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Schmale Gräben - Herstellung und Tragwirkung. Geotechnical Innovations. Brinkgreve, Schad, Schweiger (eds.). VGE, Essen,(2004), pp.255-294
Prof. Dr.-Ing. Hans-Henning Schmidt, Dr.-Ing. Thomas Rumpelt
10.12.04
ABSTRACT

The preliminary findings of a cooperative research and development project on practical and design aspects of narrow pipeline trenches involving several German cities and government agencies as well as corresponding European partners are presented in this paper. The different methods of constructing trenches, particularly in the vicinity of urban trafficways and their effect on the serviceabilty as well as contractural issues involving quality control are described and assessed. Particular attention is drawn to the design of the pipe embedment zone, the compaction requirements and their control in this area as well as the backfill zone, consisting in the Southern German context chiefly of cohesive soils with or without soil improvement. Methods of performing quick quality control tests in the trench backfill, such as the dynamic plate load test, dynamic soundings, the dynamic CBR test and the Clegg-Impact-Soil-Tester are described and evaluated, particularly with respect to existing and still needed correlations. The effects of arching in narrow trenches were investigated in finite element analyses, which yielded the expected result that narrow trenches exhibit a greater affinity for load carrying capacity, raising – in view of the economic implications - the question of the necessary standards applicable to the compaction of narrow trenches.