Stress safety inspection scheme for center diaphragm structure of shallow-buried ultra-large-span tunnel

Abstract

The invention discloses a stress safety inspection scheme for the center diaphragm structure of a shallow-buried ultra-large-span tunnel. The scheme comprises the steps of: establishing a pilot upperstep center diaphragm mechanical model; calculating the unit displacement and load displacement of the skewbacks of a side wall steel frame and the center diaphragm; calculating the displacement of the skewbacks of the steel frame of the pilot upper step mechanical model; calculating displacement generated in the direction of a structural internal force; establishing a side wall steel frame-centerdiaphragm structure displacement coordination equation; calculating the structural internal force; and check and inspecting stress safety; and other steps. According to the stress safety inspection scheme of the invention, on the basis of the specific conditions of a support and the center diaphragm structure during the primary stage of the construction of the ultra-large-span tunnel, a supporting system is equivalent to a three-fold statically indeterminate hingeless arch-beam rigid fixed connection structure with a movable seat; a pilot upper step side wall steel frame-center diaphragm common bearing displacement mechanical calculation analysis model is established, so that the actual condition of the construction of the tunnel is accurately reflected.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction in civil engineering, and in particular relates to a force safety inspection scheme for a partition wall structure in a shallow-buried super-long-span tunnel. Background technique [0002] In recent years, with the rapid development of the national economy and the rapid growth of traffic volume, the number of motor vehicles has continued to increase. In economically developed areas and peri-urban areas, the traffic volume has become increasingly saturated, and traffic congestion has seriously restricted the development of highway traffic. Considering the non-renewability and irreversibility of tunnel corridors, a large number of single-hole four-lane tunnel projects have emerged in new construction, reconstruction and expansion projects of expressways. At this stage, there are not many single-hole four-lane ultra-long-span flat highway tunnel engineering practices in my country, and th...

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Problems solved by technology

In the past, the research on the mechanical properties of the middle partition mostly used numerical simulation and on-site monitoring. The mechanical model of the middle partition structure was too simplified and rough, and did not consider the deformation coordination between the steel frame of the side wall and the middle partition and the arch foot of the steel frame. The displacement of the joints cannot truly reflect the load-bearing mode and mechanism of the support structure during the construction process, and the stress on the joints and the middle partition is still unclear

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