparison of Distinct Soil Stabilizations Methods: An Environmental and Cost Approach to the Soil Improvement 不同土壤稳定方法的生命周期评价比较:土壤改良的环境和成本方法

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-02-18 DOI: 10.1680/jgrim.21.00006a

G. Miguel, R. B. Saldanha, A. da Silva, L. Festugato, Helder Mansur Chaves, C. Mendes

{"title":"Life Cycle Assessment Comparison of Distinct Soil Stabilizations Methods: An Environmental and Cost Approach to the Soil Improvement","authors":"G. Miguel, R. B. Saldanha, A. da Silva, L. Festugato, Helder Mansur Chaves, C. Mendes","doi":"10.1680/jgrim.21.00006a","DOIUrl":"https://doi.org/10.1680/jgrim.21.00006a","url":null,"abstract":"Dispersive soils became a worldwide major concern owing to its high susceptibility to erosion, which is responsible for ravines, tunnels, among others problems. Commonly, ordinary Portland cement or even hydrated lime are employed to solve the aforementioned drawbacks. Nonetheless, alternative treatments have been suggested to provide options to replace natural resources. Therefore, the present study aims to compare two distinct soil stabilization methods, namely, dispersive soil-hydrated lime and dispersive soil-ground waste glass-carbide lime through an environmental life cycle and life cycle cost approach. The proposed assessment was carried out according to life cycle inventories responsible to stabilize 1.0 m³ of the two distinct mixtures. Among the 18 impact categories evaluated in the environmental life cycle assessment, the alternative binder was less impacting than the traditional hydrated lime over the entire impact categories. Concerning to the cost approach, the traditional stabilization based on hydrated lime had an approximate total cost of US$ 12.02, whereas the alternative stabilization methodology a cost of US$ 39.58. Thereby, ground waste glass-carbide lime binder has potential to be known as an alternative environment friendly binder to soil stabilization, succeeding in both mechanical and environment performances but being unsuccessful in terms of costs until the present moment.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83879114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reducing hydraulic erosion of surficial sand layer by inoculation of cyanobacteria 接种蓝藻减少浅层砂层水力侵蚀

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-02-18 DOI: 10.1680/jgrim.21.00017

Asma Rabiei, Seyed Mohammad Ali Zomorodian, B. O’Kelly

{"title":"Reducing hydraulic erosion of surficial sand layer by inoculation of cyanobacteria","authors":"Asma Rabiei, Seyed Mohammad Ali Zomorodian, B. O’Kelly","doi":"10.1680/jgrim.21.00017","DOIUrl":"https://doi.org/10.1680/jgrim.21.00017","url":null,"abstract":"Biological approaches have captured the attention of researchers regarding the beneficial effects of cyanobacteria inoculation in improving surficial soil stability. However, a gap exists in the literature regarding the impact of inoculation by individual cyanobacteria on stability of sand under intense surface-water erosion. This study assesses the improvements achieved in erosion resistance for biological soil crust (BC) formed on medium–coarse silica sand. Specimen groups were inoculated with Nostoc sp. and Calothrix sp., incubated for 32- or 48 day periods and then tested using an erosion function apparatus (EFA), investigating a wide range of flow velocities (hydraulic shear stresses). The significance of BC attachment to (or detachment from) the specimen container sidewall was also investigated in the EFA testing. Compared with untreated sand, inoculated specimens had a significantly greater erosion resistance that increased with the incubation period, with Nostoc inoculum producing greater reductions in erodibility coefficients (45–75%) compared with Calothrix (16–67%). Contrasting bond structures introduced by Nostoc and Calothrix are highlighted by scanning electron microscopy images that showed long Nostoc filaments were entangled more strongly in sand pore voids compared with short Calothrix filaments. In conclusion, this study supports the idea of using cyanobacteria inoculation as an eco-friendly, cost-benefit and effective technique for mitigating land degradation.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87267650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Swell–shrink behaviour of fly ash-stabilised expansive soils 粉煤灰稳定膨胀土的胀缩特性

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-02-18 DOI: 10.1680/jgrim.21.00024

T. Ashok Kumar, T. Thyagaraj, R. Robinson

{"title":"Swell–shrink behaviour of fly ash-stabilised expansive soils","authors":"T. Ashok Kumar, T. Thyagaraj, R. Robinson","doi":"10.1680/jgrim.21.00024","DOIUrl":"https://doi.org/10.1680/jgrim.21.00024","url":null,"abstract":"Class C fly ash, a byproduct of thermal power plants, is often preferred for the stabilisation of expansive soils. However, improper optimisation of the stabiliser may lead to the premature failure of treated soils during wet–dry cycles. This study demonstrates the volume change behaviour of fly ash-stabilised expansive soils subjected to wet–dry cycles. Furthermore, the effect of class C fly ash and lime–class C fly ash on the physical and engineering properties is also studied. The experimental results showed that addition of 20% fly ash to the expansive soil reduced the swell potential to 0% from an untreated swell value of 10.5%. However, when it was subjected to five wet–dry cycles, the initial cementitious effect of the fly ash on controlling the swell was partially lost, and therefore the volumetric deformation of the stabilised expansive soil increased from 0 to 14.5%. Furthermore, among the different additive combinations used for the treatment of expansive soils, it was observed that the combination of 4% lime and 20% fly ash resulted in the volumetric deformation of only 2.05% even after the fifth wet–dry cycle. Besides, the percentage of desiccation cracks has also reduced significantly from 29 to 0.5%.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86208321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Using ground blast-furnace slag grouts with biopolymer additives for improving sandy soils 掺加生物聚合物添加剂的高炉矿渣灌浆改良砂质土壤

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-01-27 DOI: 10.1680/jgrim.21.00010

H. Khatami, B. O’Kelly

引用次数: 1

Behaviour of soft soils following soil mixing in controlled and uncontrolled environments 软土在受控和非受控环境下混合后的行为

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2021-10-18 DOI: 10.1680/jgrim.20.00013

V. Sivakumar, S. Walker, A. Ewart, C. Doherty, S. Donohue

引用次数: 0

Laboratory investigation of geogrout inclusion: the influence of the substitution ratio 地浆液包裹体的室内研究:替代率的影响

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2021-10-18 DOI: 10.1680/jgrim.21.00009

Guilherme Faria Souza Mussi de Andrade, Bruno Lima, A. Sieira

引用次数: 1

Effects of fibre additions on the tensile strength and crack behaviour of unsaturated clay 纤维添加量对非饱和粘土抗拉强度和开裂特性的影响

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2021-10-18 DOI: 10.1680/jgrim.21.00006

Jianye Wang, P. Hughes, C. Augarde

引用次数: 0