Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Stability of Shallow Tunnels and Underground Openings in Cohesive Material
The construction of a shallow tunnel in soft ground can be idealized by the excavation of an underground cavity which is supported by a fluid pressure (due to compressed air or pressurized slurry). If this pressure is too small then the tunnel heading will be unstable and soil will collapse inwards. Undrained stability solutions are presented using the bound theorems of plasticity for three heading geometries which are relevant to shallow tunnelling and mining situations. The three cases are those of a long unlined cylindrical cavity, a long wall mining excavation and a cylindrical cavity lined up to the face. It is demonstrated that a simple stability criterion which has been previously used by tunnelling engineers is sometimes unsafe and sometimes conservative. Solutions are also presented for cases when failure is caused by a tunnel pressure which is too high (blow-out) and when collapse is inevitable whatever uniform fluid pressure is applied in the cavity. The theoretical solutions are in good agreement with the experimental evidence currently available.
Stability of Shallow Tunnels and Underground Openings in Cohesive Material
The construction of a shallow tunnel in soft ground can be idealized by the excavation of an underground cavity which is supported by a fluid pressure (due to compressed air or pressurized slurry). If this pressure is too small then the tunnel heading will be unstable and soil will collapse inwards. Undrained stability solutions are presented using the bound theorems of plasticity for three heading geometries which are relevant to shallow tunnelling and mining situations. The three cases are those of a long unlined cylindrical cavity, a long wall mining excavation and a cylindrical cavity lined up to the face. It is demonstrated that a simple stability criterion which has been previously used by tunnelling engineers is sometimes unsafe and sometimes conservative. Solutions are also presented for cases when failure is caused by a tunnel pressure which is too high (blow-out) and when collapse is inevitable whatever uniform fluid pressure is applied in the cavity. The theoretical solutions are in good agreement with the experimental evidence currently available.
Stability of Shallow Tunnels and Underground Openings in Cohesive Material
E. H. Davis (Autor:in) / M. J. Gunn (Autor:in) / R. J. Mair (Autor:in) / H. N. Seneviratne (Autor:in)
1980
47 pages
Report
Keine Angabe
Englisch
| British Library Online Contents | 2017
Instrumentation in Tunnels and Large Underground Openings
| British Library Conference Proceedings | 1999