Earth pressure load determination method of deeply-buried asymmetric multiple-arch tunnel

Abstract

The invention provides an earth pressure load determination method of a deeply-buried asymmetric multiple-arch tunnel. The asymmetric multiple-arch tunnel has the mechanical characteristics that the geometry and structure modes are asymmetric, the excavation span is large, the construction processes are various, the structure stress is complex, etc. In supporting structure design, load-structure model checking computations are usually needed, and no mature calculation method is available for load determination. At the background, the asymmetric condition of the geometry and structure modes of left and right tunnel chambers is considered, and based on the basic assumption of two slumping arches of the multiple-arch tunnel, and earth pressure load calculating formulas of the deeply-buried asymmetric multiple-arch tunnel are derived according to Pu's theory. If the a symmetric condition is given to the derived formulas, the derived formulas can be degenerated to the calculating formulas of a normal multiple-arch tunnel, so that the accuracy of the derived formulas is verified; and finally, combined with engineering cases, the rationality of the derived formulas is verified. The research method and conclusion can provided important references for the determination of a design load of the deeply-buried asymmetric multiple-arch tunnel.

Description

technical field [0001] The invention relates to the technical field of support structure design of multi-arch tunnels, in particular to a method for determining earth pressure loads of deeply buried asymmetric multi-arch tunnels. Background technique [0002] Since the reform and opening up, with the rapid development of the national economy, the continuous advancement of the urbanization process and the successful implementation of the strategic decision of the Western Development, my country's urban road network and inter-city expressway network are forming, urban underground road projects and mountain-crossing roads Tunneling projects keep popping up. In view of the constraints of highway alignment and terrain conditions, some tunnels have to adopt the form of multi-arch structure, and asymmetric multi-arch tunnel is a special structural form under special conditions. In addition to the general characteristics of multi-arch tunnels such as complex structural stress, numer...

AI Technical Summary

Problems solved by technology

Ding Wenqi et al. proposed a load calculation formula for multi-arch tunnels based on the theory of double-slump arches on the basis of the standard single-cavity tunnel load calculation formula, creating a precedent for the calculation method of earth pressure loads for multi-arch tunnels, but the disadvantages of this method are The pre-support function of the partition wall cannot be fully considered

However, these research results are mainly aimed at symmetrical multi-arch tunnels, and cannot be directly applied to asymmetrical cases.

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