Tunnel lining structure uniform load test system and sealing method thereof

Abstract

The invention discloses a tunnel lining structure uniform load test system and a sealing method thereof. The tunnel lining structure uniform load test system comprises a pressurizing system, a model box and a tunnel lining arranged in the model box, the pressurizing system is a steel frame pressurizing system and mainly comprises a side beam, a top beam and an oil cylinder, the model box comprises six panels and a force transferring plate, a pulley is arranged at the bottom of the force transferring plate, the tunnel lining is arranged in the model box, the space between the model box and the tunnel lining is filled with water, oil or lubricating grease, the model box is a sealed model box, a force transferring medium is changed, so that the sealing performance of the model box is improved, approximate uniform pressurizing at the back of the lining can be realized, load pressure at the back of the lining can be directly controlled, a large-scale similar model test can be realized, and the tunnel lining structure uniform load test system can be used for researching distress tunnel lining structure carrying performance, a lining crack expanding test and a large-scale flexible stabilization (carbon fibers and steel belt) test in tunnel lining carrying performance and structural design and operation.

Description

technical field [0001] The invention belongs to the field of tunnel engineering, and in particular relates to a tunnel lining structure uniformly distributed loading test system and a sealing method thereof. Background technique [0002] The tunnel bearing performance test is a process of testing and evaluating the bearing performance of the tunnel lining. The specific method is to take the tunnel lining and surrounding rocks 3 to 5 times the diameter of the tunnel as the research object, and place them in a rectangular model box; use the ground stress as the boundary pressure to load on the boundary of the model box, and the pressure first acts on the surrounding rock. On the rock, the shear stress and anisotropic normal stress generated in the surrounding rock are transmitted to the tunnel lining to make it loaded; the boundary pressure is loaded step by step until the tunnel lining is destroyed. [0003] The test process in the prior art mainly has the following deficien...

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Problems solved by technology

[0006] (3) The surrounding rock is a high-friction, rock-like elastic-plastic material. After entering the high-pressure stage, the pressure transmitted to the back of the tunnel lining is uncontrollable and unknown in advance. Because of its clothability, it is impossible to accurately evaluate the overall load-carrying performance of the tunnel lining and its overall stiffness change;

[0007] (4) When different surrounding rock materials are used, the axial force and bending moment generated inside the same tunnel lining are different in size and in different locations, so the overall bearing performance is inconsistent, and it is impossible to evaluate the bearing performance of the tunnel lining in operation;

[0009] (6) The scale is small, and the span of similar models of tunnel lining is generally 0.4-0.6m. It is difficult to carry out reinforcement tests on damaged tunnel linings, such as reinforcement methods such as internally pasting elastic fibers and internally pasting steel belts; it is difficult to observe experimental phenomena, such as crack expansion and Therefore, it is impossible to scientifically evaluate the effect of improving the load-bearing performance of the damaged tunnel lining in operation after being reinforced.

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