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您的检索式：作者名="Gall Vojtech"
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| 1 | 3D numerical parametric study of the influence of open-pit mining sequence on existing tunnels显示文摘The development of open-pit mines can adversely affect and even damage existing access tunnels. To ensure the safety and serviceability of them, it is essential to know potential adverse effects of the mining sequence on existing tunnels such as displacements of the lining and additional loads on the lining. In this paper, three-dimensional numerical parametric study is performed to explore this complex interaction.This study investigates the effects of different parameters that may affect the tunnel response. These parameters are: excavation sequence method, horizontal/vertical stress ratio, slope angle, and tunnel diameter. This study shows that the mining sequence affects the stability of the tunnels. The open-pit mining activities lead to both higher axial forces in rock bolts and normal forces and bending moments in the lining. The results of the analysis also demonstrate that the mining sequence causes tunnel heave and significant tensile forces in the lining. Based on the study in this paper a better understanding of the interaction between open-pit mining sequence and tunnels will be obtained. | Beyabanaki Amir Reza Gall Vojtech | 2017 | International Journal of Mining Science and Technology2017，27，3： | 8 |
| 2 | A holistic approach for the investigation of lining response to mechanized tunneling induced construction loadings显示文摘Design methods for segmental tunnel linings used in mechanized tunnel constructions typically employ numerical bedded beam mod-els and/or classical analytical solutions for the determination of structural forces(i.e.moments and shear and axial forces)and simple load spreading assumptions for the design of the reinforcement in joint areas.However effcient such methods may be,many physical details are often overlooked and/or oversimplified in the process of reducing the actual structure to a structural beam model,e.g.ana-lytically derived loadings are employed,the grouting and ground reactions are reduced to a spring bedding,and the confinement due to grouting at the longitudinal joint is largely not considered in reinforcement design.Such a design process is not able to account for,or predict,the susceptibility of tunnel linings to often observed damages that,although they may not be structurally relevant,lead to ser-viceability or durability issues,such as crack development or chipping at the segment corners.Numerical methods,such as the Finite Element Method,provide an opportunity to model the segmental tunnel lining and its response to the entire TBM construction process and to explicitly model the crack development within individual segments using modern methods to model the discontinuities in struc-tures.In this contribution,a holistic modeling procedure for the representation of the tunnel lining within the tunneling process is pro-posed and compared to traditional lining models.A 3D process oriented Finite Element model is used to calculate the predicted forces on the tunnel lining and the obtained results are compared with those generated by traditional methods.Subsequently,the predicted defor-mations are then transferred to a detailed segment model in which the nonlinear response of the segment at the longitudinal joint is mod-eled using an interface element based approach to simulate concrete cracking. | Vojtech Ernst Gall Ahmed Marwan Mario Smarslik Markus Obel Peter Mark Gunther Meschke | 2018 | Underground Space2018，3，1： | 0 |
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