Standing type mechanical loading device for three-ring prototype irregular shield segment

Abstract

The invention provides a standing type mechanical loading device for a three-ring prototype irregular shield segment. The device comprises a full-steel loading reaction frame, a loading system, a control system and a testing shield segment; the full-steel loading reaction frame is positioned by a vertical standing manner; three-ring segments which are spliced into rings are vertically positioned in the full-steel loading reaction frame by a standing manner; a top plate and two sides of each segment are loaded through annular jacks which are fixed into reserved holes in the full-steel loading reaction frame; the actual pressure value of water and soil on each sectional segment is respectively calculated under the condition that the ground reaction pressure is considered; the load is applied to a center point of the arc length of an outer arc-shaped surface of the sectional segment long the outer arc-shaped surface of each segment in the radial direction through the annular jacks; a bottom plate of each segment that the segment independently balances the force borne through a liquid bag; a propping and pushing force applied to each segment during excavating a shield is simulated through a longitudinal pulling rod system; the control system comprises a jack oil pressure control system and a liquid bag water pressure control system. With the adoption of the device, the mechanical behavior characteristics of the segments under different stratum conditions can be really simulated, so that the basis is provided for the design of the irregular shield segment and the construction of an irregular shield tunnel, and the test result meets the objective fact.

Description

technical field [0001] The invention relates to a mechanical test loading device for a special-shaped shield segment, in particular to a standing three-ring prototype special-shaped shield segment mechanical loading device, which belongs to the technical field of tunnel engineering. Background technique [0002] The shield segment is an important part of the tunnel structure and bears the water and soil pressure of the surrounding strata. The experimental research on shield segment at home and abroad can be divided into four categories: indoor model test, mechanical test of single shield segment and joint, field test of shield segment and mechanical loading test of prototype shield segment. However, although the first three types of segment test research methods have certain scientific and engineering value in exploring and studying the mechanical properties and deformation and failure modes of segment structures, there are still many deficiencies and limitations, mainly ref...

AI Technical Summary

Problems solved by technology

[0007] However, the calculation method of the load on the segment and the method of applying the test load are different for different full-ring segment tests

First of all, the existing segment mechanical tests are all placed in a flat position, regardless of the self-weight of the segment and the boundary conditions at the bottom of the segment

Secondly, due to the self-balancing of the segment test, almost all the test loads are in the form of radial symmetry, and the trapezoidal distribution of the load on both sides of the segment as the depth increases cannot be avoided.

Furthermore, under different segment mechanical test conditions, the force of the segment can only focus on the stress of a few key parts to approach the actual force, and cannot achieve a full approach to the force of the real segment.

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