Geotechnical Research最新文献

Theory of liquid and plastic limits for fine soils, methods of determination and outlook 细土的液限和塑限理论、确定方法和展望

IF 1.9

Geotechnical Research Pub Date : 2023-12-04 DOI: 10.1680/jgere.23.00038

B. O’Kelly

{"title":"Theory of liquid and plastic limits for fine soils, methods of determination and outlook","authors":"B. O’Kelly","doi":"10.1680/jgere.23.00038","DOIUrl":"https://doi.org/10.1680/jgere.23.00038","url":null,"abstract":"Albert Atterberg introduced various consistency limits (state transitions) for fine-grained soil in the 1910s. Of these, the liquid limit (LL) and plastic limit (PL) are ubiquitous in geotechnical engineering practice, including their usage for soil classification purposes and in deducing useful geotechnical parameters via correlations. Given it is about 120 years since first introduced, it seems timely to critically review the current state of play regarding various definitions and theory of these index parameters and their standardised testing methods, as described in majorly used codes worldwide. Because different codes allow different LL apparatus types and employ some dissimilar criteria (e.g., in establishing the end-point for the PL test), a change in method or code may produce different results for testing the same soil. These differences are rationalised in terms of the controlling parameter(s). Some potential pitfalls in consistency limits testing are highlighted. Attention then turn to strength-based approaches, mostly employing fall cone (FC) setups, emphasising their unsuitability for determining Atterberg’s PL. Considering the PL test’s general poor reproducibility, the paper concludes with an alternative way forward, obtaining useful FC index parameters that provide new possibilities for strength predictions and in the classification of fine-grained soils.","PeriodicalId":44054,"journal":{"name":"Geotechnical Research","volume":"6 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138602010","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

Slope visualization and stability study using GIS technology and UAV 基于GIS技术和无人机的边坡可视化与稳定性研究

Geotechnical Research Pub Date : 2023-10-27 DOI: 10.1680/jgere.23.00030

Xianghui Jian

{"title":"Slope visualization and stability study using GIS technology and UAV","authors":"Xianghui Jian","doi":"10.1680/jgere.23.00030","DOIUrl":"https://doi.org/10.1680/jgere.23.00030","url":null,"abstract":"High-precision visualized 3D slope modeling and stability analysis have benefited from the quick development of big data technology. The research aims to utilize unmanned aerial vehicle survey data to obtain influencing information on slope topography. A high-precision three-dimensional surface model is established, which is then overlaid with three-dimensional geological models and three-dimensional mineral models constructed using Geographic Information System technology. This approach enables more efficient and accurate three-dimensional visualization modeling of slopes. Based on the 3D model, the search for the most dangerous sliding surface under the rainfall conditions is completed. The average absolute error of sample points in the surface modeling effect verification experiment is less than 0.5 m and the average relative error is less than 2%. These results indicate that the overall modeling effect of 3D slope model can meet the requirements of subsequent stability analysis. According to the results of random simulation, the minimum safety factor on the most neutral surfaces is less than 1, which indicates that the slopes at some locations in this site do have the possibility of landslide. The neutral surface where the least safety factor appears can be used to pinpoint the position of the most hazardous sliding surface.","PeriodicalId":44054,"journal":{"name":"Geotechnical Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136263451","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

Retrospective evaluation of large settlement of a very soft clay 极软黏土大沉降的回顾性评价

Geotechnical Research Pub Date : 2023-10-17 DOI: 10.1680/jgere.23.00022

Curtis Jensen, Michael Jefferies

{"title":"Retrospective evaluation of large settlement of a very soft clay","authors":"Curtis Jensen, Michael Jefferies","doi":"10.1680/jgere.23.00022","DOIUrl":"https://doi.org/10.1680/jgere.23.00022","url":null,"abstract":"The Harbor Bay Isle residential project in Alameda, California comprises some 600 acres reclaimed from the margin of San Francisco Bay underlain by very soft (Cc ∼ 1), high water-content clay (e0 >2): San Francisco Bay Mud. Settlements of as much as 2.5 m developed from about 7 m (varying across the site) of sandfill surcharge, with records over some 43 years extending through primary consolidation and into secondary (creep). Iterative numerical modelling using large-strain theory (implemented in Excel), constrained by insitu void ratios and oedometer trends, achieved close matches to settlement histories over the full 43 years for the three locations considered each of which displayed a markedly different history from the others. The presence or absence of a dried ‘crust’ was found unimportant; instead, the proportion of sub-units within the Bay Mud controlled the evolution of settlements. Sub-units within Bay Mud, evident in modern CPTu soundings (which were not available during the reclamation works), exist across the region and have systematically different states and properties. Further, while ageing is a factor, depositional conditions of the Bay Mud have produced a residual fabric that presents as a component of the pre-consolidation pressure.","PeriodicalId":44054,"journal":{"name":"Geotechnical Research","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135943975","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

Numerical modeling of skirt foundation under vertical load 垂直荷载作用下裙座基础的数值模拟

Geotechnical Research Pub Date : 2023-10-02 DOI: 10.1680/jgere.23.00005

Hadi Moghadam Joybari, Mobin Afzali Rad, Hanieh Hosseinzadeh, Naveen B P.

引用次数: 0

Consolidation and microstructural behaviour of soil treated with palm oil fuel ash-based geopolymer 棕榈油燃料灰基地聚合物处理土壤的固结和微观结构行为

IF 1.9

Geotechnical Research Pub Date : 2023-07-04 DOI: 10.1680/jgere.23.00013

I. Khasib, N. Daud, MohammadAli Izadifar

{"title":"Consolidation and microstructural behaviour of soil treated with palm oil fuel ash-based geopolymer","authors":"I. Khasib, N. Daud, MohammadAli Izadifar","doi":"10.1680/jgere.23.00013","DOIUrl":"https://doi.org/10.1680/jgere.23.00013","url":null,"abstract":"In recent times, geopolymer has gained attention as a soil stabilization binder due to its ability to improve soil’s engineering properties while remaining eco-friendly. This study seeks to investigate the stabilization of soft soil using palm oil fuel ash (POFA)-based geopolymers. The geopolymer was created by combining POFA with an alkaline activator solution composed of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). The mechanical and microstructural behaviour of two clayey soil types stabilized with four doses of POFA-based geopolymer (G10PA, G20PA, G30PA, G40PA) was studied by conducting one-dimensional consolidation, California Bearing Ratio (CBR), Field Emission Scanning Electron Microscopy (FESEM), and X-Ray Diffraction (XRD) tests. The optimum dosage found was G40PA in both soil samples. The CBR value of S1-G40PA was 1.7 times the S1 while S2-G40PA was nearly 1.5 times the S2. The void ratio of S1 was significantly reduced from 0.70 (untreated sample) to 0.56 (S2-G40PA), whereas for S2, it was decreased from 1.43 (untreated sample) to 0.43 (S2-G40PA). The microstructural analysis (FESEM) revealed that changes in material composition correlate to consolidation behaviour, with the geopolymer gel-binding effect enhancing the mechanical properties of stabilized soils.","PeriodicalId":44054,"journal":{"name":"Geotechnical Research","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44995758","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

Editorial 社论

IF 1.9

Geotechnical Research Pub Date : 2023-06-01 DOI: 10.1680/jgere.2023.10.2.49

D. E. L. Ong, Md Mizanur Rahman

引用次数: 0

Effects of organic content on sewage sludge compression behaviour 有机物含量对污泥压缩性能的影响

IF 1.9

Geotechnical Research Pub Date : 2023-05-24 DOI: 10.1680/jgere.23.00004

Ruixing Yang, Ren-wei Wei, Zhen-ning Zhang, Teng-long Zheng

{"title":"Effects of organic content on sewage sludge compression behaviour","authors":"Ruixing Yang, Ren-wei Wei, Zhen-ning Zhang, Teng-long Zheng","doi":"10.1680/jgere.23.00004","DOIUrl":"https://doi.org/10.1680/jgere.23.00004","url":null,"abstract":"Five sewage sludge specimens with different organic contents were prepared by mixing mass ratio 0%, 5%, 10%, 20% and 40% of dry soil powder into raw sewage sludge. The addition of dry soil powder can reduce the organic content of sewage sludge without significantly changing its particle composition. Oedometer tests were conducted, starting from a small effective vertical stress σ v′ = 3 kPa. It is observed that the e-logσ v′ compression curves show an inverse ‘S’ shape due to suction pressure resisting deformation. The suction pressure decreases exponentially with the organic content, a regressed equation for which has been provided. Burland’s concept of intrinsic compression line (ICL) is adopted for correlating the compression curves of sludgewith various organic contents. It is found that the ICL with high organic content lies above the low one, that is, the higher the organic content, the greater the void index. In addition, the shape of the ICL for organic sludges is an inverse ‘S’ rather than slightly concave upwards for inorganic reconstituted clays. An average ICL is provided to normalize the compression curves of sludges with different organic contents. The intrinsic compression parameters e * 100 and C c * can be correlated with the organic content, which increase linearly with the organic content, and the regressed equations for them were provided.","PeriodicalId":44054,"journal":{"name":"Geotechnical Research","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44311328","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

Testing of a modified low-mobility grout material for permeation grouting in embankment dams 用于堤坝渗透灌浆的改良低流动性灌浆材料的试验

IF 1.9

Geotechnical Research Pub Date : 2023-05-22 DOI: 10.1680/jgere.22.00066

Johan Lagerlund, J. Laue, P. Viklander, Erik Nordström

引用次数: 0

Rigid circular footing on the surface of a transversely isotropic linear elastic half-space 横观各向同性线弹性半空间表面上的刚性圆形基脚

IF 1.9

Geotechnical Research Pub Date : 2023-03-27 DOI: 10.1680/jgere.22.00064

E. Dean

{"title":"Rigid circular footing on the surface of a transversely isotropic linear elastic half-space","authors":"E. Dean","doi":"10.1680/jgere.22.00064","DOIUrl":"https://doi.org/10.1680/jgere.22.00064","url":null,"abstract":"It is sometimes convenient to treat a relatively rigid footing as a single element subjected to up to six force-resultants: vertical load, horizontal load in two directions, overturning moment about two axes, and torsion. Applications include calculations of initial, elastic settlement; foundation responses under seismic loading or for machine vibrations; and fixity of an offshore jackup foundation under cyclic wave loading. Present codes of practice provide formulae that assume fully isotropic and linear elastic soil, and in some case assume no friction between footing and soil. This paper uses recent theoretical advances to develop solutions for stiffnesses of rigid circular footings on transversely isotropic linear elastic soil, including with interface friction. Closed form solutions are developed for vertical load and overturning moment on a frictionless interface, and for vertical load and torsion on a frictional interface. A boundary element analysis is presented for the cases of lateral load and overturning moment on a frictional interface. By fitting expected forms to the results, new formulae are proposed for stiffnesses for these cases. Effects of interface friction on limiting loads are calculated. Practical applications are outlined, and some limitations are briefly discussed.","PeriodicalId":44054,"journal":{"name":"Geotechnical Research","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49534203","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

Point loads on the surface of a transversely isotropic linear elastic half-space 横向各向同性线性弹性半空间表面上的点荷载

IF 1.9

Geotechnical Research Pub Date : 2023-03-27 DOI: 10.1680/jgere.22.00063

E. Dean

引用次数: 2