Soils and Rocks最新文献_第10页

An evaluation of reinforcement mechanical damages in geosynthetic reinforced piled embankments 土工合成筋桩路堤钢筋力学损伤评价

IF 0.5

Soils and Rocks Pub Date : 2022-07-09 DOI: 10.28927/sr.2022.000522

E. Palmeira, José Melchior Filho, Ewerton C. A. Fonseca

{"title":"An evaluation of reinforcement mechanical damages in geosynthetic reinforced piled embankments","authors":"E. Palmeira, José Melchior Filho, Ewerton C. A. Fonseca","doi":"10.28927/sr.2022.000522","DOIUrl":"https://doi.org/10.28927/sr.2022.000522","url":null,"abstract":"The use of geosynthetic reinforcement in piled embankments over soft soils is an effective solution for the reduction of settlements and to increase the embankment stability. The most efficient position for the reinforcement layer is on the pile cap or head. However, a direct contact of the reinforcement with sharp edges may damage it, compromising its efficiency to transfer loads to the piles. This paper investigates the possibility of mechanical damages in geosynthetic reinforcements on pile caps by large scale laboratory tests. Tests with and without pieces of nonwoven geotextile protective layer between the caps and the reinforcements were executed. Wide strip tensile tests were performed on exhumed reinforcement specimens after the tests to assess tensile strength and stiffness variations. A statistical analysis of the results shows reductions in tensile strength of unprotected reinforcement layers of up to 28%. A mechanical damage index is introduced and its correlation with calculated reduction factors is investigated. The use of a piece of a thick geotextile layer to protect the reinforcement against mechanical damage can be effective. However, the geotextile product must be properly specified and installed with due care.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44352166","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

A case study of bearing capacity of piles partially embedded in rock 部分嵌岩桩承载力实例研究

IF 0.5

Soils and Rocks Pub Date : 2022-07-09 DOI: 10.28927/sr.2022.075521

Marília Silva, R. Coutinho, B. Danziger

{"title":"A case study of bearing capacity of piles partially embedded in rock","authors":"Marília Silva, R. Coutinho, B. Danziger","doi":"10.28927/sr.2022.075521","DOIUrl":"https://doi.org/10.28927/sr.2022.075521","url":null,"abstract":"In the design of piles partially embedded in rock, the main factors that influence the strength and deformability of the rock and the transmission of loads from pile to rock are of utmost relevance to pile behavior. Most empirical methods were developed based on data from specific regions. Differences in geological conditions, drilling methods and other features are not considered in most procedures. The article deals with a case of piles partially embedded in rock located in the town of São Lourenço da Mata, Pernambuco, Brazil. The rock mass consists of ancient deposits, formed mainly by granites of different compositions, gneiss and schists. The deposits have been deformed by several tectonic processes. Results from 99 dynamic loading tests enabled comparison between the mobilized lateral and pile toe resistance, with the estimated capacity obtained from the design methods known in the literature. In the prediction, the lateral shear resistance due to pile penetration in residual soil was also considered. Because failure was not reached in the dynamic tests, the estimated capacity was higher than the mobilized resistance. The resistances mobilized by the pile shaft friction in soil, by the pile shaft friction in rock and by the mobilized toe resistance in rock in the dynamic loading tests are compared to design methods known in the literature. Five static loading tests indicated failure loads greater than the mobilized resistance in the dynamic methods. The comparisons allow recommendations of the most consistent design methods to use in similar cases in practice.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42518994","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

Geotechnical characterization of the estuarine deltaic deposits in the Guayaquil city through in situ and laboratory tests 通过现场和实验室试验对瓜亚基尔市河口三角洲沉积物的岩土工程特征进行了研究

IF 0.5

Soils and Rocks Pub Date : 2022-07-09 DOI: 10.28927/sr.2022.074021

Bosco Álvarez, Hernández Palma, D. Besenzon, X. Vera-Grunauer, S. Amoroso

{"title":"Geotechnical characterization of the estuarine deltaic deposits in the Guayaquil city through in situ and laboratory tests","authors":"Bosco Álvarez, Hernández Palma, D. Besenzon, X. Vera-Grunauer, S. Amoroso","doi":"10.28927/sr.2022.074021","DOIUrl":"https://doi.org/10.28927/sr.2022.074021","url":null,"abstract":"According to previously available research and seismic microzonation studies a large area of the Guayaquil (Ecuador, South America) sits on estuarine deltaic deposits which consist of weak and highly compressible clays with diatoms. The nature of these fine-grained deposits may determine difficulties in a proper estimation of the soil properties. In this respect, the paper provides a detailed geotechnical and geophysical characterization of these soft clays, carried out in the estuarine complex of the Ecuadorean city. Borehole logs, standard penetration tests (SPT), piezocone tests (CPTu), a seismic dilatometer test (SDMT), a non-invasive geophysical survey, and laboratory tests were performed and then compared to analyze the static and dynamic geotechnical parameters of these deposits. The interpretation of the results highlighted the higher reliability of CPTu and SDMT rather than SPT and characterization lab testing to estimate soil shear strength, compressibility and stress history due to the soft nature of these clays, underlining also a certain sensitivity to the presence of the diatoms.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42658180","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

Vacuum preloading and PVDs in soft soils beneath embankments: 3D coupled analysis incorporating overall stability study 路堤下软土的真空预压和PVD：结合整体稳定性研究的三维耦合分析

IF 0.5

Soils and Rocks Pub Date : 2022-07-09 DOI: 10.28927/sr.2022.072821

J. Borges

引用次数: 0

Contaminant transport model in transient and unsaturated conditions applied to laboratory column test with tailings 瞬态非饱和条件下污染物输运模型在室内尾砂柱试验中的应用

IF 0.5

Soils and Rocks Pub Date : 2022-05-09 DOI: 10.28927/sr.2022.076021

Eliu Carbaja, Mariana Diniz, R. Rodríguez-Pacheco, A. Cavalcante

{"title":"Contaminant transport model in transient and unsaturated conditions applied to laboratory column test with tailings","authors":"Eliu Carbaja, Mariana Diniz, R. Rodríguez-Pacheco, A. Cavalcante","doi":"10.28927/sr.2022.076021","DOIUrl":"https://doi.org/10.28927/sr.2022.076021","url":null,"abstract":"Mining is an important economic activity in the modern world. However, despite the generated benefits, mining produces tremendous volumes of tailings, an environmental liability with numerous adverse effects. Researches about contaminant transport in tailings dam are important to assess the degree of contamination and to propose preventive or remedial measures. In geotechnical practice, the flow of solutes is generally characterized by numerical solution of the Richards equation to describe water movement followed by advection-dispersion equation to describe contaminant movement. This study aimed to model and simulate contaminant transport in a laboratory column test, using a new analytical formulation and mathematical codes, through tailings in transient unsaturated conditions. The analytical solution for the Richards equation was used to simulate the variation in the volumetric water content and to determine the transient contaminant plume using the advection-dispersion equation subsequently. The models were used to calibrate experimental data from hydraulic characterization and contamination tests. Finally, the normalized contaminant plume (cw/c0) was simulated as a function of time and space. Comparisons with experimental data showed that the analytical formulations adequately expressed the process of contaminant infiltration through the unsaturated porous medium. The formulations offered effectively and are configured as a new approach to solve various contamination problems in transient unsaturated conditions, providing insights into many complex processes that occur in the lab tests and requires far less computational effort compared with current programs to modeling the solute transport using numerical solutions, as the versatile commercial Software HYDRUS.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47912570","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

Effect of engineering geological properties on dam type selection of the Qadis Khordak Dam, Afghanistan 工程地质性质对阿富汗Qadis Khordak大坝坝型选择的影响

IF 0.5

Soils and Rocks Pub Date : 2022-05-03 DOI: 10.28927/sr.2022.070621

Sayed Alipoori, G. Lashkaripour, M. Ghafoori, N. Moghadas

引用次数: 1

Influence of addition of butadiene copolymer and modified styrene on the mechanical behavior of a sand 丁二烯共聚物和改性苯乙烯的加入对砂力学性能的影响

IF 0.5

Soils and Rocks Pub Date : 2022-05-03 DOI: 10.28927/sr.2022.074521

Thiago Barreto, L. Repsold, N. G. Souza e Silva, M. Casagrande

引用次数: 3

Behavioural analysis of iron ore tailings through critical state soil mechanics 基于临界状态土力学的铁矿尾矿特性分析

IF 0.5

Soils and Rocks Pub Date : 2022-04-21 DOI: 10.28927/sr.2022.071921

J. P. Silva, P. Cacciari, V. Torres, L. F. Ribeiro, A. Assis

{"title":"Behavioural analysis of iron ore tailings through critical state soil mechanics","authors":"J. P. Silva, P. Cacciari, V. Torres, L. F. Ribeiro, A. Assis","doi":"10.28927/sr.2022.071921","DOIUrl":"https://doi.org/10.28927/sr.2022.071921","url":null,"abstract":"Understanding the geotechnical properties of iron ore tailings is currently one of the major challenges in the mining industry. With transitions from drained to undrained conditions occurring in seconds, recent dam problems have been a challenge to solve with classical soil mechanics, which provides few means to explain how such phenomena develop. There is also an increasing propensity in technical and scientific circles to seek constitutive models that are based on critical state soil mechanics and that allow for the analysis of tailings behaviour. However, there is still a lack of knowledge and information about the critical state properties of iron ore tailings. The present research experimentally and numerically investigated the effectiveness of modelling the behaviour of iron ore tailings. The aim of these experiments was to assess the critical state parameters of tailings from a significant iron ore operation site in Quadrilátero Ferrífero (Minas Gerais state, Brazil). The results indicated that the selected numerical model (NorSand) was adequate to evaluate the behaviour of the studied mine tailings. The numerical results showed consistent adherence to the experimental results of both drained and undrained tests, with deformations below 5% and samples in which the state parameter had a small magnitude.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44720301","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

Automated true triaxial apparatus development for soil mechanics investigation 用于土壤力学研究的真三轴仪的自动化开发

IF 0.5

Soils and Rocks Pub Date : 2022-04-19 DOI: 10.28927/sr.2022.077321

Dionatas Andreghetto, L. Festugato, G. Miguel, Andressa Silva

{"title":"Automated true triaxial apparatus development for soil mechanics investigation","authors":"Dionatas Andreghetto, L. Festugato, G. Miguel, Andressa Silva","doi":"10.28927/sr.2022.077321","DOIUrl":"https://doi.org/10.28927/sr.2022.077321","url":null,"abstract":"Soil mechanical fully understanding requires considering a three dimensional approach, including soil response under the second principal stress and its potential anisotropy. In order to achieve such soil mechanical understanding, a true triaxial apparatus might be used. Therefore, in the present research an automated true triaxial apparatus was developed comprising its cubical cell, data acquisition and stress control systems. The manufactured apparatus was validated by means a laboratory test campaign where true triaxial test responses were compared to standard drained triaxial tests. True triaxial and standard drained triaxial tests were carried out on both naturally and artificially cemented soils. Results were gathered and compared. A soil mechanical compatibility was observed when test results of the newest true triaxial equipment were compared to test results obtained from a well validated standard triaxial apparatus. Thereby, the present paper reports an affordable successful true triaxial apparatus development demonstrating its efficiency for regular soil mechanical tests. Finally, a full stress rosette was established for a uniform fine sand where some small anisotropy was detected.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47931862","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

The mechanics of iron tailings from laboratory tests on reconstituted samples collected in post-mortem Dam I in Brumadinho Brumadinho死后大坝I中采集的重建样本的实验室测试中的铁尾矿力学

IF 0.5

Soils and Rocks Pub Date : 2022-04-19 DOI: 10.28927/sr.2022.001122

A. Viana da Fonseca, D. Cordeiro, F. Molina-Gómez, D. Besenzon, A. Fonseca, C. Ferreira

{"title":"The mechanics of iron tailings from laboratory tests on reconstituted samples collected in post-mortem Dam I in Brumadinho","authors":"A. Viana da Fonseca, D. Cordeiro, F. Molina-Gómez, D. Besenzon, A. Fonseca, C. Ferreira","doi":"10.28927/sr.2022.001122","DOIUrl":"https://doi.org/10.28927/sr.2022.001122","url":null,"abstract":"Dam B1 was approximately 85 m high and 700 m long along the crown when it suddenly failed in 25th of January, after 41 years of operations and deposition of tailings at the Paraopeba mining complex (Côrrego de Feijão), in Minas Gerais, Brazil. More than 250 people died and vast economic, social and environmental damages resulted from the collapse. Given the need to geotechnically characterise the tailings within the dam for a credible computational model of the failure, an extensive sampling and laboratory testing campaign took place. The geotechnical laboratory of the Civil Engineering Department at the Faculty of Engineering of the University of Porto (Portugal) was invited by CIMNE, under a contract with VALE, with MPF agreement, to conduct this program. This paper will present a description of the sampling campaigns in the remaining post-mortem dam/reservoir tailings were the failure instability mechanics developed and the experimental program undertaken to test the tailings in advanced laboratory tests. The results that embrace evaluations of the physical, hydraulic and mechanical properties, deduced from integral samples selectively collected and prepared as described, which allowed to define the geotechnical parameters necessary for the referred analyses are here resumed.","PeriodicalId":43687,"journal":{"name":"Soils and Rocks","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45351263","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