Tomas Manuel Fernandez-Steeger

Tomas Manuel Fernandez-Steeger
Technische Universität Berlin | TUB · Chair of Engineering Geology

Prof. Dr.

About

154
Publications
49,856
Reads
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1,204
Citations
Citations since 2017
28 Research Items
685 Citations
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
Additional affiliations
May 2016 - present
Technische Universität Berlin
Position
  • Professor
December 2004 - May 2016
RWTH Aachen University
Position
  • Akademischer Oberrat
October 1998 - March 2002
Karlsruhe Institute of Technology
Position
  • PhD Student

Publications

Publications (154)
Article
Full-text available
The blast- and earth-fill dam of the Kambarata 2 hydropower station is situated in the seismically active Central Tien Shan region of the Kyrgyz Republic. More than 70% of the dam volume was produced during a blast event on December 22, 2009. In 2010–2011, dam construction was completed after earth filling on top of the blasted material and install...
Article
Full-text available
Heavy rainfall on February 20, 2010, triggered numerous shallow rapid landslides across Madeira Island, a Portuguese archipelago in the North Atlantic. Two days after the extreme rainfall event, a field campaign was started which involved describing and mapping a variety of landslide types and the related losses at 120 different locations throughou...
Article
Full-text available
During mechanical tunnel driving, the excavated material often leads to several problems. For example, the sticking of clay in a tunnel boring machine can occur at various surfaces: at the cutting wheel, in the mixing chamber, and in the transport system. Unfortunately, it is presently very difficult to quantify the adhesion by using laboratory tes...
Article
Full-text available
Lake Ohrid Basin is a graben structure situated in the Dinarides at the border of the Former Yugoslavian Republic of Macedonia (FYROM) and Albania. It hosts one of the oldest lakes in Europe and is characterized by a basin and range-like geological setting together with the half-graben basins of Korca, Erseka and Debar. The basin is surrounded by P...
Article
Full-text available
Wireless Sensor Networks (WSNs) are versatile monitoring systems that can provide a large amount of real-time data in scenarios where wired infrastructures are inapplicable or expensive. This technology is expected to be handled by domain experts, who perceive a WSN as a (promised to be) easy to deploy black box. This work presents the deployment e...
Conference Paper
Full-text available
In diesem Beitrag werden verschiedene Betriebsszenarien für einen Bodenabsorber zur Gebäudeheizung- und Kühlung anhand eines validierten Simulationsmodelles untersucht und hinsichtlich ihrer Auswirkung auf den Boden analysiert. Es zeigt sich, dass ein bilanzierter Heiz- und Kühlbetrieb des Bodenabsorber, aufgrund des erheblichen Wärmeeintrags, durc...
Article
Full-text available
Zusammenfassung Für die Planung und Auslegung von Bauwerken in Erdbebengebieten mit hohen Grundwasserständen ist das Verflüssigungspotenzial des Baugrunds zu untersuchen und zu bewerten. In DIN EN 1998-5:2010-12 (2010) sind die auf SPT-Schlagzahlen basierenden Diagramme für die Beurteilung der Verflüssigungsgefährdung angegeben. Im vorliegenden Bei...
Article
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Rocks are natural materials with a heterogeneous microstructure, and the heterogeneity of the microstructure plays a crucial role in the evolution of microcracks during the compression process. A numerical model of a rock with a heterogeneous structure under compression is developed by digital image processing techniques and the discrete element me...
Article
Commonly, the base stability of sheeted excavation pits against seepage failure by heave is evaluated by using Terzaghi’s failure plane, which is based on the results of the two-dimensional model tests. However, seepage flows in excavation pits are three-dimensional, and stress levels are relatively high compared to those existing in the model test...
Conference Paper
Full-text available
volution de l'occupation du sol et extraction des zones habitées à partir des images satellite Landsat : étude de cas du flanc ouest du mont Oku (Ligne volcanique du Cameroun) WDL Djukem (1*) • ASL Wouatong (1) • A Braun (2) • TM Fernandez-Steeger (2) • and H-B Havenith (4) ABSTRACT Deforestation, intensive agriculture and overgrazing, combined wit...
Article
Full-text available
For thermal and loaded rock in engineering structures for some projects, triple-shear Drucker–Prager yield criteria, compaction coefficient K, damage variable correction factor δ, and thermal damage variable DT are introduced in a new thermomechanical (TM) constitutive model for the entire process. The compaction stage of rock in uniaxial compressi...
Article
Full-text available
In the study of rock mechanics, the variation of rock mechanical characteristics in high-temperature environments is always a major issue. The discrete element method and Voronoi modeling method were used to study the mechanical characteristics and crack evolution of granite specimens subjected to the high temperature and uniaxial compression test...
Article
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Aiming at the acid-etched freeze-thaw rock for geotechnical engineering in cold regions, chemical damage variables, freeze-thaw damage variables, and force damage variables were introduced to define the degree of degradation of rock materials, the law of damage evolution, the total damage variable of acid-corroded rock under the coupling action of...
Article
Full-text available
This study compared the effects of the sulfate dry-wet cycle on the properties of ordinary concrete and nano-TiO2-modified concrete, including the mass loss rate, ultrasonic wave velocity, compressive strength, and XRD characteristics. In addition, a series of compression simulations carried out using the PFC2D software are also presented for compa...
Article
The typical climatic and environmental conditions in Central Asia are major natural factors causing local rock masses to face considerable risks of damage due to constant freeze-thaw cycles. In addition, these are exacerbated by the dense acidic environments in certain industrialized areas, such as Northern Sinkiang, China. To provide local enginee...
Article
Full-text available
Zusammenfassung Im Vergleich zum homogenen Fall kann die Existenz einer Bodenschichtung die Ausbildung des hydraulischen Grundbruchs in Baugruben günstig oder ungünstig beeinflussen. Der Einfluss der Bodenschichtung auf den entstehenden Potenzialabbau kann mittels FE-Analysen einfach ermittelt werden. In der Fachliteratur existieren jedoch relativ...
Article
Full-text available
High temperatures can enhance the chloride diffusion coefficient and this poses a threat to reinforced concrete (RC) piles. This study intends to propose predictive models that can evaluate the service life and lateral bearing behaviour of reinforced concrete piles subjected to marine environments and varying temperatures. The models show that temp...
Article
Full-text available
After the publication of the type-profiles for the estimation of the joint roughness coefficient (JRC) a discussion evolved about how to adequately use these traces. Based on the chart numerous researchers assembled mathematical correlations with various parameters seeking objectivity in the determination of JRC. Within these works differences conc...
Chapter
Landslide susceptibility maps can be a useful tool to support holistic urban planning in mountainous environments. Data-driven methods for landslide susceptibility modeling work well even in data scarce areas, and there is an increasing relevance of machine learning methods that help analyze efficiently large and complex datasets. In this contribut...
Article
Full-text available
In this work, we explored a novel approach to integrate both geo-environmental and soil geomechanical parameters in a landslide susceptibility model. A total of 179 shallow to deep landslides were identified using Google Earth images and field observations. Moreover, soil geomechanical properties of 11 representative soil samples were analyzed. The...
Conference Paper
This paper discusses the difficulties concerning the use of correlations for the determination of JRC. It focuses on the uncertainties of the input data and their consequences. Fractal and statistical methods were applied.
Conference Paper
Within this study the effects of the sawing process in the production of rock samples for the estimation of the basic friction angle are analysed. To do so, different sawing blades were used. In summary, soft rocks and rocks with finer mineral texture tend to develop sawing grooves, which results in larger variations of the basic friction angle. Ha...
Conference Paper
Für die Scherfestigkeitseigenschaften von Gestein sind zwei Parameter elementar: Die Kohäsion und die Reibung. Zweitere wird durch den Reibungswinkel definiert. In der folgenden Arbeit werden die Auswirkungen unterschiedlicher Sägeblätter bei der Herstellung von Proben zur Bestimmung des Basisreibungswinkels erläutert. Konkret wird die Frage beantw...
Article
The roughness of rock discontinuities is an important input parameter for mechanical models of rock masses. To reliably calculate roughness indices, adequate representations of the surfaces are required. Various optical measuring approaches have been applied in the past. However, many studies lack information on resolution and accuracy of the resul...
Article
Full-text available
Zusammenfassung Die vorliegende Arbeit beschäftigt sich mit dem Einfluss der Korngrößenverteilungen von nichtbindigen homogenen Böden auf den Mechanismus des hydraulischen Grundbruchs. Zu diesem Zweck werden Modellversuche an zwölf unterschiedlichen Böden durchgeführt, deren Korngrößenverteilungen im Bereich zwischen Feinsand und Feinkies liegen. D...
Article
Packed column experiments were conducted to investigate the transport and blocking behavior of surfactant- and polymer-stabilized engineered silver nanoparticles (Ag-ENPs) in saturated natural aquifer media with varying content of material < 0.063 mm in diameter (silt and clay fraction), background solution chemistry, and flow velocity. Breakthroug...
Article
Full-text available
Increasing global energy demand is a central challenge of the 21st century. Apart from renewable energy concepts, sustainable bridging and buffering technologies are needed which simultaneously offer long-term energy supply guarantees. Underground coal gasification (UCG) shows a promising potential to meet these requirements of future energy market...
Conference Paper
Full-text available
Rundungsgrad ist einer von drei maßgebenden Bestandteilen des komplexen Parameters Korngestalt und beeinflusst das mechanische Verhalten der Lockergesteine. Trotz vielfältiger Un-tersuchungen, Klassifizierung sversuche und Beschreibungen ist der Rundungsgrad, welcher sich schwer von den beiden anderen weitgehend unabhängigen Aspekten Kornform (Sphä...
Article
The macroscopic mechanical properties of granite collected from the Fujian Province, China were measured using uniaxial compression and three-point bending after the granite was exposed to high temperatures. The stress-strain relationship was measured and mechanical properties including the Young's modulus, uniaxial compressive strength (UCS) and f...
Article
Full-text available
Zusammenfassung Im vorliegenden Beitrag werden zwei Problemstellungen hinsichtlich des hydraulischen Grundbruchs in Baugruben diskutiert. Zum einen führt der Sicherheitsnachweis gegen hydraulischen Grundbruch nach DIN EN 1997-1 (2014-03) in Abhängigkeit von den herangezogenen Grenzgleichgewichtsbedingungen zu unterschiedlichen Ergebnissen. Es wird...
Article
Full-text available
The fast development of wireless sensor networks and MEMS make it possible to set up today real-time wireless geotechnical monitoring. To handle interferences and noises from the output data, Kalman filter can be selected as a method to achieve a more realistic estimate of the observations. In this paper, a one-day wireless measurement using accele...
Conference Paper
Full-text available
Landslides are the result of a complex interplay of geological, geomorphological, hydrological, climatic and anthropogenic factors, whose relationships have to be clarified in order to understand spatial patterns of landslide susceptibility. Even for regions poor in data a lot can be done to improve this understanding using a simple dataset and sui...
Article
Full-text available
Underground Coal Gasification (UCG) technology is steadily improving due to high scientific and industrial efforts in currently over 14 countries worldwide. A fundamental UCG objective refers to syngas production for multiple end-uses, accompanied by environmental impact mitigation focusing contaminant reduction. In terms of this topic, the control...
Poster
Full-text available
During several years, a series of geophysical surveys have been carried out in East Belgium to study the seismically active Hockai Fault Zone (HFZ). The most prominent earthquake that occurred in that fault zone is the 1692 Verviers Earthquake with a magnitude of M6-6.5; it is also the largest historical seismic event in NW Europe. The geomorphic i...
Poster
During several years, a series of geophysical surveys have been carried out in East Belgium to study the seismically active Hockai Fault Zone (HFZ). The most prominent earthquake that occurred in that fault zone is the 1692 Verviers Earthquake with a magnitude of M6-6.5; it is also the largest historical seismic event in NW Europe. The geomorphic i...
Conference Paper
Full-text available
Today fires are widely accepted to be a natural agent in forest ecosystems. Nevertheless besides direct impacts of fire, secondary postfire effects may have a considerable impact on the welfare and safety of the affected society. Our research is focused on secondary post-fire hazards like landslides, debris flows, flash floods and erosion processes...
Article
Commonly, the base stability of sheeted excavation pits against seepage failure by heave is evaluated by using two-dimensional groundwater flow models and Terzaghi’s failure criterion. The objective of the present study is to investigate the effect of three-dimensional groundwater flow on the heave for sheeted excavation pits with various dimension...
Article
Due to the large complexity, interactions and feedback effects of geo-processes directly influencing our live, there is an increasing need for information and monitoring of our environment. For this tasks wireless sensor networks (WSN) are expected to provide future solutions for observation tasks, which can not be covered by current monitoring sys...
Article
Time dependent deformation is a common process in soil slopes but never the less a challenging task for stability assessment. Slope failure and the land subsidence can adversely influence environment, human safety and economic development. In order to achieve management and mitigation of soil slope failure, it is essential to employ remote sensing...
Article
Full-text available
Multiple factors, such as geology, high mountain topography, seismic activity, climatic conditions and mining activities cause significant landslide hazard in the region around Maily-Say, Kyrgyzstan. To assess the landslide susceptibility a database containing landslide information and geological, morphological and hydrological parameters associate...
Chapter
Full-text available
The process of Underground Coal Gasification (UCG) bears the potential to produce medium to high calorific syngas for several industrial applications, e.g. electricity generation in the frame of the Integrated Gasification Combined Cycle (IGCC) concept; or Coal-To-Liquid (CTL) technologies as the Fischer-Tropsch synthesis. In view of preferred envi...
Article
Accelerometer and inclinometer are inertial sensors capable of measuring corresponding magnitude of Earth gravitational field along the direction of each axis. By means of rotation matrices related to inertial navigation methods, the output values of a three-dimensional accelerometer or a two-dimensional inclinometer can be transformed and processe...
Conference Paper
Full-text available
One of the major causes of landslides is earthquake loading. Conventionally, the evaluation of landslides under seismic load is performed by using pseudo-static and displacement-based methods. However, through recent advances in computational ability, numerical methods have become popular to evaluate the seismic stability of slopes. This study aime...
Conference Paper
Building the lower basin of a pumped-storage hydropower plant in an active limestone quarry without any sealing is a challenging project. A proper site investigation is crucial to increase the overall efficieny of planning as well as realisation by anticipating potential problems and sticking points. The local geology comprises a complex system of...
Article
We studied in a highly fractured Lower Carboniferous carbonate quarry close to Hastenrath (Voreifel, Germany) that provides a good analogue to a fractured carbonate reservoir, two modern techniques to collect data on fracture orientation semi-automatically in the field, and compared them to the results of traditional fracture measurements. Firstly,...
Article
Extensive geological and hydrogeological investigations have been undertaken for the planned pumped-storage hydroelectric power plant in “Blautal” (Swabian Alb, Germany) in order to characterise the Jurassic karst aquifer in which the lower reservoir will be constructed. The preferred option for the plant setup is to integrate the lower reservoir i...
Conference Paper
Full-text available
A landslide susceptibility analysis was carried out for a tectonically active high mountain region in Kyrgyzstan with data mining methods. A landslide inventory and a factor dataset based on a digital elevation model and a geological map were investigated for patterns and dependencies regarding landslide occurrence using classification algorithms....
Article
Full-text available
Palaeostress analysis of an active bedrock normal fault scarp based on kinematic indicators is carried applying terrestrial laser scanning (t-LiDAR or TLS). For this purpose three key elements are necessary for a defined region on the fault plane: (i) the orientation of the fault plane, (ii) the orientation of the slickenside lineation or other kin...
Conference Paper
At present the pumped-storage hydropower plant Blautal is planned with a unsealed lower basin below the groundwater table in a limestone quarry at the southern margin of the Blautal, about 4 Km east of the karst spring Blautopf. The lower basin will be bordered in the east by a steep 95 m high rock face. Due to the high environmental sensibility mi...
Conference Paper
Heavy rainfall on February 20, 2010 triggered numerous shallow rapid landslides across Madeira Island. Most failures started asdebris slides or avalanches at high elevations and transformed into debris flows which rushed downslope into populated coastal areas. The exceptional storm event induced multiple landslide types which show the relations of...
Conference Paper
Full-text available
In view of the global fossil fuel reserves Underground Coal Gasification (UCG) bears the potential to guarantee long-term energy supply for the future markets by conversion of otherwise non-mineable coal seams. Besides the production of medium to high calorific syngas for various industrial applications (e.g. electricity generation in the frame of...
Conference Paper
Full-text available
Beim maschinellen Tunnelbau kann es beim Durchörtern bindiger Böden oder veränderlich fester Gesteine -insbesondere auch beim Zutritt von Wasser- zu einer Adhäsion bzw. Verklebung des Ausbruchmaterials am Schneidrad oder in den Fördereinrichtungen kommen, die zu weit reichenden Behinderungen im Bauablauf führen kann. In dem Verbundprojekt „InProTun...
Article
Full-text available
A landslide susceptibility analysis was carried out for a tectonically active high mountain region in Kyrgyzstan with data mining methods. A landslide inventory and a factor dataset based on a digital elevation model and a geological map were investigated for patterns and dependencies regarding landslide occurrence using classification algorithms....
Article
Light detection and ranging (LiDAR) technology has been increasingly applied in geotechnical fields because of its high precision, high efficiency, and ease of use. To date, the majority of geotechnical research has focused on external objects. Few studies address internal properties by combining LiDAR with the finite element method (FEM). The curr...
Article
Full-text available
The undrained shear strength of clays is an important geotechnical parameter used during construction processes. Several laboratory tests were performed on kaolinite and smectite mixed with pore fluids with different pH values. Vane shear tests were carried out and it was found that the undrained shear resistance for clays increased considerably if...
Article
Full-text available
Aufgrund der hohen Komplexität und der vielfältigen Vernetzung von Geoprozessen, welche direkt oder indirekt Einfluss auf den Lebensraum des Menschen ausüben, ist der Bedarf an geeigneten und kostengünstigen Um-weltmonitoringsystemen in den letzten Jahren erheblich gestiegen. Trotz der zunehmenden Bedeutung von Mess- und Informationssystemen im Umw...