Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Considerations on concepts for the design of pressure shafts
The paper is restricted to a steel lined pressure shaft loaded by inner water pressure. The development of stress and displacement of rock mass by excavation, loading and grouting is investigated by using an elastic, symmetrical model. The ultimate loading of the rock mass ring is shown as function of the initial stresses of rock mass and of the crack water pressure and is defined by the acceptable depths of radial fissures. The difference between the ultimate loading and the resistance capability of the rock mass is supported by the steel lining. At increasing inner pressure, this results in smooth transitions from "unlined" shaft to "self-supporting" lining. Rock mass and lining must have equal radial transition at the contact plain. At ultimate loading limited plastic strain in steel is accepted. It is considered that the safety of a steel lined pressure shaft essentially is determined by the uniform elongation and the plastic work capacity of the steel liner. The determination of in-situ stress of rock mass currently is being improved by a parameter study.
Considerations on concepts for the design of pressure shafts
The paper is restricted to a steel lined pressure shaft loaded by inner water pressure. The development of stress and displacement of rock mass by excavation, loading and grouting is investigated by using an elastic, symmetrical model. The ultimate loading of the rock mass ring is shown as function of the initial stresses of rock mass and of the crack water pressure and is defined by the acceptable depths of radial fissures. The difference between the ultimate loading and the resistance capability of the rock mass is supported by the steel lining. At increasing inner pressure, this results in smooth transitions from "unlined" shaft to "self-supporting" lining. Rock mass and lining must have equal radial transition at the contact plain. At ultimate loading limited plastic strain in steel is accepted. It is considered that the safety of a steel lined pressure shaft essentially is determined by the uniform elongation and the plastic work capacity of the steel liner. The determination of in-situ stress of rock mass currently is being improved by a parameter study.
Considerations on concepts for the design of pressure shafts
Innerhofer, G. sen. (Autor:in) / Innerhofer, G. jun. (Autor:in)
2013
10 Seiten, 8 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
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