Handbook of Tunnel Engineering II: Basics and Additional by Bernhard Maidl, Markus Thewes, Ulrich Maidl, David S. Sturge

By Bernhard Maidl, Markus Thewes, Ulrich Maidl, David S. Sturge (Translator)

Tunnel engineering is without doubt one of the oldest, finest but in addition hard engineering disciplines and calls for not just theoretical wisdom but in addition useful event in geology, geomechanics, structural layout, concrete building, computing device expertise, building strategy know-how and development administration. The two-volume "Handbuch des Tunnel- und Stollenbaus" has been the traditional reference paintings for German-speaking tunnellers in conception and perform for 30 years. the recent English variation relies on a revised and tailored model of the 3rd German version and displays the most recent country of data. The ebook is released in volumes, with the second one quantity overlaying either theoretical subject matters like layout fundamentals, geological engineering, structural layout of tunnels and tracking instrumentation, and likewise the sensible facet of labor at the development web site reminiscent of dewatering, waterproofing and scheduling in addition to questions of tendering, award and contracts, info administration and technique controlling. As with quantity I, all chapters comprise sensible examples.

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It has an influence on the size of the final cross-section, also the profile of the excavation and to a certain extent the usable cross-section. The process- and operation-related criteria for the full-face and partial-face excavations are dealt with in Volume 1, Chapter 3. 20 1 General Principles for the Design of the Cross-section Cross-section size. This has to be larger than the minimum profile for economic excavation, which is about 5 m², except when pipe jacking (see Volume I, Chapter 7) is used.

Through cross-passages into the other tunnel bore. to escape and rescue shafts. to escape and rescue tunnels. Cross-passages in this case denote connecting structures between two parallel tunnel bores. They should be closed from each tunnel bore with doors. In two-bore tunnels, every third emergency access to the other bore can be designed to allow passage for fire service and emergency service vehicles in case this is required by the safety and rescue plan. In escape and rescue shafts, escaping people are led up stairs to the open air.

Figure 1-14 Basic crosssection shapes [135]. L. Müller [160] stated the following considerations: “In competent rock, design is relatively unrestricted: cross-sections with vertical sides or flat vaults, even horizontal crowns are possible in stable rock as long as there are not too many joints, such as in conglomerates, some compact limestones and above all in undisturbed granite. Such tunnels are then mostly not lined or only provided with a weak lining. Fully inappropriate are linings, in this case actually only a facing, which are only installed to present a smooth face; underground cavities have their own aesthetics and should be designed according to the character of the rock; there is no reason to coyly hide it.

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