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List of products by author: B. Schoesser
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Electrical Resistance Measurements of Materials Relevant in Tunnelling to Detect
Abstract: In slurry shield tunnelling, knowledge of the existing support mechanism at the tunnel face is of great importance. So far, no precise statements can be made about the storage of bentonite particles in the soil structure of soft soil. Geoelectrics offers the possibility to create structural models of soils in real time by determining the electrical resistance of the soil. The electrical...
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Marsh Funnel testing for rheology analysis of bentonite slurries for Slurry Shields
Abstract: For the face support during slurry shield tunnelling, the rheology of the bentonite suspension has to meet strict requirements. Determination of the rheological properties follows the international standards API 13B [1] and DIN 4126 [2]. On the construction site, simple and robust measurement methods are required for quality control of the suspension parameters during the tunnelling process....
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Potential of the newly developed High Density Support Medium (HDSM) for the application of Variable Density (VD)-TBM...
Abstract: On their first application for the Klang Valley MRT-Project in Kuala Lumpur, the Variable Density (VD)-TBMs had to bore through very karstic limestone in mixed face conditions with hard rock and soft ground. This type of TBM technology was also applied for other tunnelling projects with highly heterogeneous, very coarse and permeable ground in some instances under a high ground water level....
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Recommendations for Efficient Face Support in Slurry Shield Tunnelling
Abstract: In slurry shield tunnelling, a reliable face support is presumed if a support pressure is transferred and the slurry excess pressure provides efficient support pressure on the soil skeleton. To ensure face stability, the support pressure transfer needs to be provided within the theoretical sliding wedge after Horn (1961) at the tunnel face. Therefore, the penetration depth of the bentonite...
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Separation of used bentonite suspensions in slurry shield tunneling: improvement of depositing costs by introduction...
Abstract: High costs and ecological impacts of separation and disposal of used bentonite suspen-sions are driving forces of the operating efficiency of slurry shield tunneling. This paper introduces a new method for improvement of the conventional separation processes by means of electrocoagulation. This method is based on the physical principles of electrolysis and consists of applying electrical...
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