Influence of mutual position of a noncircular tunnel and a dynamic impact source on stress distribution in lining

Geodynamics and Stress State of the Earth's Interior 2017

Sammal, A.S.^1 ; Antsiferov, S.V.^1

Tula State University, Tula, Russia^1

关键词: Dynamic impacts;    Maximum stress;    Non-circular;    Non-circular cross-section;    Plane elasticity problems;    Rock mass;    Stress state;    Tunnel cross-section;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/134/1/012054/pdf
DOI  :  10.1088/1755-1315/134/1/012054

来源: IOP

【 摘 要 】

Based on the analytical solution of the corresponding dynamic plane elasticity problem, general regularities of the formation of maximum stresses in lining of a noncircular cross-section tunnel are found and studied at different locations of a dynamic impact source. The paper shows that the closely spaced position of the source has a significant effect on the stress state of the underground structure, which in turn depends on the frequencies of the waves radiated by this source. It is revealed that when the dynamic impact source is removed deep in rock mass for a distance of the order of seven average radii of the tunnel cross section, the estimated stresses in the tunnel lining coincide with the stresses found from the solution of the problem on the wave propagation in the corresponding direction from infinity.