Soils and Rocks最新文献_第3页

Alert scenarios for the Metropolitan Region of Recife-PE based on monitoring of rainfall and soil humidity – a case study 基于降雨量和土壤湿度监测的累西腓大都市区预警方案--案例研究

Soils and Rocks Pub Date : 2023-11-23 DOI: 10.28927/sr.2023.008323

Roberto Coutinho, Bruno Morais, Rodolfo Mendes, Marcio Andrade

{"title":"Alert scenarios for the Metropolitan Region of Recife-PE based on monitoring of rainfall and soil humidity – a case study","authors":"Roberto Coutinho, Bruno Morais, Rodolfo Mendes, Marcio Andrade","doi":"10.28927/sr.2023.008323","DOIUrl":"https://doi.org/10.28927/sr.2023.008323","url":null,"abstract":"In Brazil, landslides are frequent, causing deaths and property damage, and occur under the influence of natural and/or anthropic conditions. Rain acts as the main non-anthropic agent in triggering this phenomenon. Because of this, the prediction of landslides becomes an essential tool for managing high-risk areas. The Metropolitan Region of Recife (MRR) has a large history with numerous cases of mass movements over the years. Currently, research points out improvements in the quality of forecasts by including hydrological information, such as soil moisture, in warning systems. Given the importance of measuring soil moisture in situ, a network of equipment consisting of rain gauges and capacitive moisture sensors was installed in the MRR, to monitor rainfall and soil moisture in an integrated manner. The objective of this article is to understand the hydrological conditions of the soil in two high-risk areas of the MRR, built over the Barreiras Formation to set the foundations for the development of a Landslide Early Warning System (LEWS) that integrates rain and humidity. The data showed that the variation in soil moisture is very dependent on rainfall and presents sudden variations in moisture with increasing hourly rainfall. The data also revealed that the monitored soils remained wet for approximately six months in the year 2022, highlighting the potential for moderate rainfall during this period to trigger landslides.","PeriodicalId":507352,"journal":{"name":"Soils and Rocks","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139243964","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

Application of digital technologies in landslide prediction, mapping, and monitoring 数字技术在滑坡预测、绘图和监测中的应用

Soils and Rocks Pub Date : 2023-11-23 DOI: 10.28927/sr.2023.005823

Gabriel Araújo, Alessandra Corsi, Eduardo Macedo, M. Futai

引用次数: 0

Mechanically stabilized wall (MSW) with geogrids as complement of partially executed anchored wall 使用土工格栅的机械加固墙 (MSW) 作为部分锚固墙的补充

Soils and Rocks Pub Date : 2023-11-22 DOI: 10.28927/sr.2023.004623

Cristina Schmidt, Pedro Anjos, Ivan Steinmeyer, Mateus Cleto, Emília Andrade

引用次数: 0

Influence of the degree of saturation and the wetting front on the stability of cliffs: a case study on a cliff located on the beach of Tabatinga-RN-Brazil 饱和度和湿润前沿对悬崖稳定性的影响：对巴西塔巴廷加海滩悬崖的案例研究

Soils and Rocks Pub Date : 2023-11-22 DOI: 10.28927/sr.2023.005423

Allan Medeiros, Romário Silva, Valteson Santos, Olavo Santos Júnior, Ricardo Severo, Osvaldo de Freitas Neto, Bruna Lira

{"title":"Influence of the degree of saturation and the wetting front on the stability of cliffs: a case study on a cliff located on the beach of Tabatinga-RN-Brazil","authors":"Allan Medeiros, Romário Silva, Valteson Santos, Olavo Santos Júnior, Ricardo Severo, Osvaldo de Freitas Neto, Bruna Lira","doi":"10.28927/sr.2023.005423","DOIUrl":"https://doi.org/10.28927/sr.2023.005423","url":null,"abstract":"Coastal zones are of great interest in civil engineering due to their economic relevance and active geological dynamics. In Brazil, the development of these regions is related to the use of their geomorphological features in the landscape, among which the cliffs stand out. Although there are studies that consider the influence of the wetting front in stability analysis with cliffs, in general, the studies only consider extreme saturation situations (dry and saturated). In this sense, the present study aims to understand the influence of the wetting front and the degree of saturation reached by the materials in the stability of cliffs composed of Barreiras Formation soil. The stability analyses were carried out using the limit equilibrium method and stress analysis, varying the degrees of saturation of the materials and wetting fronts of a model of a cliff located at Praia de Tabatinga, State of Rio Grande do Norte, Brazil. Failures were identified, in different wetting fronts, by the limit equilibrium method from degrees of saturation around 20%, and by the stress analysis method around 40%. Thus, it was concluded that the variation in the degree of saturation has a preponderant effect on the destabilization of a cliff, since partial saturations are already enough to trigger significant mass movements. It was also noticeable that the wetting front is a relevant effect on instability, although conditioned to the degree of saturation reached, which may enhance the order of magnitude of the identified failures.","PeriodicalId":507352,"journal":{"name":"Soils and Rocks","volume":"408 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139249862","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 site characterization by DMT and laboratory tests on an unsaturated tropical soil site for slope stability analysis 通过 DMT 和实验室测试对非饱和热带土壤进行岩土工程场地特征描述，以分析斜坡稳定性

Soils and Rocks Pub Date : 2023-11-22 DOI: 10.28927/sr.2023.005123

Breno Rocha, Jhaber Yacoub, Jeferson Fernandes, Roger Rodrigues, H. Giacheti

{"title":"Geotechnical site characterization by DMT and laboratory tests on an unsaturated tropical soil site for slope stability analysis","authors":"Breno Rocha, Jhaber Yacoub, Jeferson Fernandes, Roger Rodrigues, H. Giacheti","doi":"10.28927/sr.2023.005123","DOIUrl":"https://doi.org/10.28927/sr.2023.005123","url":null,"abstract":"The slope stability is an important topic because it presents risks of socio-economic losses caused by eventual ruptures. It is necessary to identify the site profile, as well as obtaining soil strength parameters for the slope stability analysis. This paper presents and discusses the use of the Flat Dilatometer Test (DMT) in the geotechnical site characterization for slope stability analysis in an unsaturated tropical soil site. Six DMTs were performed to define the stratigraphical profile and estimate geotechnical parameters. Shear strength parameters were determined in the laboratory using saturated and unsaturated triaxial compression as well as soil water retention curves (SWRC) to support DMT data interpretation. A commercial software was used to perform the slope stability analysis a cut slope with 6.6 m height and a gradient around 55° to illustrate the application of DMT and triaxial test data. The DMT allowed the representative site profile to be identified, as well as estimating the design parameters that compared well to those interpreted from unsaturated triaxial test data for the in-situ soil suction. The DMT can be used as logging test in the preliminary characterization of studied site specially to define the stratigraphical profile, site variability, select the regions to collect disturbed and undisturbed soil samples and as the first attempt to estimate the geotechnical design parameters via correlations. It is important to emphasize that laboratory tests on undisturbed soil samples are essential in the slope stability analysis of unsaturated tropical soil profiles.","PeriodicalId":507352,"journal":{"name":"Soils and Rocks","volume":"349 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139248584","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

Back-analyses of soft soil failure with "strain-softening" behavior by the "equivalent sensitivity" concept 利用 "等效灵敏度 "概念对具有 "应变软化 "行为的软土破坏进行反向分析

Soils and Rocks Pub Date : 2023-11-22 DOI: 10.28927/sr.2023.005323

Lennon Silva, Marcus Pacheco

引用次数: 0

Hydro-mechanical numerical analysis of fault reactivation due petroleum production as trigger for submarine slope stability 对石油生产引起的断层再激活作为海底斜坡稳定性触发因素的水力机械数值分析

Soils and Rocks Pub Date : 2023-11-22 DOI: 10.28927/sr.2023.006523

Tasso Silva, Igor Gomes, Tiago Miranda, Julliana Fernandes, José Barbosa, Leonardo Guimarães

{"title":"Hydro-mechanical numerical analysis of fault reactivation due petroleum production as trigger for submarine slope stability","authors":"Tasso Silva, Igor Gomes, Tiago Miranda, Julliana Fernandes, José Barbosa, Leonardo Guimarães","doi":"10.28927/sr.2023.006523","DOIUrl":"https://doi.org/10.28927/sr.2023.006523","url":null,"abstract":"Oil production in offshore regions involves the transportation of oil and gas in submarine pipelines, which are vulnerable to geological processes triggered by subsurface oil production like fault reactivation. The fault reactivation process can lead to phenomena that impact the seabed, like subsidence and fluid exudation, and can trigger instability of submarine slopes, which can result in environmental and economic damage. The present work addresses a coupled hydromechanical numerical modeling of a hypothetical case involving fault reactivation caused by oil reservoir production and its impact on an overlying submarine slope. The hypothetical case was simulated using a finite element model. The case involves a reservoir which is cut by a fault zone that reaches the seabed. The slope instability studied was induced by the injection and production of fluids in the reservoir. The fault zone is assumed to be a sealing region and a geomechanical and pressure field discontinuity within the reservoir. Int this work was used the Mohr-Coulomb elastoplastic model with Perzyna viscoplastic regularization to represent the behavior of the fault zone and the overlying submarine slope. Results showed that the fault reactivation, caused by the reservoir production, developed shear stress and shear plastic strain along the fault and through the submarine slope, causing horizontal and vertical displacements in the slope mass and acting as a trigger factor for slope stability. Pore pressure increase at the bottom of the slope structure correlated with the injection pressure artificially increased into the reservoir.","PeriodicalId":507352,"journal":{"name":"Soils and Rocks","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139247759","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

Shear strength reduction factor used in critical state models with hardening 硬化临界状态模型中使用的剪切强度降低系数

Soils and Rocks Pub Date : 2023-11-22 DOI: 10.28927/sr.2023.004123

Isabella Souza, Daniela Rojas, Ana Pires, M. Farias, M. C. Cordão Neto

引用次数: 0

3D numerical analysis of soil nailing in sedimentary soil with vertical inclusions 带有垂直包裹体的沉积土中土钉的三维数值分析

Soils and Rocks Pub Date : 2023-11-22 DOI: 10.28927/sr.2023.005723

M. Barbosa, Leonardo Ferreira, George Souza, R. Cunha, E. Palmeira

{"title":"3D numerical analysis of soil nailing in sedimentary soil with vertical inclusions","authors":"M. Barbosa, Leonardo Ferreira, George Souza, R. Cunha, E. Palmeira","doi":"10.28927/sr.2023.005723","DOIUrl":"https://doi.org/10.28927/sr.2023.005723","url":null,"abstract":"In this case study of a soil nail retaining wall, the measured horizontal displacement is of the order of 0.023% H, where H is the excavation depth, while the two-dimensional Finite Element Method (FEM) analysis suggests horizontal displacements of the order of at least 0.5% H. This study aims to understand which parameters influence such displacements through a Sensitivity Analysis. In addition, the study compares results obtained through two-dimensional and three-dimensional FEM analyses for this case. It concludes that Young’s Modulus (E) and the in-situ earth pressure coefficient (K0) are the two parameters that most influence such displacements. This study shows that Mohr Coulomb’s perfectly plastic Elastic Constitutive Model is unsuitable for simulating this structure, which had minimal displacements in situ, suggesting the Hardening Soil model (Schanz et al., 1999) as a viable alternative. Compared to 3D analysis, 2D analysis showed significantly larger horizontal displacements. This led to the conclusion that 2D analysis in MEF is unsuitable for predicting lateral displacements unless a Reduction Factor (FR) ranging from 0.4 to 1.0 was applied.","PeriodicalId":507352,"journal":{"name":"Soils and Rocks","volume":"224 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139248234","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 analysis of the breakwater failure at the Sergipe Terminal Port 对塞尔希培码头港防波堤失效进行数值分析

Soils and Rocks Pub Date : 2023-11-21 DOI: 10.28927/sr.2023.005223

Pedro Roque, C. Romanel, Celso Villalobos, J. Huertas

{"title":"Numerical analysis of the breakwater failure at the Sergipe Terminal Port","authors":"Pedro Roque, C. Romanel, Celso Villalobos, J. Huertas","doi":"10.28927/sr.2023.005223","DOIUrl":"https://doi.org/10.28927/sr.2023.005223","url":null,"abstract":"The breakwater failure at the Sergipe Harbor is a well-known event among the Brazilian geotechnical community, which provided great knowledge about the behavior of embankments on soft soils, although some questions still remain, since the back analysis diverged from the field outcome. In this context, this work aims to carry out a numerical analysis of the construction of the breakwater using the finite element method to understand the mechanisms of failure. A fully coupled flow-deformation analysis was performed in Plaxis 2D software, using the Soft Soil Creep and Mohr-Coulomb constitutive soil models. The Volume Method was also applied to estimate the stability of the slopes, from the calculated numerical displacements. The interpretation of the results allowed to verify that the analysis simulated behaviors that had been raised as responsible for the failure. High excess pore pressure levels were generated in the phase at which failure occurred, in addition to a strain softening behavior, which, alongside the progressive failure, could justify why the back analysis considering unrealistic gains in undrained strength, calculated by the increase of the vertical effective stresses, had provided missed factors of safety. Although shear deformations and horizontal displacements were verified for both sides of the breakwater, the “shared failure” assumption could not be verified, since the shear stress was mobilized in the rockfill.","PeriodicalId":507352,"journal":{"name":"Soils and Rocks","volume":"24 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139253969","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