Three-way loading mechanical property test system of multifunctional lining segment joint

Abstract

The invention provides a three-way loading mechanical property test system of a multifunctional lining segment joint, which mainly comprises a self-balancing frame sub-system, a loading sub-system, a test-piece support sub-system, a test-piece transporting sub-system, a loading control sub-system and a data acquisition sub-system. The loading sub-system adopts a modular design and can finish a shield tunneling lining segment inter-ring shearing test, a bending moment transferring test, a longitudinal joint corner rigidity test, a longitudinal joint radial shearing test and the like by different combinations. The system of the invention can preferably imitate three-way stress states of the shield tunneling lining segment joint in actual conditions and can finish various different loading modes to obtain mechanical parameters of the shield tunneling lining segment joint and mechanical properties of other similar structures.

Description

technical field [0001] The invention relates to a test device, in particular to a device for performing a mechanical performance test on a shield tunnel lining segment joint. Background technique [0002] As a special underground structure, the shield tunnel has the following characteristics compared with the above-ground structure and other underground structures when studying its mechanical properties: 1) There is interaction between the shield tunnel and the surrounding soil, so the shield tunnel The stress on the lining segment is relatively complex and the loads received at different stages and positions are different; 2) The actual load acting on the lining segment of the shield tunnel is simplified to the longitudinal force and the axial force and bending moment along the ring direction. Therefore, the actual 3) The shield tunnel lining adopts the segment assembly method, and the segment joint structure is relatively complex, so its mechanical properties are relativel...

AI Technical Summary

Problems solved by technology

As far as we know, the test of the mechanical properties of joints is mainly to obtain the bending stiffness of the longitudinal joint, so the test equipment can only apply axial force and bending moment

And the test framework is relatively simple, and the loading control system is relatively low-level

In addition, the test of mechanical properties of this kind of joint cannot be used to test the shear stiffness and moment transfer coefficient between segment rings in the case of staggered assembly.

The full-ring test can measure the deformation and internal force of the segment ring under the design load, and can also test the interaction between the segment rings under the condition of staggered joint assembly. However, due to the large volume of the prototype full-ring test, The test loading system is relatively complex and can easily cause errors, so the test results of some key design parameters are often unreasonable

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