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Parameter Analysis Considering the Impacts of the Support Structure on Ground Settlement and Inner Force During Center Drift Construction
1 College of Resource and Civil Engineering, Northeastern University 2 Liaoning Nonferrous Geological Exploration Research Institute 3 The brancj office of Beijing Urban Construction Design & Development Group Co., Limited
Abstract Considering that the center drift method is widely used in the construction of large-span tunnels and using a subway station utilizing this method in Dalian as an example, the impacts of the longitudinal spacing between two mid-columns, the curvature of the vertical temporary support and the stiffness of the temporary support on tunnel and ground deformations, as well as the inner force transformation of the support, were researched. The results show that: 1) the accumulated ground settlement increases gradually with an increase of mid-column spacing after dismantling the temporary support below the medial plate; 2) the mid-column spacing has more effect on the axial forces of the mid-column and primary lining, but less effect on the bending moment of primary lining; 3) the minimum ground deformation can be obtained using the optimal curvature radius of the vertical temporary support; 4) side drift excavation plays an important role in the inner force transformation of the vertical temporary support; and 5) the stiffness of the temporary support has less effect on the deformations at various points and the final support inner force, but more effect on its own inner force.
Abstract：
Considering that the center drift method is widely used in the construction of large-span tunnels and using a subway station utilizing this method in Dalian as an example, the impacts of the longitudinal spacing between two mid-columns, the curvature of the vertical temporary support and the stiffness of the temporary support on tunnel and ground deformations, as well as the inner force transformation of the support, were researched. The results show that: 1) the accumulated ground settlement increases gradually with an increase of mid-column spacing after dismantling the temporary support below the medial plate; 2) the mid-column spacing has more effect on the axial forces of the mid-column and primary lining, but less effect on the bending moment of primary lining; 3) the minimum ground deformation can be obtained using the optimal curvature radius of the vertical temporary support; 4) side drift excavation plays an important role in the inner force transformation of the vertical temporary support; and 5) the stiffness of the temporary support has less effect on the deformations at various points and the final support inner force, but more effect on its own inner force.
.Parameter Analysis Considering the Impacts of the Support Structure on Ground Settlement and Inner Force During Center Drift Construction[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(2): 59-66
2015, Vol. 52 