Marcos Massao Futai

Marcos Massao Futai
University of São Paulo | USP · Department of Estrutural and Geotechnical Engineering

phD

About

111
Publications
40,353
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712
Citations
Citations since 2017
66 Research Items
581 Citations
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
Additional affiliations
October 2004 - July 2015
University of São Paulo
Position
  • Professor (Associate)

Publications

Publications (111)
Article
Full-text available
Bridges and tunnels are large and complex structures that demand periodic inspections to assess their physical conditions. Although both have different designs and constructions from each other, a common problem they share is the drawbacks that their conventional inspections face. Moreover, conventional procedures not only are laborious, time-consu...
Conference Paper
Full-text available
ABSTRACT: On the geological time scale, it is certain that mass movements will occur on natural slopes, also called landslides. It is estimated that these mass movements are responsible for 5.2% of natural disasters worldwide. As an alternative to mitigating the damage caused by these events, measures for monitoring or prediction can be used on sev...
Article
Full-text available
In this paper, the Pull-Off Test (POT) was analyzed as a method for determining the mode I fracture toughness (KIc) of rock and concrete. POT is submitted to tensile load (which causes a simpler stress state than tests submitted to bending and compression load) and its execution is easy, replicable and can be performed in laboratory and in situ (be...
Conference Paper
Full-text available
Este artigo apresenta uma avaliação da capacidade de carga de fundação de ponte ferroviária considerando o processo de fadiga do maciço rochoso. O estudo foi realizado através de modelagem numérica e revisão bibliográfica, onde um método simples foi utilizado para a consideração da fadiga da rocha de fundação em função dos ciclos de carga (passagem...
Article
Full-text available
Abstract The corrosion of steel rebars is the main cause of reinforced concrete degradation, which results in increasing costs with structural rehabilitation and repairs. As a solution, corrosion resistant rebars, such as those of FRP – Fiber-reinforced polymer –, have been used to replace conventional steel. This paper describes the development of...
Article
Analytical reduced-order models (ROMs) are derived aiming at determining the natural frequencies of offshore wind turbines (OWTs). Case studies based on six wind turbines are developed considering two boundary conditions, namely fixed base (perfectly clamped) and elastic base, representing soil-structure interaction (SSI). For the elastic-base boun...
Article
Full-text available
Numerical modelling development for capillary barrier investigation considering unsaturated soil-geotextile interface has been studied and evaluated in recent years. Most engineering constructions involving geomaterials and geotextiles application, such as reinforced walls, slopes, embankments, and roads, require understanding the hydraulic perform...
Article
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The volumetric discontinuity intensity (\(P_{32}\)) is defined as the total discontinuity area by rock mass volume. \(P_{32}\) has been considered the most suitable parameter to quantify discontinuities within rock masses because it takes into account density and size and does not depend on orientation. Currently, determining the \(P_{32}\) from di...
Article
The present work investigated the relationship between strength variability and the microstructure of granite aggregates. The strength of particles was determined by an improved point load test. The microstructure and composition were evaluated by tactile-visual analysis, water absorption, X-ray diffraction, and petrographic analysis with the calcu...
Article
Geosynthetic-reinforced soil (GRS) walls using marginal soils can operate under unsaturated conditions depending on climate conditions and drainage inside the reinforced zone. Geocomposite reinforcements have been suggested to act as internal drainage layers, but their hydraulic behavior can also be strongly affected by climate conditions. Numerica...
Article
Bridges constitute an important part of the infrastructure and are subjected to damage and deterioration of materials and support conditions, as well as exposure to adverse environmental conditions. Continuous or repeated monitoring of structural responses may add important information for decision making regarding their maintenance, repair and rei...
Article
Full-text available
In this study, we present a numerical investigation of the direct coupling between the deterministic GeoStudio package (Seepage/W and Slope/W software) and the StRAnD reliability package for normal operating conditions of an existing old earth dam over time. Direct coupling avoids errors associated to point estimate methods and to using response su...
Article
Full-text available
Performance and safety of geotechnical structures are affected by uncertainties. Yet, the design of dams is nowadays still made using deterministic methods and design codes. Dam optimization in a deterministic setting may lead to compromised safety margins. In this setting, Reliability-Based Design Optimization (RBDO) appears as an alternative, all...
Article
Full-text available
Onshore wind turbine foundations are subjected to large overturning moments. The wind action imposes cyclic and dynamic loading conditions which occur in extreme and service scenarios. Deep foundations, when used, transfer this large overturning moment through a pile group which combines the axial and lateral resistance of all piles. The paper expl...
Article
Full-text available
The subgrade of a freight railroad track must have sufficient bearing capacity to prevent excessive plastic strains and geometry-related problems to ensure its good performance. The track sub-ballast layer is used to distribute the loads from the ballast to the subgrade, as well as to mitigate climate-based subgrade problems. This study aims to eva...
Article
The number of great magnitude tailings dam collapses has made society increasingly aware of the need to better understand the risk associated with tailings dams’ collapse. Also, the analysis and studies of prior disasters should define the risk profiles and lead to the adoption of more adequate and successful policies and measures to reduce hazards...
Chapter
New communication and information systems and technologies (ICT - Information and Communication Technologies) have great potential to aggregate new functionalities and services to inspect, monitor, and manage bridges and other infrastructure assets. Digital Transformation can reduce maintenance costs (avoiding unnecessary maintenance events) and im...
Article
This article proposes a modification in the direct shear test (DST) to improve the boundary conditions of the test to avoid the undesirable tensile fractures and to promote a single horizontal shear fracture. The modified direct shear test (MDST) basically consists of adding two inclined notches in the test specimen of the DST. An ideal geometry wa...
Article
This article analyzes the MDST as a method for determining KIIc, in function of the confining pressure, of homogeneous rock and concrete and proposes a simple way for KIIc envelope determination. The study was carried out by numerical analysis and the main conclusions are as follows: i) MDST is suitable for KIIc determination, since mode II prevail...
Article
Surface roughness of coarse aggregates, regardless of its known influence in the bonding strength with the cement paste in the hardened state and in the viscosity of the composite in the fresh state, it still a barely researched and discussed topic. In addition, little is known about what rock characteristics influences the multiscale roughness of...
Article
Full-text available
Several studies have addressed the elaboration of petrographic indices, applicability, and their execution in the characterization of weathering grades. Petrographic indices directly depend on a visual criterion used to distinguish fresh mineral from weathered mineral, which is usually not shown. As investigated, this causes a lack of coherence amo...
Article
A laboratory testing that simulates the mechanisms of a geosynthetic-reinforced layer was used to assess the impact of rainwater infiltration on reinforcement loads and strains in mechanically stabilized earth (MSE) walls. The testing device allows measuring loads transferred from a backfill soil subjected simultaneously to surcharge loading and co...
Article
Full-text available
The Monte Seco tunnel (MST) is one of several old unlined tunnels constructed for Brazilian railways in the 1950s, and the MST still receives intense train trafc (primarily for iron ore transportation). The MST was constructed in a fractured gneissic rock mass, which has potential instability problems associated with gravity-driven block falls (at...
Chapter
This paper shows how accurately and efficiently reliability analyses of geotechnical installations can be performed by directly coupling geotechnical software with a reliability solver. An earth slope is used as the study object. The limit equilibrium method of Morgenstern-Price is used to calculate factors of safety and find the critical slip surf...
Article
Full-text available
Monopiles and gravity base foundations (GBF) are two of the most commonly used foundations for offshore wind turbines. As resonance can cause damage and even failure of wind turbines, understanding the difference between the dynamic responses of monopiles and GBFs under free vibration is important. However there is little experimental data regardin...
Conference Paper
Full-text available
In this study, hypothetical sections of tunnels were defined from geological models and classified by the RMR2014 system. The estimation of the alterability parameter obtained by the slake durability test, recently incorporated in this classification, and its influence on the rock mass classification was investigated. The parameters, such as fractu...
Article
Full-text available
This paper presents laboratory and in situ studies carried out on a 200 000 m 3 large clayey silt compacted embankment. Laboratory studies carried out on undeformed block samples included index tests, strength tests and water retention curves using the filter paper technique. Grain size analyses with and without a deflocculating agent clearly showe...
Article
The pull-off test (POT) is a tensile strength testing method that is widely used in concrete/mortar and was recently applied to rock mechanics. The POT can be easily performed in both the field and the laboratory. This study uses the extended finite-element method to analyze the POT fracture mechanism under different test conditions and to assess t...
Article
Geotechnical analysis of tunnels in complex geo-structural environments requires an advanced understanding of the inter-block structure effect on rock mass behavior, such as joints and fractures systems, bedding and foliation planes, among other discontinuity types. The conventional approach for preliminary geotechnical analysis of tunnels is based...
Article
Full-text available
Numerical methods are helpful for understanding the behaviors of geotechnical installations. However, the computational cost sometimes may become prohibitive when structural reliability analysis is performed, due to repetitive calls to the deterministic solver. In this paper, we show how accurate and efficient reliability analyses of geotechnical i...
Article
This paper combines seepage analysis with limit equilibrium analysis to investigate the safety of an earth dam over time and during drawdown. The numerical investigation is accomplished by directly coupling the de-terministic software packages Seepage/W and Slope/W with the StRAnD reliability software. The first-order reliability method is employed...
Article
This paper presents a numerical method for considering soil-atmosphere interaction applied to infiltration into an unsaturated geosynthetic reinforced soil wall and its effect on wall stability. A hypothetical nonwoven geotextile reinforced soil wall was subjected to simulated conditions of evaporation and precipitation over 2 years considering loc...
Conference Paper
This paper presents an approach coupling terrestrial laser scanning (TLS) and dis-crete fracture networks (DFN) for tunnel modeling in fractured rock masses. The approach is composed by discontinuity mapping via TLS point clouds, automatic discontinuity analysis via VBA-Excel routines and automatic DFN modeling via FISH-3DEC routines. The volumetri...
Article
This article presents a study on durability index obtained in the slake durability test (SDT) and the uniaxial compressive strength (UCS) of a gneissic rock from the Nova Venécia Complex, southeastern Brazil. The gneissic rock mass, excavated for a railway tunnel without a lining, has presented problems of instability of blocks due to a long-term e...
Article
Sand–concrete interface direct shear tests were used to investigate the effects of surface roughness, surface waviness, mean sand diameter and relative density on interface strength and behavior under different confinement conditions. Extreme concrete surface textures, including smooth, rough and rough–wavy textures, were reproduced. Surface plowin...
Conference Paper
Full-text available
In this work a 3D digital model generated with SfM-MVS is used to investigate rock slope stability. The test site is a deactivated quarry used as recreational area for climbers. The model was divided in three sectors. Sector 1 has the least steep slope and structures are parallel to slope face. Sectors 2 and 3 have steeper slope angles and are pron...
Conference Paper
Full-text available
This paper compiles and compares data from literature of the shear strength of rock-concrete interface via direct shear test under constant normal load in the laboratory. In this paper are presented: materials used in some studies; typical values of shear strength of rock-concrete interface; parametric studies (scale effect, bond percentage effect,...
Conference Paper
In this research, a 40-m-long shallow railway rock tunnel known as “Monte Seco tunnel” located at Vitória-Minas Railway in Brazil is studied. It has been scanned by a 3D Terrestrial Laser Scanning (TLS) instrumentation and its geometry was reconstructed as a point cloud. The obtained shape lacked geometrical details in some regions due to geometry...
Article
In this study, a 40 m-long section of a shallow railway rock tunnel so-called "Monte Seco tunnel" located at Vitoria Minas Railway in Brazil is investigated. In the real environment, the tunnel has been scanned by a 3D Terrestrial Laser Scanning (TLS) instrumentation and its geometry was reconstructed on a point cloud. Due to the complex geometry o...
Article
Full-text available
The conventional design of concrete gravity dams still follows the deterministic method, which does not directly quantify the effect of uncertainties on the safety of the structure. The theory of structural reliability allows the quantification of safety of these structures, from the quantification of the inherent uncertainties in resistance and lo...
Article
Full-text available
In this paper, the Classic Lattice Spring Model is developed in order to be applied to probabilistic stability analyses of rock tunnels in low in situ stress environments, where the falling of blocks is the main failure mechanism. For this objective, the method is combined with the Synthetic Rock Mass technique and Barton- Bandis joint constitutive...
Conference Paper
A interface solo-estrutura possui uma grande relevância no desempenho de obras geotécnicas. Neste estudo, foram realizarados ensaios de cisalhamento direto em interface areia-concreto e uma análise dos dados disponíveis na literatura a fim de avaliar a razão entre o ângulo de atrito da interface areia-concreto δ em relação ao da própria areia φ. Os...
Conference Paper
A interface solo-sólido possui grande relevância no comportamento de estruturas, como fundações e contenções. Quando o solo em contato com a estrutura está no estado não saturado, a resistência desta interface é alterada. Desta forma, realizou-se uma análise analítica do empuxo atuante e da resistência ao deslizamento de uma contenção hipotética a...
Article
Laboratory and field investigation of time-dependent behavior of geotextiles reinforcing a fine-grained soil are evaluated herein. The field assessment consisted of analyses of two instrumented sections of a geotextile reinforced soil wall with identical layouts, including one section with a woven and another with a nonwoven geotextile. In addition...
Article
Geotechnical analysis of tunnels in complex geostructural environments requires an advanced understanding of the inter-block structure effect on rock mass behaviour, such as joints and fractures systems, bedding and foliation planes, among other discontinuity types. The conventional approach for preliminary geotechnical analysis of tunnels is based...
Article
Full-text available
Discontinuity mapping and analysis are extremely important for modeling shallow tunnels constructed in fractured rock masses. However, the limited exposure and variability of rock face orientation in tunnels must be taken into account. In this paper, an automatic method is proposed to generate discrete fracture networks (DFNs) using terrestrial las...
Conference Paper
Full-text available
Diferentes métodos de modelagem numérica têm sido desenvolvidos para simular a interação maciço-suporte em obra subterrânea e a céu aberto. O objetivo deste estudo é fazer uma breve comparação de três métodos destinados a poços de grande diâmetro, através do programa Abaqus 6.12, a fim de se verificar a influência do modo de ativação do suporte e d...
Conference Paper
Despite of the geocell application in several areas of geotechnical engineering, such as a retaining wall, slope protection against erosion and channel lining, this geosynthetic was initially designed to improve soil bearing capacity to allow heavy vehicles traffic on the desert sand for the Golf War. As reinforcement, geocell satisfactorily increa...
Conference Paper
This paper presents an example of 3DEC modelling of a rock tunnel using geological mapping obtained from 3D images of terrestrial laser scanner and the discrete fracture network approach. Three main discontinuity sets were identified in an 8-m-long section of a tunnel constructed in gneiss. The amount of discontinuity data obtained by 3D Terrestria...
Conference Paper
Full-text available
Certain tunnels of Vitória-Mina Railway have presented rock fall problems which do not represent major risks, but can impair the railway operation. The TUNELCON Project, partnership between Vale SA and Escola Politécnica da Universidade de São Paulo (EPUSP), seeks to study the geomechanical behavior of these tunnels trough laboratory tests, geologi...
Article
This study addressed the analysis of geocells as basal reinforcement for embankments on soft soils. The equation proposed for this application is based on a previously developed method for predicting the bearing capacity of geocell-reinforced soils, which considers the characteristics of the founding strata, geocell in-fill soil, geometry of the ge...
Article
This study addressed the analysis of geocells as basal reinforcement for embankments on soft soils. The equation proposed for this application is based on a previously developed method for predicting the bearing capacity of geocell-reinforced soils, which considers the characteristics of the founding strata, geocell in-fill soil, geometry of the ge...
Conference Paper
Full-text available
RESUMO: Os muros em solo reforçado construídos no Brasil nos quais foram utilizados solos finos de baixa capacidade de drenagem têm apresentado excelentes comportamentos a longo prazo, principalmente quando utilizaram-se solos lateríticos. O sucesso dessas estruturas é normalmente atribuído a manutenção da condição não saturada do solo e, consequen...
Article
This paper attempts to evaluate various methods of geometrical discontinuity characterization using point clouds that are generated with three-dimensional terrestrial laser scanning (3DTLS) in a tunnel. The use of 3DTLS to support discontinuity mapping in tunnels enables the acquisition of a large amount of data without limitations in terms of the...
Article
When soils are inundated with liquids other than water, a physicochemical interaction takes place and can alter the soil behavior. Depending on the type of soil and on the solution, the soil can become more compressible and lose strength (or the contrary). In this paper, tropical residual gneiss soils are used, namely lateritic and saprolitic soils...
Article
The subsoil of Recife Lowland was formed by several geodynamic events, the most important being the successive transgressions and regressions of the sea level, contributing to the creation of an aggressive environment. The degradation of building foundations by physical and chemical agents has caused problems in buildings constructed with non-struc...