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List of products by author: L. Langmaack
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EPB tunnelling in hard rock conditions and transition zones
Abstract: Various TBM projects around the world are digging in predominantly hard rock conditions – facing difficulties when weathered rock or even soft ground zones penetrate the tunnel profile. To tunnel through these „weak zones”, like in Oslo centre, is a risk to the environment and causes high costs for treating the soil or additional measures if not handled properly. So far, only one TBM project...
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How to protect our Nature - Chemistry in TBM tunnelling. From the laboratory to on-site use and muck disposal
Abstract: All tunnelling methods need chemical additives - modern tunnel construction without chemicals is utterly impossible. When using chemicals, it is important to investigate not only their efficiency but also their environmental impacts – which mean they shall be carefully selected. Technically perfect products are not necessarily a good choice for the environment. Health & environmental...
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Metro Kuala Lumpur – The Chemical Contribution
Abstract: Malaysia’s first Mass Rapid Transit (MRT) project was officially launched on July 8 2011. The total length of 51km stretches across Klang Valley, 9.5km running underground with 7 stations across the busiest city center of Kuala Lumpur. MRT is expected to be in operation by end of 2016. The project was awarded to MMC Gamuda KVMRT (T) Sdn Bhd. The geological conditions of the Klang Valley makes...
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Proposed Methodology for Clogging Evaluation in EPB Machines
Abstract: Clogging occurrence has long been an issue for EPB drives, through not only pure clay soils, but also in mixed soils with sufficient clay content for clogging to happen. It occurs when clay particles adhere to metal surfaces of excavation tools because of the attractive forces of the clay particles and the presence of water between the clay-metal surface. The occurrence of clogging in Earth...
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Soil Conditioning with Artificial Soil and Foam in EPB-Tunneling
Abstract: In mechanised tunnelling with EPB-shields operating in closed mode, the excavated soil is used as support medium in order to assure a sufficient stabilisation of the tunnel face. Coarse grained or high permeable soils doesn’t exhibit adequate conditions to be used as a support medium in an EPB shield, which require the increase of cohesion and plastic behaviour of the excavated soil. In this...
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