The potential of X-ray scattering measurements for monitoring changes on the nano-scale in fine-grained materials in their natural wet state is demonstrated with a series of feasibility tests on well-controlled, kaolin samples, i.e. water content, pH and loading history. The results indicate that subtle changes on the nanometric scale, especially the particle orientations, can be measured with high fidelity using a standard laboratory Small and Wide angle X-ray Scattering instrument. This opens up possibilities for future in-situ loading tests with simultaneous monitoring of the evolving changes of the fabric in fine-grained soils.
{"title":"Macroscopic interpretation of nano-scale scattering data in clay","authors":"G. Birmpilis, R. Ahmadi-Naghadeh, J. Dijkstra","doi":"10.1680/jgele.18.00241","DOIUrl":"https://doi.org/10.1680/jgele.18.00241","url":null,"abstract":"The potential of X-ray scattering measurements for monitoring changes on the nano-scale in fine-grained materials in their natural wet state is demonstrated with a series of feasibility tests on well-controlled, kaolin samples, i.e. water content, pH and loading history. The results indicate that subtle changes on the nanometric scale, especially the particle orientations, can be measured with high fidelity using a standard laboratory Small and Wide angle X-ray Scattering instrument. This opens up possibilities for future in-situ loading tests with simultaneous monitoring of the evolving changes of the fabric in fine-grained soils.","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"19 1","pages":"355-360"},"PeriodicalIF":2.1,"publicationDate":"2019-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78553044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Fonseca, A. Riaz, J. Bernal-Sanchez, D. Barreto, J. McDougall, M. Miranda-Manzanares, A. Marinelli, V. Dimitriadi
Sand−rubber mixture (SRm) behaviour is affected by rubber content (RC) while dissipation in sands is caused by inter-particle sliding. Dissipation in SRm is as, or more significant than in sands. However, the mechanisms of dissipation in SRm are not well understood. In this study, one-dimensional compression tests on sand samples with RC of 0, 15, 30, 45 and 100% by mass were performed on a standard oedometer. In addition, a SRm with RC of 30% was tested on a mini-oedometer placed inside an X-ray scanner and three-dimensional images of the internal structure of the material were acquired at three stages during loading and unloading. Image analysis was used to infer particle-scale measurements and provide experimental evidence to help explaining the energy dissipation mechanisms for SRm. It is postulated here that energy dissipation in these mixtures is dominated by inter-particle sliding at initial stages of loading, but once rubber particles fill the void spaces between the sand, deformation and dissipation mechanisms are dominated by the deformation of the rubber particles.
{"title":"Particle–scale interactions and energy dissipation mechanisms in sand–rubber mixtures","authors":"J. Fonseca, A. Riaz, J. Bernal-Sanchez, D. Barreto, J. McDougall, M. Miranda-Manzanares, A. Marinelli, V. Dimitriadi","doi":"10.1680/JGELE.18.00221","DOIUrl":"https://doi.org/10.1680/JGELE.18.00221","url":null,"abstract":"Sand−rubber mixture (SRm) behaviour is affected by rubber content (RC) while dissipation in sands is caused by inter-particle sliding. Dissipation in SRm is as, or more significant than in sands. However, the mechanisms of dissipation in SRm are not well understood. In this study, one-dimensional compression tests on sand samples with RC of 0, 15, 30, 45 and 100% by mass were performed on a standard oedometer. In addition, a SRm with RC of 30% was tested on a mini-oedometer placed inside an X-ray scanner and three-dimensional images of the internal structure of the material were acquired at three stages during loading and unloading. Image analysis was used to infer particle-scale measurements and provide experimental evidence to help explaining the energy dissipation mechanisms for SRm. It is postulated here that energy dissipation in these mixtures is dominated by inter-particle sliding at initial stages of loading, but once rubber particles fill the void spaces between the sand, deformation and dissipation mechanisms are dominated by the deformation of the rubber particles.","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"102 1","pages":"263-268"},"PeriodicalIF":2.1,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85461501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The results of one-dimensional compression tests on dry and saturated crushable sand are analysed in order to identify the role of wetting and particle breakage on primary and secondary compression...
分析了干燥和饱和可破碎砂的一维压缩试验结果，以确定润湿和颗粒破碎对一次压缩和二次压缩的影响。
{"title":"Role of particle breakage in primary and secondary compression of wet and dry sand","authors":"C. Ovalle","doi":"10.1680/JGELE.18.00047","DOIUrl":"https://doi.org/10.1680/JGELE.18.00047","url":null,"abstract":"The results of one-dimensional compression tests on dry and saturated crushable sand are analysed in order to identify the role of wetting and particle breakage on primary and secondary compression...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"94 6 1","pages":"161-164"},"PeriodicalIF":2.1,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87672635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sanandam Bordoloi, V. Gadi, Rojimul Hussain, L. Sahoo, A. Garg, S. Sreedeep, G. Mei, T. Poulsen
Eichhornia Crassipes also known as water hyacinth (WH) is listed among the world's most invasive weed species. In tropical regions, green infrastructures have to undergo multiple drought cycles which induces desiccation cracks and also lead to water stressed condition of plants. The use of organic materials is advocated in green infrastructure for increasing water retention and ground covering ability of vegetation. The main objective of this letter is to explore the influence of inclusion of waste WH fibers on hydraulic characteristics (water retention and cracking) of vegetated soils. Three soil series including bare (without vegetation) soil (BS), (soil + grass (SG)) and (soil + grass + WH-fiber (SGWH)) were tested for 73 days. Grass parameters (Stomatal conductance-SC, Evapotranspiration-Etr, grass density-GD, shoot length-SL) and soil parameters (suction- ψ, volumetric moisture content-θ, crack intensity factor-CIF, Evaporation-Er) were monitored for all series. SGWH decreases the CIF potential of so...
{"title":"Influence of fiber from waste weed Eichhornia Crassipes on water retention and cracking characteristics of vegetated soils","authors":"Sanandam Bordoloi, V. Gadi, Rojimul Hussain, L. Sahoo, A. Garg, S. Sreedeep, G. Mei, T. Poulsen","doi":"10.1680/jgele.17.00181","DOIUrl":"https://doi.org/10.1680/jgele.17.00181","url":null,"abstract":"Eichhornia Crassipes also known as water hyacinth (WH) is listed among the world's most invasive weed species. In tropical regions, green infrastructures have to undergo multiple drought cycles which induces desiccation cracks and also lead to water stressed condition of plants. The use of organic materials is advocated in green infrastructure for increasing water retention and ground covering ability of vegetation. The main objective of this letter is to explore the influence of inclusion of waste WH fibers on hydraulic characteristics (water retention and cracking) of vegetated soils. Three soil series including bare (without vegetation) soil (BS), (soil + grass (SG)) and (soil + grass + WH-fiber (SGWH)) were tested for 73 days. Grass parameters (Stomatal conductance-SC, Evapotranspiration-Etr, grass density-GD, shoot length-SL) and soil parameters (suction- ψ, volumetric moisture content-θ, crack intensity factor-CIF, Evaporation-Er) were monitored for all series. SGWH decreases the CIF potential of so...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"96 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2018-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76995328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Although pore water pressure was of significance to understand soil behaviour, limited efforts have been devoted to explore and understand pore water pressure responses due to fault propagation. Th...
{"title":"Effects of cementation on pore water pressure response during normal faulting in clay","authors":"Q. Cai, C. Ng, Xingxin Chen, Gu Liqun, S. Su","doi":"10.1680/JGELE.17.00160","DOIUrl":"https://doi.org/10.1680/JGELE.17.00160","url":null,"abstract":"Although pore water pressure was of significance to understand soil behaviour, limited efforts have been devoted to explore and understand pore water pressure responses due to fault propagation. Th...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"73 1","pages":"56"},"PeriodicalIF":2.1,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83742279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Doreau-Malioche, G. Combe, G. Viggiani, J. Toni
The mechanisms occurring at the grain scale at sand–pile interface under axial cyclic loading are analysed quantitatively in a mini calibration chamber, using X-ray tomography and three-dimensional...
{"title":"Shaft friction changes for cyclically loaded displacement piles: an x-ray investigation","authors":"J. Doreau-Malioche, G. Combe, G. Viggiani, J. Toni","doi":"10.1680/JGELE.17.00141","DOIUrl":"https://doi.org/10.1680/JGELE.17.00141","url":null,"abstract":"The mechanisms occurring at the grain scale at sand–pile interface under axial cyclic loading are analysed quantitatively in a mini calibration chamber, using X-ray tomography and three-dimensional...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"852 1","pages":"1-28"},"PeriodicalIF":2.1,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85472415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study uses statistical methods to examine the homogeneity of a chemically treated granular soil. Reactive solutions have been injected to promote mineral precipitation, thus generating solid d...
本研究使用统计方法来检验化学处理颗粒土的均匀性。注入反应性溶液以促进矿物沉淀，从而产生固体d…
{"title":"Assessment of statistical homogeneity in chemically treated granular materials","authors":"G. Shahin, M. Cil, G. Buscarnera","doi":"10.1680/JGELE.17.00120","DOIUrl":"https://doi.org/10.1680/JGELE.17.00120","url":null,"abstract":"This study uses statistical methods to examine the homogeneity of a chemically treated granular soil. Reactive solutions have been injected to promote mineral precipitation, thus generating solid d...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"78 1","pages":"32-39"},"PeriodicalIF":2.1,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80082174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Ng, Rafa Tasnim, Vittoria Capobianco, J. L. Coo
The effects of nutrients on plant growth have been widely studied. In agricultural research, some studies have showed significant root growth in high-nutrient-supplied soil, however, some other stu...
{"title":"Influence of soil nutrients on plant characteristics and soil hydrological responses","authors":"C. Ng, Rafa Tasnim, Vittoria Capobianco, J. L. Coo","doi":"10.1680/JGELE.17.00104","DOIUrl":"https://doi.org/10.1680/JGELE.17.00104","url":null,"abstract":"The effects of nutrients on plant growth have been widely studied. In agricultural research, some studies have showed significant root growth in high-nutrient-supplied soil, however, some other stu...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"25 1","pages":"19-24"},"PeriodicalIF":2.1,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87146109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The surface texture of the interface material plays a significant role in the shear behaviour of soil–continuum interface. This study investigates the influence of surface texture of steel on the s...
界面材料的表面结构对土-连续介质界面的剪切性能有重要影响。本文研究了钢的表面织构对其性能的影响。
{"title":"Influence of surface texture on sand–steel interface strength response","authors":"M. Samanta, P. Punetha, Mahesh Sharma","doi":"10.1680/JGELE.17.00135","DOIUrl":"https://doi.org/10.1680/JGELE.17.00135","url":null,"abstract":"The surface texture of the interface material plays a significant role in the shear behaviour of soil–continuum interface. This study investigates the influence of surface texture of steel on the s...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"34 1","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73520022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, a single unrestrained passive pile in a two-layered cohesionless soil is analysed with the aim to evaluate its contribute in terms of resistance at the depth of an assigned sliding s...
本文对两层无粘性土中的单桩无约束被动桩进行了分析，目的是评价其在指定滑动层深度处的阻力贡献。
{"title":"Ultimate lateral resistance of passive piles in non-cohesive soils","authors":"I. Bellezza, L. Caferri","doi":"10.1680/JGELE.17.00113","DOIUrl":"https://doi.org/10.1680/JGELE.17.00113","url":null,"abstract":"In this paper, a single unrestrained passive pile in a two-layered cohesionless soil is analysed with the aim to evaluate its contribute in terms of resistance at the depth of an assigned sliding s...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"12 1","pages":"5-12"},"PeriodicalIF":2.1,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89049709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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