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《Chinese Journal of Rock Mechanics and Engineering》 1982-01
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The Mechanical Problems for the Long-term Stability of Underground Galleries

Tan Tjongkie(Institute of Geophysics, Academia Sinica Beijing)  
The formation of Jinchuan ore body is analysed on the base of the geody-namics of the China plate. Due to this formation under high stresses and tem-peratures and later subsequent tectonic activity residual tectonic stresses mustbe still an active suspection of the galleries show that the considerable conver-gence of the tunnel boundaries are closely related to the complex geological struc-ture. These motions are further ascribed to: (1) Lateral creep due to normal stresses acting around the galleries; (2) Libration of accumulated elastic energy, which is known as elastic re-covery; (3)Time-dependent dilatancy and swelling; (4)Sliding of plastic wedges along gliding planes. It is pointed that under the action of tectonic forces, stresses are concen-trated along the bottom and roof Hence a concrete bottom arch or slab is urgent-ly needed. Further it is stressed that water is a crucial factor in the swellingof the rock and the instabilities of the tunnel Water must be prevented as effi-ciently as possible to enter into the fissure within the rock. On the base of theabove reasoning some principles are suggested for the design of the lining andthe reinforcement of the tunnel. A lining with defromable joints especially forlarger overburdens is recommended.
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