Applicability of finger jointing to circular laminated veneer hollow sections for temporary soil nailing
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ORIGINAL
Applicability of finger jointing to circular laminated veneer hollow sections for temporary soil nailing Sebastian Hirschmüller1 · Roman Marte2 · Alexander Englberger1 Received: 16 September 2019 © The Author(s) 2020
Abstract This paper investigates the strength properties of circular laminated veneer lumber hollow sections made of beech wood and loaded in tension. These tubular, hollow wooden poles are intended for an innovative geotechnical approach, which utilizes the high tensile strength of beech wood and its limited durability as soil nails for temporary geotechnical slope stabilisation. Due to the standardized design approaches of soil nail walls that prevent a rigid soil body from sliding by using nails as reinforcement elements, primary tension loads will be aligned to the structural elements. Depending on the height of the soil nail wall, nails with a length up to 10 m may be necessary, demanding for high-performance longitudinal section joints due to the natural length limitations of the wood veneer. This paper discusses the applicability of finger jointing to tubular, laminated beech wood veneer poles and presents the results of large-scale tensile tests. Depending on the joint arrangement, the median tensile strength is reduced by 37–43% compared to the unjointed sections of a similar geometry. Thus, finger jointing has been found to be an efficient method of a longitudinal load-carrying connection in combination with a minimized cross section reduction at the joint. However, due to the low sample size of the tests, further improvements are necessary.
1 Introduction 1.1 Geotechnical background Currently, soil nailing is a common way of slope stabilization in foundation engineering. Therefore, steel anchors are drilled into the soil and a reinforced shotcrete layer protects the slope surface. The gap around the steel rod is filled with cement grout. The hardened cement body ensures the necessary connection (force closure) between soil and anchor. For the temporary stabilisation of construction pit slopes, soil nailing systems are usually used. In case of temporary soil nailing systems, the construction has a reduced service * Sebastian Hirschmüller sebastian.hirschmueller@th‑rosenheim.de Roman Marte [email protected] Alexander Englberger alexander.englberger@th‑rosenheim.de 1
Department of Research and Development, University of Applied Sciences Rosenheim, Rosenheim, Germany
Institute of Soil Mechanics, Foundation Engineering and Computational Geotechnics, Graz University of Technology, Graz, Austria
2
life of 2 years maximum. Thereafter, the anchors have no structural use, but usually remain in the soil, because it is generally not possible to remove them due to their limited accessibility after installation. The objective of this research topic is to replace the temporary steel nails in cut slopes reinforced with circular laminated hollow sections CLHS (Fig. 1) from European beech (Fagus sylvatica L.). The motivation is to develop a sustainable soil nailing system for temp
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