Geotechnical Testing Journal最新文献

{"title":"Utilization of Granular Wastes in Transportation Infrastructure","authors":"Buddhima Indraratna, Chathuri M. K. Arachchige, Cholachat Rujikiatkamjorn, Ana Heitor, Yujie Qi","doi":"10.1520/gtj20220233","DOIUrl":"https://doi.org/10.1520/gtj20220233","url":null,"abstract":"","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135790591","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}

{"title":"An Experimental Study on Excess Pore-Water Pressure Generation of a Poorly Graded Sand Using Combined RCTS Device","authors":"Zhongze Xu, Shiyuan Li, Yaning Wang, Benchen Zhang, Kenneth H. Stokoe","doi":"10.1520/gtj20220237","DOIUrl":"https://doi.org/10.1520/gtj20220237","url":null,"abstract":"","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135477162","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}

{"title":"Dynamic Mechanical Analysis Test for Evaluating Loose Sands on a Wide Strain Range—Application to the InSight Mission on Mars","authors":"María Juliana Chaparro López, Juan-Pablo Castillo-Betancourt, Miguel Cabrera, Bernardo Caicedo, Pierre Delage, Philippe Lognonné, Bruce Banerdt","doi":"10.1520/gtj20230381","DOIUrl":"https://doi.org/10.1520/gtj20230381","url":null,"abstract":"The dynamic properties of loose sands under low stresses are an unexplored topic in soil dynamics because these soil conditions are uncommon in most geotechnical structures on Earth. However, low densities and low-stress conditions prevail on other planets, like, for instance, the surface of Mars, for which particular attention is presently given through the InSight NASA mission. This work presents a new procedure for measuring the dynamic properties of loose sand under low stress by using the dynamical mechanical analysis (DMA) tester, a technique commonly used in asphalt engineering but not in geotechnical engineering. Compared to traditional geotechnical methods (resonant column and cyclic triaxial tests), DMA investigates a broader range of strains using a single apparatus. In this work, we assess the dynamical properties of loose fine sand Dr ≈ 0.2, considered a possible Mars regolith analog, by varying the input strain from γ = 10−6 to γ = 10−2 while applying confining pressures from σ3 = 3 kPa to σ3 = 30 kPa. The results validate the proposed procedure, showing an increment of the shear modulus as the confining pressure increases. Furthermore, they highlight DMA’s advantages for studying the dynamic properties of granular soils under low stress and strain.","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136263671","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}

{"title":"Model Testing of Rock-Socketed Piles under Combined Vertical–Lateral Loading","authors":"A. P. Singh, K. Seshagiri Rao, Ramanathan Ayothiraman","doi":"10.1520/gtj20220173","DOIUrl":"https://doi.org/10.1520/gtj20220173","url":null,"abstract":"This paper presents the findings from a model experimental setup designed and fabricated for conducting single gravity (1-g) model experiments on model aluminum instrumented piles embedded in synthetic rock subjected to both independent vertical–compressive and lateral loading and combined vertical–compressive and lateral loading. Synthetic rock was prepared based on a mix design that can simulate the strength and modulus of soft rocks. Model tests were carried out on single piles of different socketing lengths (L/D ratios: 6, 9, and 12). Combined loading tests were done such that the resultant of the vertical–compressive and lateral loads was at constant inclinations (30° and 60°). Piles with smooth and rough surfaces were simulated for examining the effect of the pile–rock roughness profile. The vertical load–settlement and the lateral load–deflection response were measured from the tests. The bending behavior of piles under both independent and combined loading was also measured. The deflection profile of the rock-socketed pile was obtained by tracing the tested/failed piles after extracting them. The axial and lateral resistance of the rock-socketed piles are interpreted and discussed. It is observed that the rock-socketed piles behave in a distinctly different manner under combined loading compared with independent loading.","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010775","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}

{"title":"Performance Evaluation of Coal Gangue-GGBS–Based Geopolymer for Treating Black Cotton Soil","authors":"Aravind Gaddam, Sudheer Kumar Yamsani","doi":"10.1520/gtj20220251","DOIUrl":"https://doi.org/10.1520/gtj20220251","url":null,"abstract":"Black cotton soils are extremely problematic because they are susceptible to large volume changes with variation in moisture contents. These soils are conventionally stabilized with ordinary portland cement and lime, but the production/utilization of these traditional stabilizers is highly energy intensive, involves quarrying, and emits large quantities of carbon dioxide (CO2) into the atmosphere. Geopolymer is a promising alternative to these stabilizers because it provides high strength, consumes low energy, and emits low CO2 during synthesis and application. In this study, geopolymers synthesized from coal gangue (waste generated during coal mining) and ground granulated blast furnace slag (GGBS; by-product from the iron and steel industry) binders were evaluated for treating black cotton soil. A mixture of sodium silicate and sodium hydroxide is used as an alkaline activator solution for geopolymerization. An attempt is further made to identify the optimal dosages of geopolymer by evaluating the strength and durability characteristics of geopolymer-treated black cotton soil mixtures. X-ray diffraction and scanning electron microscopy were further conducted to distinguish the mineralogical and microstructural changes that occurred because of geopolymerization. From this study, it is found that using coal gangue alone as a precursor in geopolymer is good at improving the strength of black cotton soil but observed to be weak in durability. Hence, an attempt is further made to synthesize a better-performing geopolymer with a combination of GGBS and coal gangue, i.e., effective in both strength and durability aspects. Optimal geopolymer identified in this study can be a sustainable alternative to traditional stabilizers in improving black cotton soils for geotechnical subgrade applications.","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010777","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}

{"title":"Laboratory Fatigue Characterization of Foamed Bitumen Stabilized Granular Base and Recycled Blends for Pavements","authors":"Negin Zhalehjoo, Didier Bodin, Geoffrey Jameson, Andrew Papacostas, Ross Guppy","doi":"10.1520/gtj20230323","DOIUrl":"https://doi.org/10.1520/gtj20230323","url":null,"abstract":"Foamed bitumen stabilization offers a sustainable solution for the construction of new pavements or rehabilitation treatments while also improving the performance of pavement structures. This technique allows up to 100 % of the existing pavements to be used, which will lead to lower use of quarry resources and reduced material transportation cost. In recent years, there have been advances in the use of foamed bitumen stabilized (FBS) pavements. However, prior to the research in this paper, no specific Australian performance relationship had been developed for FBS materials. Also, there was a lack of test procedures specifically developed to manufacture and evaluate the fatigue cracking resistance of FBS conventional and recycled pavement materials. This paper presents the laboratory characterization and development of a fatigue relationship to predict performance of FBS materials. For this purpose, laboratory experiments were undertaken including flexural fatigue, modulus, and strength tests using a four-point bending beam system. Five different host materials were selected for laboratory investigations, including three crushed rocks and two recycled blends incorporating 50 % reclaimed asphalt pavement and 80 % recycled cement–treated crushed rock. A total of eight FBS mixes were tested with varying host materials, foamed bitumen content from 2 to 4 %, and hydrated lime content of 1 or 2 %. A testing procedure to measure and analyze the fatigue performance of FBS granular base and recycled blends was produced. Using the laboratory test results, a specific laboratory fatigue relationship for FBS materials, including recycled blends, is developed. The flexural modulus, flexural strength-to-modulus ratio, and volume of bitumen were found to be major parameters affecting the fatigue life of FBS materials and were consequently employed to develop the predictive model. This research will assist with the subsequent development of a performance-based in-service fatigue model for thickness design of FBS flexible pavements.","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010776","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}

{"title":"Experimental Investigation on the Post-liquefaction Behavior of Sands in Simple Shear Conditions","authors":"Lucia Mele, Stefania Lirer, Alessandro Flora","doi":"10.1520/gtj20230306","DOIUrl":"https://doi.org/10.1520/gtj20230306","url":null,"abstract":"Experimental evidence shows that earthquake induced liquefaction can occur more than once in sandy soils. Moreover, despite an increase in soil density caused by the dissipation of the excess pore pressure induced by earthquakes, the liquefaction resistance of soils that have experienced liquefaction may be lower than that of virgin soils. This paper offers insight into this topic starting from the analysis of the undrained monotonic behavior of post-liquefied sands by means of tests performed with a simple shear cell equipped with flexible boundaries, which maintains a constant diameter to guarantee the “K0-condition.” The control system of cyclic, reconsolidation, and monotonic phases is described in detail. The experimental results show that neither the relative density, effective confining stress, cyclic stress ratio, nor the direction of shear strain play important roles in the monotonic behavior of post-liquefied soils. Moreover, the comparison between the monotonic response of virgin and post-liquefied soils (prepared by moist tamping technique) shows that it is not affected by the stress–strain history experienced by soils. It can be explained through a microstructural interpretation. According to which, the initial soil fabric generated with the moist tamping method and that formed during liquefaction remain almost unchanged because of the rotation of principal stress directions occurring during simple shear tests. A further confirmation is given by the results of tests performed on specimens prepared by air pluviation method.","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135110419","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}

{"title":"Characterization of the Rate-Dependent Behavior of a High-Plasticity Stiff Sedimentary Clay","authors":"Kenny K. Sorensen, Victor K. H. Nielsen, Astrid R. Mikkelsen, Hans H. Stutz","doi":"10.1520/gtj20230339","DOIUrl":"https://doi.org/10.1520/gtj20230339","url":null,"abstract":"This study investigates the influence of structure and stress history on the strain-rate-dependent (viscous) stress–strain behavior of a very-high-plasticity stiff sedimentary clay. Oedometer, ring shear, and triaxial compression tests with step changes in strain rate have been conducted on specimens of Søvind Marl with the aim to characterize and quantify the rate-dependent behavior of the clay in both compression and shearing pre-peak, post-peak, and at residual state. Moreover, from a comparison of intact specimens and normally consolidated and overconsolidated reconstituted specimens, the influence of diagenesis and mechanical overconsolidation on the rate-dependent behavior is assessed and discussed in the light of findings from similar studies on other high-plasticity clays.","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135353535","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}

{"title":"Triaxial Testing Methodology for Gassy Soils","authors":"Pauline Kaminski, Jürgen Grabe","doi":"10.1520/gtj20230296","DOIUrl":"https://doi.org/10.1520/gtj20230296","url":null,"abstract":"Small amounts of gas occur in almost every sediment in marine or coastal environments. In past studies, a negative influence of gas on the mechanical properties of soil was associated with geohazard occurrence and dike safety in tide affected areas. However, the impact of a homogeneous distribution of gas bubbles in soil on its mechanical properties has not yet been thoroughly understood. In order to further investigate and improve our understanding of the shear strength of gassy soils, an experimental setup and a sample preparation procedure to implement the axis-translation method were developed. To this end, a temperature-controlled triaxial apparatus was specially modified. The triaxial apparatus is supplemented by a circulation system, required for the preparation of gassy samples with a homogeneous gas bubble distribution. In the circulation system, a defined quantity of carbon dioxide gas is dissolved in water. During the test procedure, the carbonated water is circulated into a saturated sample via a pressure gradient between the sample top and bottom. A subsequent unloading, tailored to the previously dissolved gas quantity, leads to gas exsolution in the sample. As a result, a defined degree of saturation can be generated within the triaxial apparatus. This experimental procedure represents a nondestructive technique for the preparation of gassy soil samples that is not limited to specific soil types. Triaxial shear tests on these samples extend our knowledge on the stress–strain behavior of gassy soils and thus provide a basis for future research, e.g., in the field of constitutive modeling.","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135353536","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}

{"title":"Stabilization of Soft Clay with Sustainable Binders for Dry Deep Mixing Design","authors":"Alejandra López Ramírez, Yinning Zhang, Juha Forsman, Leena Korkiala-Tanttu","doi":"10.1520/gtj20220255","DOIUrl":"https://doi.org/10.1520/gtj20220255","url":null,"abstract":"","PeriodicalId":55099,"journal":{"name":"Geotechnical Testing Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135490860","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}