Soils and Rocks最新文献

Discussion of “Systematic literature review and mapping of the prediction of pile capacities” 关于 "系统文献综述和桩基承载力预测绘图 "的讨论

IF 0.5

Soils and Rocks Pub Date : 2024-01-09 DOI: 10.28927/sr.2024.011123

Katia Bicalho, Reno Castello, Nelson Aoki

引用次数: 0

Primary consolidation settlement due to ramp loading: Terzaghi (1943) method revisited 坡道荷载引起的原生固结沉降：Terzaghi (1943) 方法再探讨

IF 0.5

Soils and Rocks Pub Date : 2024-01-09 DOI: 10.28927/sr.2024.003522

Vitor Albuquerque, Celso Romanel, Raphael Carneiro

引用次数: 0

Behavior of clayey soil treated with nano magnesium oxide material 用纳米氧化镁材料处理粘性土壤的行为

IF 0.5

Soils and Rocks Pub Date : 2023-12-14 DOI: 10.28927/sr.2024.014822

Zeena Al-Khazzaz, A. Aldaood, Muwafaq Awad, Mohammed Faris

{"title":"Behavior of clayey soil treated with nano magnesium oxide material","authors":"Zeena Al-Khazzaz, A. Aldaood, Muwafaq Awad, Mohammed Faris","doi":"10.28927/sr.2024.014822","DOIUrl":"https://doi.org/10.28927/sr.2024.014822","url":null,"abstract":"Clayey soils are spread in many countries and require significant improvement. Recently, nanomaterial have been entered to the geotechnical research as a treatment material. Current study utilized magnesium oxide (MgO) as an additive to enhance swelling potential, compressibility characteristics, and index properties of clayey soil from Mosul city using different content of nano-MgO and under varies curing periods. The results showed that the free swell and swell pressure of the soil specimens have been reduced by 25%, and 19%, respectively for 0.25, and 0.75% content of nano material under 3 days of curing time at 25C. Results also showed that the compressibility characteristic represented by the compression index parameter has been reduced by 20.3% for 0.75% of nano-MgO material. Moreover, the soil plasticity index exhibited a maximum increase at 0.75% of nano content. Moreover, results showed that the pH value increased while the electrical conductivity (EC) decreased with the nano-MgO content. To evaluate the curing time effect, specimens were cured for varies curing time under curing temperature of 25 ºC. Then, the free swell, swell pressure, compression index, and Atterberg limits were measured. The results revealed that the free swell and swell pressure for both untreated and treated specimens were reduced during different periods of curing time. Furthermore, the compression index of treated soil was reduced by approximately half for curing time of 28 days. In sum, the swelling and consolidation reduction with curing brought significant improvement and promising results for the treated samples.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":"12 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138972981","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 the behavior of a surface foundation located in the proximity of a slope 斜坡附近地表地基行为的数值模拟

IF 0.5

Soils and Rocks Pub Date : 2023-12-14 DOI: 10.28927/sr.2024.008722

Bencheikh Messaouda, Aidoud Assia, Boukour Salima, Khaldi Nacera, Belabed Lazhar

{"title":"Numerical modeling of the behavior of a surface foundation located in the proximity of a slope","authors":"Bencheikh Messaouda, Aidoud Assia, Boukour Salima, Khaldi Nacera, Belabed Lazhar","doi":"10.28927/sr.2024.008722","DOIUrl":"https://doi.org/10.28927/sr.2024.008722","url":null,"abstract":"Some foundations are placed on or near slopes or excavations, such as roads in mountainous areas, tower footings for power lines, and bridge abutments. The design of foundation under these conditions is complex and the studies available in this regard are limited and concerned mostly about the determination of the reduction of the bearing capacity coefficients associated with the presence of the slope except for Meyerhof who was a pioneer in developing a theory in 1957 to determine the ultimate bearing capacity of a foundation near a slope. However, the theory was independent of the slope inclination. In this study, we attempted to numerical modeling of the behavior of a shallow foundation using the finite element technique together with Plaxis 8.2 software to simulate the case of a foundation near a slope, in terms of examining the bearing capacity of the foundation for given slope features, soil characteristics and geometry conditions located near a slope subjected to a centered and / or eccentric load. The results obtained confirm that the position of the eccentricity of the load relative to the head of the slope has a significant effect on the bearing capacity. Indeed, it becomes larger when the eccentricity is located far from the crest of the slope. Thus, the bearing capacity of a footing subjected to a centered load (e/B = 0) is greater than that of the same footing subjected to an eccentric load (e/B = 0.1). It is noted that the results obtained from the present study are in good agreement with those of the literature.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":"465 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138974249","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

Analysis of sorption/desorption of cadmium and lead in the legal amazon soils 亚马逊法定土壤中镉和铅的吸附/解吸分析

IF 0.5

Soils and Rocks Pub Date : 2023-12-14 DOI: 10.28927/sr.2024.014022

Nicoly Rocha, Claudio Mahler

{"title":"Analysis of sorption/desorption of cadmium and lead in the legal amazon soils","authors":"Nicoly Rocha, Claudio Mahler","doi":"10.28927/sr.2024.014022","DOIUrl":"https://doi.org/10.28927/sr.2024.014022","url":null,"abstract":"Sorption and desorption tests were carried out for competitive and non-competitive systems with isotherms to verify the presence of Cd and Pb in soils. The soils investigated were: (i) with natural content of organic matter and (ii) with residual content of organic matter. Hydrated nitrate salts of Cd and Pb diluted in 0.01 M calcium nitrate solution in six concentrations were used for the Cd solutions and, for the solutions of Pb, five concentrations. For multielement solutions, mixtures of the simple Cd and Pb solutions in a 1:1 ratio were used. The results of the first stage tests (i) showed good adjustments of the experimental data to the isotherms of Langmuir, Freundlich and Linear, which did not occur for the tests in stage (ii). According to the tests (i), the organic matter was the soil attribute of dominant influence in the sorting mechanisms. The parameters Qo and Kd were adequate to evaluate the adsorption of the studied metals, especially Cd. In step (ii), there was a significant increase in metal retention, especially for element Pb in the samples of Haplic Cambisol (AM) and Red-Yellow Latosol1 (RO), justified by the combined action of (1) increasing the surface area of the mineral fraction, previously covered by organic matter; and (2) increase in soil pH. The Cd element was more bioavailable in relation to the Pb. This was confirmed by the high desorption values observed for Cd. The samples of Haplic Cambisol and Red-Yellow Latosol demonstrated greater capacity to retain Cd and Pb.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":"2020 9","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139001966","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

Comparative evaluation of constitutive models for stress-strain analysis of an iron ore tailings from the Quadrilátero Ferrífero, Minas Gerais, Brazil 对巴西米纳斯吉拉斯州费里费罗四角铁矿尾矿应力应变分析构成模型的比较评估

IF 0.5

Soils and Rocks Pub Date : 2023-12-12 DOI: 10.28927/sr.2024.011022

André Faria, B. Delgado, Lucas Ferreira, Mauro Santos Junior

{"title":"Comparative evaluation of constitutive models for stress-strain analysis of an iron ore tailings from the Quadrilátero Ferrífero, Minas Gerais, Brazil","authors":"André Faria, B. Delgado, Lucas Ferreira, Mauro Santos Junior","doi":"10.28927/sr.2024.011022","DOIUrl":"https://doi.org/10.28927/sr.2024.011022","url":null,"abstract":"The study and understanding of the concepts related to critical state soil mechanics is relatively recent in Brazil, especially among practicing geotechnical engineers in the mining industry, where simpler solutions were traditionally adopted. This raises the necessity to develop studies capable of promoting discussions about the benefits of the approaches from the critical state theory. In this context, this research aims to evaluate the behavior of an iron ore tailings from the Quadrilátero Ferrífero through critical state computational models, considering the Modified Cam-Clay and NorSand model. The numerical results from the use of the models simulated the ductile/brittle behavior of the material in drained shear and it was observed that for loose samples both models produced similar results. The simulations in undrained shear, on the other hand, highlighted the differences between the models, with the NorSand showing a strength loss in undrained shear (strain-softening) whereas the Modified Cam-Clay Model exhibited a ductile behavior. In general, the NorSand model was the one that presented the best numerical response in relation to the experimental behavior, which may be linked to the use of the largest number of parameters, to the concept that particulate materials exist in a set of states and the silty characteristic of the material. Additionally, it was observed the difficulty to simulate the dense behavior of materials with the model, which may be associated with the formation of ‘shear bands’ during the experimental test and the complexity of modeling the occurrence of this phenomenon in virtual tests using the NorSand model.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":"48 9","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139006876","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

Experimental study on mechanical behavior deterioration of undisturbed loess considering freeze-thaw action 考虑冻融作用的未扰动黄土力学行为退化试验研究

IF 0.5

Soils and Rocks Pub Date : 2023-12-12 DOI: 10.28927/sr.2024.005822

Shuangshuang Yang, Yaling Chou, Li-jie Wang, Peng Zhang

{"title":"Experimental study on mechanical behavior deterioration of undisturbed loess considering freeze-thaw action","authors":"Shuangshuang Yang, Yaling Chou, Li-jie Wang, Peng Zhang","doi":"10.28927/sr.2024.005822","DOIUrl":"https://doi.org/10.28927/sr.2024.005822","url":null,"abstract":"To solve the problem that the mechanical behavior of undisturbed loess in seasonally frozen soil area is affected by freeze-thaw action, triaxial shear tests of undisturbed loess under freeze-thaw condition were carried out. The results show that the mechanical properties of undisturbed loess are greatly affected by factors including freeze-thaw process, water content, natural density and confining pressure. Freeze-thaw action has a certain impact on the failure surface shape and stress-strain curve. Before and after freeze-thaw, the shape of the shear failure surface is complex, including single oblique failure surface, double oblique failure surface, vertical failure surface, X-shaped failure surface, bulging failure, etc. And under the conditions of low water content, low confining pressure and high dry density, the stress-strain curve tends to be softened. Conversely, the curve tends to harden. Freeze-thaw action can make the stress-strain curve transition from softening to hardening. In addition, the freeze-thaw action significantly weakens the failure strength, shear strength, cohesion, initial tangent modulus and failure ratio of undisturbed soil, but does not change the internal friction angle obviously. Also, the heterogeneity of natural soil is also an important factor affecting the mechanical parameters, failure surface shape and stress-strain curve of undisturbed loess.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":"1 9","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139008842","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

Effects of wetting and drying cycles on the swelling pressure and free swelling of expansive soil 干湿循环对膨胀土膨胀压力和自由膨胀的影响

Soils and Rocks Pub Date : 2023-11-03 DOI: 10.28927/sr.2024.011122

Larissa Oliveira, Erinaldo Cavalcante

引用次数: 0

The use of a video and a small-scale model for rain-induced landslides in geotechnical engineering education 在岩土工程教育中使用录影带及小型模型模拟雨水引致的山崩

Soils and Rocks Pub Date : 2023-10-19 DOI: 10.28927/sr.2024.006623

Marcos Mendonça

{"title":"The use of a video and a small-scale model for rain-induced landslides in geotechnical engineering education","authors":"Marcos Mendonça","doi":"10.28927/sr.2024.006623","DOIUrl":"https://doi.org/10.28927/sr.2024.006623","url":null,"abstract":"Small-scale physical models of geotechnical problems are thought-provoking didactic tools that motivate students by arousing their curiosity and facilitating the understanding of physical phenomena and theoretical concepts. This work presents the development of an educational video about slope stability failures and its contributing factors. It shows several small-scale models built in a glass wall tank measuring 150 x 50 x 10 cm. Layers of fine gravel were placed on a sloping surface of polystyrene to represent a slope with a layer of residual soil on rock. Toy houses and cars were used to represent anthropogenic agents, and water with dye represents the groundwater flow. Each model depicts a different scenario of shallow slope failure. The objective of the video is to show that most slope failures in urban areas result from natural and anthropogenic factors. Several influence factors are shown: porewater level rise, excavation, surcharge application, and solid urban waste deposition. The 6-minute video has had more than 130,000 views on YouTube. Thanks to its simple and concise language, the video is shown in basic education and science museum, as well as in graduate and undergraduate courses. A questionnaire survey was carried out with undergraduate students to assess how helpful the video was for the learning process. This article explains the construction of the model, the video script, and the strategies for its use, as well as its reception. It was found that the video promoted motivational and learning benefits of providing context, establishing relevance, and teaching inductively.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135668079","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

Methodological teaching-learning experiments applied to Geotechnical Engineering 方法教学实验在岩土工程中的应用

Soils and Rocks Pub Date : 2023-10-19 DOI: 10.28927/sr.2024.004523

Silvio Ferreira

{"title":"Methodological teaching-learning experiments applied to Geotechnical Engineering","authors":"Silvio Ferreira","doi":"10.28927/sr.2024.004523","DOIUrl":"https://doi.org/10.28927/sr.2024.004523","url":null,"abstract":"The use of problem-based and project-based learning is beneficial. The teaching-learning process requires the development of a critical, objective, and rational mind. This paper analyzes methodological experiments from the teaching-learning process carried out in the geotechnical area of the civil engineering program at three universities in the state of Pernambuco, Brazil, for more than 40 years. Three integrated experiments are presented. In the first experiment, undergraduate students in geotechnical engineering courses interacted with companies operating in the area, conducting laboratory and field tests and geotechnical instrumentation. The second experiment integrated students and teachers from different areas of the civil engineering program around a multidisciplinary project, while the third brought together undergraduate and graduate (master and doctoral) student research activities into a single project that extends from the development and construction of geotechnical equipment and applications of new soil improvement techniques to land use planning and occupation. )This study demonstrated the use of positive teaching-learning experiences carried out in the teaching of geotechnical engineering in the development of civil engineers who have technical skills and professional competences. It contributed to the advancement of knowledge in the development of new equipment, soil improvement, testing techniques and in the use, planning and occupation of soils. The interaction between the university, society and government institutions in problem solving also contributed.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":"16 14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135729026","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