Search Results - "Thewes, Markus"

Robustness evaluation of cutting tool maintenance planning for soft ground tunneling projects by Conrads, Alena, Scheffer, Markus, König, Markus, Thewes, Markus

“…Tunnel boring machines require extensive maintenance and inspection effort to provide a high availability. The cutting tools of the cutting wheel must be…”
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Investigations on transient support pressure transfer at the tunnel face during slurry shield drive part 1: Case A – Tool cutting depth exceeds shallow slurry penetration depth by Zizka, Zdenek, Schoesser, Britta, Thewes, Markus

“…•Two requirements have to be fulfilled to achieve a stable tunnel face.•The 1st: a sufficient slurry pressure in the excavation chamber.•The 2nd: transfer…”
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Rheological Characterisation of Foam-Conditioned Sands in EPB Tunneling by Galli, Mario, Thewes, Markus

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Investigations on the transient support pressure transfer at the tunnel face during slurry shield drive Part 2: Case B – Deep slurry penetration exceeds tool cutting depth by Zizka, Zdenek, Schoesser, Britta, Thewes, Markus

“…•Two requirements have to be fulfilled to achieve a stable tunnel face.•The 1st: a sufficient slurry pressure in the excavation chamber.•The 2nd: transfer…”
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An experimental study on foam infiltration into saturated sand and its consequence for EPB shield tunneling by Zheng, Dongzhu, Bezuijen, Adam, Thewes, Markus

“…•Drainage behavior is present during the whole foam infiltration process.•The foam spurt period results in a low permeable layer in the sand.•There are two…”
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Application ranges of EPB shields in coarse ground based on laboratory research by Budach, Christoph, Thewes, Markus

“…•Methods to determine the properties of foam are described.•Methods to determine the properties of conditioned soils are presented.•Results on laboratory…”
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Deformational Behaviors of Existing Three-Line Tunnels Induced by Under-Crossing of Three-Line Mechanized Tunnels: A Case Study by Chang, Jiaqi, Thewes, Markus, Zhang, Dongming, Huang, Hongwei, Lin, Wei

“…This research presents monitoring data from a complicated case: the under-crossing of new three-line tunnels beneath existing three-line tunnels. The existing…”
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Data-Based postural prediction of shield tunneling via machine learning with physical information by Chang, Jiaqi, Huang, Hongwei, Thewes, Markus, Zhang, Dongming, Wu, Huiming

“…When applying machine learning algorithms to predict the posture of shield machines during tunneling, the generalization performance of these models might not…”
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Dispersion in slurry shield tunnelling by Weiner, Thorsten, Thewes, Markus

“…In this contribution the relevance of dispersion for tunnel construction will be demonstrated on the basis of project experience and an exemplary economic…”
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Time-dependent material behaviour of shotcrete – New empirical model for the strength development and basic experimental investigations by Hammer, Anna-Lena, Thewes, Markus, Galler, Robert

“…•Time dependency of shotcrete properties is vital due to loading at early stage.•Mechanical properties of shotcrete change continuously during hydration…”
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Parametric study of the impacts of various geological and machine parameters on thrust force requirements for operating a single shield TBM in squeezing ground by Hasanpour, Rohola, Rostami, Jamal, Thewes, Markus, Schmitt, Jürgen

“…Excavation of long tunnels by shielded TBMs is a safe, fast, and efficient method of tunneling that mitigates many risks related to ground conditions. However,…”
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Assessment of clay soils and clay-rich rock for clogging of TBMs by Thewes, Markus, Hollmann, Fritz

“…Shield tunnel drives in both, overconsolidated clays soils and sedimentary rock with clay minerals, frequently suffer extremely from hindrance due to clogging…”
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Face stability analysis of mechanized shield tunneling: An objective systems approach to the problem by Zare Naghadehi, Masoud, Thewes, Markus, Alimardani Lavasan, Arash

“…•An objective system of TBM face stability is developed and quantified.•A new face vulnerability index is introduced for tunnel face stability analysis.•ANN…”
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The study of foaming agent concentration choice in EPB shield soil conditioning by Chen, Zhongtian, Bezuijen, Adam, Fang, Yong, Thewes, Markus, Zheng, Dongzhu

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Residual water content of excavated soil in EPB tunnelling by Galli, Mario, Thewes, Markus, Freimann, Sascha, Schröer, Marius

“…•Not only the foam water but also the residual water is present in the soil matrix.•Water content of excavated soil is a leading parameter for soil…”
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Tender evaluation through efficiency analysis for public construction contracts by Niewerth, Stefan, Vogt, Peter, Thewes, Markus

“…Abstract Given the European Public Procurement Directive 2014/24/EU, policymakers have ordered the inclusion of various criteria, such as the price, life-cycle…”
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Investigations for the application of EPB shields in difficult grounds / Untersuchungen für den Einsatz von Erddruckschilden in schwierigem Baugrund by Galli, Mario, Thewes, Markus

“…As a result of growing urbanisation, subsurface space is developed and has to be expanded. New and bigger tunnels are required to meet the infrastructural…”
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Slurry Shield Tunneling: New Methodology for Simplified Prediction of Increased Pore Pressures Resulting from Slurry Infiltration at the Tunnel Face Under Cyclic Excavation Processes by Zizka, Zdenek, Schoesser, Britta, Thewes, Markus, Schanz, Tom

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Experimental study of foam infiltration from foam-sand mixture into saturated sand for EPB shield tunnelling: A mechanism study by Zheng, Dongzhu, Bezuijen, Adam, Thewes, Markus, Zhang, Qingsong

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New testing method for the prediction of the dispersion of soil in slurry shield tunnelling by Weiner, Thorsten, Thewes, Markus

“…In this contribution, we present a new testing method for the prediction of the dispersion of soil in slurry shield tunnelling. It is based on the proven slake…”
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